Hangs when using musl libc

[leahneukirchen]

When using halfempty 0.40 on Linux 5.9.8/musl 1.1.24/glib 2.66.2 from Void Linux, the test suite gets stuck, e.g. on the grep example.

Valgrind shows that close(-1) is executed, which points me to cleanup_orphaned_tasks.

Sample run with debugging output (limited to one thread for clarity):

G_MESSAGES_DEBUG=all ../halfempty -P 1 --cleanup-threads=1 grep.sh grep.in

$ G_MESSAGES_DEBUG=all ../halfempty -P 1 --cleanup-threads=1 grep.sh grep.in
** (process:18916): DEBUG: 22:49:07.296: configuring default rlimits for child process
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_CPU => { 18446744073709551615, 18446744073709551615 }
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_FSIZE => { 18446744073709551615, 18446744073709551615 }
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_DATA => { 18446744073709551615, 18446744073709551615 }
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_STACK => { 8388608, 18446744073709551615 }
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_CORE => { 0, 18446744073709551615 }
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_RSS => { 18446744073709551615, 18446744073709551615 }
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_NPROC => { 62081, 62081 }
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_NOFILE => { 4096, 4096 }
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_MEMLOCK => { 65536, 65536 }
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_AS => { 18446744073709551615, 18446744073709551615 }
** (process:18916): DEBUG: 22:49:07.296: Configured rlimit RLIMIT_LOCKS => { 18446744073709551615, 18446744073709551615 }
** (process:18916): DEBUG: 22:49:07.297: Configured rlimit RLIMIT_SIGPENDING => { 62081, 62081 }
** (process:18916): DEBUG: 22:49:07.297: Configured rlimit RLIMIT_MSGQUEUE => { 819200, 819200 }
** (process:18916): DEBUG: 22:49:07.297: Configured rlimit RLIMIT_NICE => { 0, 0 }
** (process:18916): DEBUG: 22:49:07.297: Configured rlimit RLIMIT_RTPRIO => { 0, 0 }
** INFO: 22:49:07.297: Initializing 2 strategies...
** INFO: 22:49:07.297: Strategy 1: "bisect", Remove consecutively larger chunks of data from the file
** INFO: 22:49:07.297: Strategy 2: "zero", Zero consecutively larger chunks of data from the file
╭│   │ ── halfempty ───────────────────────────────────────────────── v0.40 ──
╰│  8│ A fast, parallel testcase minimization tool
 ╰───╯ ───────────────────────────────────────────────────────── by @taviso ──

Input file "grep.in" is now 1191359 bytes, starting strategy "bisect"...
Verifying the original input executes successfully... (skip with --noverify)
** (halfempty:18916): DEBUG: 22:49:07.298: thread 0x55b2a74dce60 processing task 0x55b2a74dcce0, size 1191359, fd 3, status TASK_STATUS_PENDING
** (halfempty:18916): DEBUG: 22:49:07.299: writing data to child 18918 pipefd=5
** (halfempty:18916): DEBUG: 22:49:07.302: Broken pipe received from 18916
** (halfempty:18916): DEBUG: 22:49:07.302: failed to splice all data into pipe, 1191359 remaining
** (halfempty:18916): DEBUG: 22:49:07.302: finished writing data to child, about to waitid(18918)
** (halfempty:18916): DEBUG: 22:49:07.302: child 18918 exited with code 0
** (halfempty:18916): DEBUG: 22:49:07.302: thread 0x55b2a74dce60, child returned 0 after 0.004 seconds, size 1191359
** (halfempty:18916): DEBUG: 22:49:07.302: task 0x55b2a74dcce0 success, aborting mispredicted jobs
** (halfempty:18916): DEBUG: 22:49:07.302: abort_pending_tasks() called, but no child nodes to traverse
** INFO: 22:49:07.302: thread 0x55b2a74dce60 found task 0x55b2a74dcce0 succeeded after 0.004 seconds, size 1191359, depth 1
** (halfempty:18916): DEBUG: 22:49:07.302: thread 0x55b2a74dce60 completed workunit 0x55b2a74dcce0
The original input file succeeded after 0.0 seconds.
(halfempty:18916): bisect-DEBUG: 22:49:07.303: strategy_bisect_data(0x55b2a74dce00)
(halfempty:18916): bisect-DEBUG: 22:49:07.303: initializing a new root node size 1191359
** (halfempty:18916): DEBUG: 22:49:07.303: generator thread obtained treelock, finding next leaf
New finalized size: 1191359 (depth=2) real=0.0s, user=0.0s, speedup=~-0.0s
** (halfempty:18916): DEBUG: 22:49:07.303: found a TASK_STATUS_SUCCESS task, size 1191359 
(halfempty:18916): bisect-DEBUG: 22:49:07.303: strategy_bisect_data(0x55b2a74dce00)
(halfempty:18916): bisect-DEBUG: 22:49:07.303: parent succeeded, not incrementing offset from 0
(halfempty:18916): bisect-DEBUG: 22:49:07.303: creating task for 0x55b2a74dce00 with parent 0x55b2a74dcce0 and source 0x55b2a74dcce0
** (halfempty:18916): DEBUG: 22:49:07.303: node is a leaf node, generating children
** (halfempty:18916): DEBUG: 22:49:07.303: generator thread releasing tree lock
** (halfempty:18916): DEBUG: 22:49:07.303: generator thread obtained treelock, finding next leaf
** (halfempty:18916): DEBUG: 22:49:07.303: thread 0x7f7c167af460 processing task 0x55b2a74dd940, size 0, fd 4, status TASK_STATUS_PENDING
** (halfempty:18916): DEBUG: 22:49:07.304: found a TASK_STATUS_SUCCESS task, size 1191359 
** (halfempty:18916): DEBUG: 22:49:07.304: node is not a leaf, traversing
** (halfempty:18916): DEBUG: 22:49:07.304:  found a TASK_STATUS_PENDING task, size 0 
(halfempty:18916): bisect-DEBUG: 22:49:07.304: strategy_bisect_data(0x55b2a74dcec0)
bisect-INFO: 22:49:07.304: reached end of cycle (offset 0 + chunksize 1191359 > size 0)
(halfempty:18916): bisect-DEBUG: 22:49:07.304: creating task for 0x55b2a74dcec0 with parent 0x55b2a74dd940 and source 0x55b2a74dcce0
** (halfempty:18916): DEBUG: 22:49:07.305: writing data to child 18920 pipefd=6
** (halfempty:18916): DEBUG: 22:49:07.305: finished writing data to child, about to waitid(18920)
** (halfempty:18916): DEBUG: 22:49:07.307: child 18920 exited with code 1
** (halfempty:18916): DEBUG: 22:49:07.307: thread 0x7f7c167af460, child returned 1 after 0.004 seconds, size 0
** (halfempty:18916): DEBUG: 22:49:07.307: task 0x55b2a74dd940 failed, fd 4, pid 18920
** (halfempty:18916): DEBUG: 22:49:07.308: thread 0x7f7c167af460 completed workunit 0x55b2a74dd940
** (halfempty:18916): DEBUG: 22:49:07.308: thread 0x7f7c166826a0 cleaning up task 0x55b2a74dd940 (pid=18920), now attempting to lock
** (halfempty:18916): DEBUG: 22:49:07.308: thread 0x7f7c166826a0 acquired lock on task 0x55b2a74dd940, state TASK_STATUS_FAILURE
** (halfempty:18916): DEBUG: 22:49:07.308: task 0x55b2a74dd940 unlocked by 0x7f7c166826a0, now discarded
** (halfempty:18916): DEBUG: 22:49:07.311:  node is a leaf node, generating children
** (halfempty:18916): DEBUG: 22:49:07.311: generator thread releasing tree lock
** (halfempty:18916): DEBUG: 22:49:07.311: generator thread obtained treelock, finding next leaf
** (halfempty:18916): DEBUG: 22:49:07.311: thread 0x7f7c167af460 processing task 0x55b2a74dd9a0, size 595680, fd 8, status TASK_STATUS_PENDING
** (halfempty:18916): DEBUG: 22:49:07.312: found a TASK_STATUS_SUCCESS task, size 1191359 
** (halfempty:18916): DEBUG: 22:49:07.312: node is not a leaf, traversing
** (halfempty:18916): DEBUG: 22:49:07.312:  found a TASK_STATUS_FAILURE task, size 0 
** (halfempty:18916): DEBUG: 22:49:07.312:  node is not a leaf, traversing
** (halfempty:18916): DEBUG: 22:49:07.312:   found a TASK_STATUS_PENDING task, size 595680 
(halfempty:18916): bisect-DEBUG: 22:49:07.313: strategy_bisect_data(0x55b2a74dcef0)
(halfempty:18916): bisect-DEBUG: 22:49:07.313: parent failed or pending, trying next offset 0 => 595679
(halfempty:18916): bisect-DEBUG: 22:49:07.313: creating task for 0x55b2a74dcef0 with parent 0x55b2a74dd9a0 and source 0x55b2a74dcce0
** (halfempty:18916): DEBUG: 22:49:07.322:   node is a leaf node, generating children
** (halfempty:18916): DEBUG: 22:49:07.322: generator thread releasing tree lock
** (halfempty:18916): DEBUG: 22:49:07.322: generator thread obtained treelock, finding next leaf
** (halfempty:18916): DEBUG: 22:49:07.322: found a TASK_STATUS_SUCCESS task, size 1191359 
** (halfempty:18916): DEBUG: 22:49:07.322: node is not a leaf, traversing
** (halfempty:18916): DEBUG: 22:49:07.322:  found a TASK_STATUS_FAILURE task, size 0 
** (halfempty:18916): DEBUG: 22:49:07.322:  node is not a leaf, traversing
** (halfempty:18916): DEBUG: 22:49:07.322:   found a TASK_STATUS_PENDING task, size 595680 
** (halfempty:18916): DEBUG: 22:49:07.322:   node is not a leaf, traversing
** (halfempty:18916): DEBUG: 22:49:07.322:    found a TASK_STATUS_PENDING task, size 595680 
(halfempty:18916): bisect-DEBUG: 22:49:07.323: strategy_bisect_data(0x55b2a74dcf50)
bisect-INFO: 22:49:07.323: reached end of cycle (offset 595679 + chunksize 595679 > size 595680)
(halfempty:18916): bisect-DEBUG: 22:49:07.323: creating task for 0x55b2a74dcf50 with parent 0x55b2a74e1300 and source 0x55b2a74dcce0
** (halfempty:18916): DEBUG: 22:49:07.333:    node is a leaf node, generating children
** (halfempty:18916): DEBUG: 22:49:07.333: generator thread releasing tree lock
** (halfempty:18916): DEBUG: 22:49:07.333: generator thread obtained treelock, finding next leaf
** (halfempty:18916): DEBUG: 22:49:07.333: found a TASK_STATUS_SUCCESS task, size 1191359 
** (halfempty:18916): DEBUG: 22:49:07.333: node is not a leaf, traversing
** (halfempty:18916): DEBUG: 22:49:07.333:  found a TASK_STATUS_FAILURE task, size 0 
** (halfempty:18916): DEBUG: 22:49:07.334:  node is not a leaf, traversing
** (halfempty:18916): DEBUG: 22:49:07.334:   found a TASK_STATUS_PENDING task, size 595680 
** (halfempty:18916): DEBUG: 22:49:07.334:   node is not a leaf, traversing
** (halfempty:18916): DEBUG: 22:49:07.334:    found a TASK_STATUS_PENDING task, size 595680 
** (halfempty:18916): DEBUG: 22:49:07.334:    node is not a leaf, traversing
** (halfempty:18916): DEBUG: 22:49:07.334:     found a TASK_STATUS_PENDING task, size 893520 
(halfempty:18916): bisect-DEBUG: 22:49:07.334: strategy_bisect_data(0x55b2a74dd210)
(halfempty:18916): bisect-DEBUG: 22:49:07.334: parent failed or pending, trying next offset 0 => 297839
(halfempty:18916): bisect-DEBUG: 22:49:07.334: creating task for 0x55b2a74dd210 with parent 0x55b2a74e1360 and source 0x55b2a74dcce0
** (halfempty:18916): DEBUG: 22:49:07.339:     node is a leaf node, generating children
** (halfempty:18916): DEBUG: 22:49:07.339: generator thread releasing tree lock

Interestingly, under valgrind it manages to finish, but does these invalid close calls (which also seem to occur on glibc!):

valgrind ../halfempty -P 1 --cleanup-threads=1 grep.sh grep.in

valgrind ../halfempty -P 1 --cleanup-threads=1 grep.sh grep.in
==19081== Memcheck, a memory error detector
==19081== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==19081== Using Valgrind-3.16.1 and LibVEX; rerun with -h for copyright info
==19081== Command: ../halfempty -P 1 --cleanup-threads=1 grep.sh grep.in
==19081== 
╭│   │ ── halfempty ───────────────────────────────────────────────── v0.40 ──
╰│  8│ A fast, parallel testcase minimization tool
 ╰───╯ ───────────────────────────────────────────────────────── by @taviso ──

Input file "grep.in" is now 1191359 bytes, starting strategy "bisect"...
--19081-- WARNING: unhandled amd64-linux syscall: 315
--19081-- You may be able to write your own handler.
--19081-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--19081-- Nevertheless we consider this a bug.  Please report
--19081-- it at http://valgrind.org/support/bug_reports.html.
Verifying the original input executes successfully... (skip with --noverify)
The original input file succeeded after 0.0 seconds.
New finalized size: 1191359 (depth=2) real=0.0s, user=0.0s, speedup=~-0.0s
New finalized size: 595680 (depth=5) real=0.1s, user=0.0s, speedup=~-0.0s
New finalized size: 297841 (depth=7) real=0.1s, user=0.1s, speedup=~-0.0s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 148922 (depth=9) real=0.2s, user=0.1s, speedup=~-0.1s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 74463 (depth=11) real=0.3s, user=0.1s, speedup=~-0.1s
New finalized size: 37234 (depth=13) real=0.3s, user=0.2s, speedup=~-0.1s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 18620 (depth=14) real=0.4s, user=0.2s, speedup=~-0.2s
New finalized size: 9313 (depth=17) real=0.5s, user=0.2s, speedup=~-0.2s
New finalized size: 4660 (depth=19) real=0.5s, user=0.3s, speedup=~-0.2s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 2334 (depth=20) real=0.6s, user=0.3s, speedup=~-0.2s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 1171 (depth=23) real=0.7s, user=0.4s, speedup=~-0.3s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 590 (depth=25) real=0.8s, user=0.4s, speedup=~-0.3s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 300 (depth=26) real=0.9s, user=0.4s, speedup=~-0.4s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 155 (depth=29) real=1.0s, user=0.5s, speedup=~-0.5s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 83 (depth=30) real=1.0s, user=0.5s, speedup=~-0.5s
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 47 (depth=33) real=1.1s, user=0.5s, speedup=~-0.5s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 29 (depth=34) real=1.2s, user=0.6s, speedup=~-0.6s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 20 (depth=37) real=1.3s, user=0.6s, speedup=~-0.6s
New finalized size: 11 (depth=38) real=1.3s, user=0.6s, speedup=~-0.6s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 9 (depth=45) real=1.5s, user=0.7s, speedup=~-0.7s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 8 (depth=46) real=1.5s, user=0.8s, speedup=~-0.7s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
New finalized size: 7 (depth=53) real=1.7s, user=0.9s, speedup=~-0.7s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
Reached the end of our path through tree, all nodes were finalized
45 nodes failed, 44 worked, 21 discarded, 1 collapsed
1.636 seconds of compute was required for final path
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()

Strategy "bisect" complete, output 7 bytes
Input file "grep.in" is now 7 bytes, starting strategy "zero"...
Verifying the original input executes successfully... (skip with --noverify)
The original input file succeeded after 0.0 seconds.
New finalized size: 7 (depth=2) real=0.0s, user=0.0s, speedup=~-0.0s
New finalized size: 7 (depth=5) real=0.0s, user=0.0s, speedup=~-0.0s
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
Reached the end of our path through tree, all nodes were finalized
11 nodes failed, 2 worked, 0 discarded, 1 collapsed
0.230 seconds of compute was required for final path
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()
==19081== Warning: invalid file descriptor -1 in syscall close()

Strategy "zero" complete, output 7 bytes
All work complete, generating output halfempty.out (size: 7)
==19081== 
==19081== HEAP SUMMARY:
==19081==     in use at exit: 24,758 bytes in 37 blocks
==19081==   total heap usage: 9,966 allocs, 9,929 frees, 538,679 bytes allocated
==19081== 
==19081== LEAK SUMMARY:
==19081==    definitely lost: 0 bytes in 0 blocks
==19081==    indirectly lost: 0 bytes in 0 blocks
==19081==      possibly lost: 0 bytes in 0 blocks
==19081==    still reachable: 24,758 bytes in 37 blocks
==19081==         suppressed: 0 bytes in 0 blocks
==19081== Rerun with --leak-check=full to see details of leaked memory
==19081== 
==19081== For lists of detected and suppressed errors, rerun with: -s
==19081== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

I hope this is enough detail for someone familiar with the code to debug it.

[taviso]

Thanks for the detailed report!

I'll try to setup a musl and reproduce it, it's not obvious from the debug messages what's happening. I only see one "Broken pipe received", which is surprising, maybe signal handling is working differently....

[leahneukirchen]

Perhaps this helps, the first SIGPIPE:

(gdb) r
Starting program: /tmp/halfempty/halfempty -P 1 --cleanup-threads=1 grep.sh grep.in
warning: Error disabling address space randomization: Operation not permitted
╭│   │ ── halfempty ───────────────────────────────────────────────── v0.40 ──
╰│  8│ A fast, parallel testcase minimization tool
 ╰───╯ ───────────────────────────────────────────────────────── by @taviso ──

Input file "grep.in" is now 1191359 bytes, starting strategy "bisect"...
[New LWP 19305]
Verifying the original input executes successfully... (skip with --noverify)
[Detaching after fork from child process 19306]

Thread 1 "halfempty" received signal SIGPIPE, Broken pipe.
__cp_end () at src/thread/x86_64/syscall_cp.s:29
29	src/thread/x86_64/syscall_cp.s: No such file or directory.
(gdb) bt
#0  __cp_end () at src/thread/x86_64/syscall_cp.s:29
#1  0x00007fef871d04d6 in __syscall_cp_c (nr=1, u=5, v=140722740964400, w=<optimized out>, x=<optimized out>, y=<optimized out>, z=0) at src/thread/pthread_cancel.c:33
#2  0x00007fef871d9172 in write (fd=fd@entry=5, buf=buf@entry=0x7ffc90fcac30, count=count@entry=1024) at src/unistd/write.c:6
#3  0x000056358f3c824d in sendfile (out_fd=out_fd@entry=5, in_fd=in_fd@entry=3, offset=offset@entry=0x7ffc90fcb0a8, count=count@entry=1191359) at sendfile_generic.c:28
#4  0x000056358f3c8323 in splice (fd_in=fd_in@entry=3, off_in=off_in@entry=0x7ffc90fcb0a8, fd_out=fd_out@entry=5, off_out=off_out@entry=0x0, len=len@entry=1191359, flags=flags@entry=0) at splice_generic.c:17
#5  0x000056358f3c4562 in write_pipe (dataoffset=<optimized out>, closepipe=1, size=1191359, datafd=3, pipefd=5) at proc.c:93
#6  submit_data_subprocess (inputfd=3, inputlen=<optimized out>, childpid=childpid@entry=0x7fef87166fb0) at proc.c:277
#7  0x000056358f3c665d in process_execute_jobs (node=0x56359063ea00) at tree.c:471
#8  0x000056358f3c6a8a in build_bisection_tree (fd=3, callback=0x56358f3c48c0 <strategy_bisect_data>, outfd=outfd@entry=0x7ffc90fcb330, flags=flags@entry=1) at tree.c:118
#9  0x000056358f3c3b22 in main (argc=<optimized out>, argv=<optimized out>) at halfempty.c:321

However, I also tried the generic sendfile backend, and it didn't work either.

[taviso]

I think g_spawn_async_with_pipes might be unreliable with musl, but I don't know if it's a musl bug, a glib bug, or a bug in the way I'm using it.

I'll try to make a minimal repo.

[Hello71]

halfempty/proc.c

Line 52 in 685e752

if (setrlimit(i, &kChildLimits[i]) == -1) {

this is not valid when multi-threaded. from a standards viewpoint, only async-signal-safe functions may be called in the child after forking a multi-threaded program. from a practical viewpoint, before release 1.2.2 (not yet released), musl synchronizes setrlimit across threads using signals and locks. in the child, these locks will hang forever. in musl 1.2.2, fork was changed to synchronize all process state before forking as a workaround for widespread application misuse. therefore, this issue does not occur on Alpine Linux edge. the setrlimit synchronization issue is discussed at https://www.openwall.com/lists/musl/2020/10/15/2. it appears that the conclusion was to use prlimit to avoid this issue, but that change is also pending 1.2.2.

[Hello71]

it is also, strictly speaking, not allowed to call prctl, personality, or setenv, but neither of the former two are likely to actually cause a deadlock. setenv seems like API misuse though, and should probably be changed to properly copy environ to a temporary variable for modification.

[taviso]

Thanks, I agree about setenv, that's a bit hacky, I'll rework it.

There's no way around needing either prlimit or setrlimit, but either would be fine. I could change the code to use prlimit, but IIUC neither will work today, but both will with the next musl release?

[ericonr]

For what it's worth, prlimit doesn't require any synchronization, and should be usable in this context. The issue with depending on it is that it's Linux only.

[Hello71]

There's no way around needing either prlimit or setrlimit, but either would be fine. I could change the code to use prlimit, but IIUC neither will work today, but both will with the next musl release?

prlimit works now, as @ericonr said. SYS_setrlimit and SYS_prlimit also work now, but are even more non-portable. strictly speaking, the only portable way is to prefork a child before starting any threads, and tell it to spawn more children using a pipe or something. practically speaking, I don't think any libc other than pre-1.2.2 musl is going to have any issues with setrlimit after fork, so it's probably sufficient to use prlimit if available, otherwise setrlimit, and wait and see if anyone has issues.

[leahneukirchen]

I tried prlimit(0, i, &kChildLimits[i], NULL) and patching it out completely, but the hangs still appear.

[Hello71]

can you post a strace -f?

[leahneukirchen]

strace of setrlimit and native sendfile:

Details

execve("../halfempty", ["../halfempty", "-P", "1", "--cleanup-threads=1", "grep.sh", "grep.in"], 0x7ffc8592dc60 /* 9 vars */) = 0
arch_prctl(ARCH_SET_FS, 0x7f0e1c60bd08) = 0
set_tid_address(0x7f0e1c60c2d4)         = 20125
open("/root/.idris2/lib/libglib-2.0.so.0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/etc/ld-musl-x86_64.path", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/lib/libglib-2.0.so.0", O_RDONLY|O_CLOEXEC) = 3
fcntl(3, F_SETFD, FD_CLOEXEC)           = 0
fstat(3, {st_mode=S_IFREG|0755, st_size=1224048, ...}) = 0
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200\275\1\0\0\0\0\0"..., 960) = 960
mmap(NULL, 1232896, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f0e1c42d000
mmap(0x7f0e1c448000, 548864, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0x1b000) = 0x7f0e1c448000
mmap(0x7f0e1c4ce000, 557056, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0xa1000) = 0x7f0e1c4ce000
mmap(0x7f0e1c557000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x129000) = 0x7f0e1c557000
mmap(0x7f0e1c559000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f0e1c559000
close(3)                                = 0
open("/root/.idris2/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
fcntl(3, F_SETFD, FD_CLOEXEC)           = 0
fstat(3, {st_mode=S_IFREG|0755, st_size=477040, ...}) = 0
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\"\0\0\0\0\0\0"..., 960) = 960
mmap(NULL, 483328, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f0e1c3b7000
mmap(0x7f0e1c3b9000, 344064, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0x2000) = 0x7f0e1c3b9000
mmap(0x7f0e1c40d000, 122880, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0x56000) = 0x7f0e1c40d000
mmap(0x7f0e1c42b000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x73000) = 0x7f0e1c42b000
close(3)                                = 0
mprotect(0x7f0e1c557000, 4096, PROT_READ) = 0
mprotect(0x7f0e1c608000, 4096, PROT_READ) = 0
mprotect(0x7f0e1c42b000, 4096, PROT_READ) = 0
mprotect(0x55ddbe819000, 8192, PROT_READ) = 0
brk(NULL)                               = 0x55ddbec23000
brk(0x55ddbec28000)                     = 0x55ddbec28000
prlimit64(0, RLIMIT_CPU, NULL, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_FSIZE, NULL, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_DATA, NULL, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_CORE, NULL, {rlim_cur=0, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_RSS, NULL, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_NPROC, NULL, {rlim_cur=62081, rlim_max=62081}) = 0
prlimit64(0, RLIMIT_NOFILE, NULL, {rlim_cur=4*1024, rlim_max=4*1024}) = 0
prlimit64(0, RLIMIT_MEMLOCK, NULL, {rlim_cur=64*1024, rlim_max=64*1024}) = 0
prlimit64(0, RLIMIT_AS, NULL, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_LOCKS, NULL, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}) = 0
prlimit64(0, RLIMIT_SIGPENDING, NULL, {rlim_cur=62081, rlim_max=62081}) = 0
prlimit64(0, RLIMIT_MSGQUEUE, NULL, {rlim_cur=800*1024, rlim_max=800*1024}) = 0
prlimit64(0, RLIMIT_NICE, NULL, {rlim_cur=0, rlim_max=0}) = 0
prlimit64(0, RLIMIT_RTPRIO, NULL, {rlim_cur=0, rlim_max=0}) = 0
sched_getaffinity(0, 128, [0, 1, 2, 3, 4, 5, 6, 7]) = 32
sched_getaffinity(0, 128, [0, 1, 2, 3, 4, 5, 6, 7]) = 32
ioctl(1, TIOCGWINSZ, 0x7ffcea4b3bc0)    = -1 ENOTTY (Not a tty)
ioctl(1, TIOCGWINSZ, 0x7ffcea4b3b40)    = -1 ENOTTY (Not a tty)
writev(1, [{iov_base="", iov_len=0}, {iov_base="\33[36m\342\225\255\342\224\202   \342\224\202\33[0m \342\224\200\342\224\200 hal"..., iov_len=501}], 2�[36m╭│   │�[0m ── halfempty ───────────────────────────────────────────────── v0.40 ──
�[36m╰│�[47m�[30m  8�[0m�[36m│�[0m A fast, parallel testcase minimization tool
�[36m ╰───╯�[0m ───────────────────────────────────────────────────────── by @taviso ──
) = 501
rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=0x55ddbe810090, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f0e1c5d1a1e}, NULL, 8) = 0
prlimit64(0, RLIMIT_NOFILE, NULL, {rlim_cur=4*1024, rlim_max=4*1024}) = 0
rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
prlimit64(0, RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}, NULL) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
access("grep.sh", X_OK)                 = 0
access("grep.in", R_OK)                 = 0
open("grep.in", O_RDONLY)               = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=1191359, ...}) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=1191359, ...}) = 0
ioctl(1, TIOCGWINSZ, 0x7ffcea4b3bf0)    = -1 ENOTTY (Not a tty)
rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
membarrier(MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED, 0) = -1 EPERM (Operation not permitted)
mmap(NULL, 143360, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0e1c394000
mprotect(0x7f0e1c396000, 135168, PROT_READ|PROT_WRITE) = 0
rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
clone(child_stack=0x7f0e1c3b6ad8, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|0x400000strace: Process 20126 attached
, parent_tid=[20126], tls=0x7f0e1c3b6b20, child_tidptr=0x7f0e1c60c2d4) = 20126
[pid 20125] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20126] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20125] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20126] prctl(PR_SET_NAME, "pool-halfempty" <unfinished ...>
[pid 20125] gettid( <unfinished ...>
[pid 20126] <... prctl resumed>)        = 0
[pid 20126] futex(0x55ddbec274d0, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 20125] <... gettid resumed>)       = 20125
[pid 20125] sched_getattr(20125, {size=56, sched_policy=SCHED_OTHER, sched_flags=0, sched_nice=0, sched_priority=0, sched_runtime=0, sched_deadline=0, sched_period=0, sched_util_min=0, sched_util_max=0}, 56, 0) = 0
[pid 20125] sched_setattr(20125, {size=56, sched_policy=SCHED_OTHER, sched_flags=0, sched_nice=0, sched_priority=0, sched_runtime=0, sched_deadline=0, sched_period=0, sched_util_min=0, sched_util_max=0}, 0) = 0
[pid 20125] brk(0x55ddbec29000)         = 0x55ddbec29000
[pid 20125] fstat(3, {st_mode=S_IFREG|0644, st_size=1191359, ...}) = 0
[pid 20125] ioctl(1, TIOCGWINSZ, 0x7ffcea4b3b10) = -1 ENOTTY (Not a tty)
[pid 20125] pipe([4, 5])                = 0
[pid 20125] pipe([6, 7])                = 0
[pid 20125] rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
[pid 20125] fork(strace: Process 20127 attached
)                      = 20127
[pid 20125] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20125] close(7)                    = 0
[pid 20125] read(6,  <unfinished ...>
[pid 20127] gettid()                    = 20127
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigaction(SIGCHLD, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20127] rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20127] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20127] rt_sigaction(SIGHUP, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20127] rt_sigaction(SIGPIPE, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=0x55ddbe810090, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f0e1c5d1a1e}, 8) = 0
[pid 20127] close(6)                    = 0
[pid 20127] close(5)                    = 0
[pid 20127] dup2(4, 0)                  = 0
[pid 20127] fcntl(4, F_SETFD, FD_CLOEXEC) = 0
[pid 20127] open("/dev/null", O_WRONLY) = 5
[pid 20127] dup2(5, 1)                  = 1
[pid 20127] close(5)                    = 0
[pid 20127] open("/dev/null", O_WRONLY) = 5
[pid 20127] dup2(5, 2)                  = 2
[pid 20127] close(5)                    = 0
[pid 20127] open("/proc/self/fd", O_RDONLY|O_DIRECTORY) = 5
[pid 20127] getdents64(5, 0x7ffcea4b2700 /* 9 entries */, 4096) = 216
[pid 20127] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20127] fcntl(4, F_SETFD, FD_CLOEXEC) = 0
[pid 20127] fcntl(7, F_SETFD, FD_CLOEXEC) = 0
[pid 20127] getdents64(5, 0x7ffcea4b2700 /* 0 entries */, 4096) = 0
[pid 20127] close(5)                    = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_CPU, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_DATA, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_CORE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_RSS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_NPROC, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=64*1024, rlim_max=64*1024}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_AS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_LOCKS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_SIGPENDING, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_MSGQUEUE, {rlim_cur=800*1024, rlim_max=800*1024}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_NICE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20127] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20127] prlimit64(0, RLIMIT_RTPRIO, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] setpgid(0, 0)               = 0
[pid 20127] prctl(PR_SET_PDEATHSIG, SIGTERM) = 0
[pid 20127] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20127] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20127] execve("/bin/grep.sh", ["grep.sh"], 0x55ddbec27940 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20127] execve("/usr/bin/grep.sh", ["grep.sh"], 0x55ddbec27940 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20127] execve("./grep.sh", ["grep.sh"], 0x55ddbec27940 /* 10 vars */ <unfinished ...>
[pid 20125] <... read resumed>"", 8)    = 0
[pid 20125] close(6)                    = 0
[pid 20127] <... execve resumed>)       = 0
[pid 20125] close(4 <unfinished ...>
[pid 20127] arch_prctl(ARCH_SET_FS, 0x7f40533fbd08 <unfinished ...>
[pid 20125] <... close resumed>)        = 0
[pid 20127] <... arch_prctl resumed>)   = 0
[pid 20127] set_tid_address(0x7f40533fc2d4 <unfinished ...>
[pid 20125] splice(3, [0], 5, NULL, 1191359, 0 <unfinished ...>
[pid 20127] <... set_tid_address resumed>) = 20127
[pid 20125] <... splice resumed>)       = 65536
[pid 20125] splice(3, [65536], 5, NULL, 1125823, 0 <unfinished ...>
[pid 20127] mprotect(0x7f40533f8000, 4096, PROT_READ) = 0
[pid 20127] mprotect(0x561a7dbd8000, 8192, PROT_READ) = 0
[pid 20127] getpid()                    = 20127
[pid 20127] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20127] rt_sigaction(SIGCHLD, {sa_handler=0x561a7dbcd940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f40533c1a1e}, NULL, 8) = 0
[pid 20127] geteuid()                   = 0
[pid 20127] getppid()                   = 20125
[pid 20127] stat("/tmp/halfempty/test", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20127] stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20127] open("./grep.sh", O_RDONLY) = 3
[pid 20127] fcntl(3, F_DUPFD, 10)       = 10
[pid 20127] close(3)                    = 0
[pid 20127] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20127] rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20127] rt_sigaction(SIGINT, {sa_handler=0x561a7dbcd940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f40533c1a1e}, NULL, 8) = 0
[pid 20127] rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20127] rt_sigaction(SIGQUIT, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f40533c1a1e}, NULL, 8) = 0
[pid 20127] rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20127] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f40533c1a1e}, NULL, 8) = 0
[pid 20127] read(10, "#!/bin/sh\n# Copyright 2018 Googl"..., 1024) = 686
[pid 20127] stat("/root/.idris2/bin/grep", 0x7ffd7f1e3480) = -1 ENOENT (No such file or directory)
[pid 20127] stat("/usr/local/sbin/grep", 0x7ffd7f1e3480) = -1 ENOENT (No such file or directory)
[pid 20127] stat("/usr/local/bin/grep", 0x7ffd7f1e3480) = -1 ENOENT (No such file or directory)
[pid 20127] stat("/usr/sbin/grep", {st_mode=S_IFREG|0755, st_size=219248, ...}) = 0
[pid 20127] rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1 RT_2], NULL, 8) = 0
[pid 20127] vfork(strace: Process 20128 attached
 <unfinished ...>
[pid 20128] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20128] execve("/usr/sbin/grep", ["grep", "-q", "^bisect$"], 0x561a7dbdaf40 /* 10 vars */ <unfinished ...>
[pid 20127] <... vfork resumed>)        = 20128
[pid 20127] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20127] wait4(-1,  <unfinished ...>
[pid 20128] <... execve resumed>)       = 0
[pid 20128] arch_prctl(ARCH_SET_FS, 0x7f2ffad8ad08) = 0
[pid 20128] set_tid_address(0x7f2ffad8b2d4) = 20128
[pid 20128] open("/root/.idris2/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20128] open("/etc/ld-musl-x86_64.path", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20128] open("/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
[pid 20128] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20128] fstat(3, {st_mode=S_IFREG|0755, st_size=477040, ...}) = 0
[pid 20128] read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\"\0\0\0\0\0\0"..., 960) = 960
[pid 20128] mmap(NULL, 483328, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f2ffac63000
[pid 20128] mmap(0x7f2ffac65000, 344064, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0x2000) = 0x7f2ffac65000
[pid 20128] mmap(0x7f2ffacb9000, 122880, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0x56000) = 0x7f2ffacb9000
[pid 20128] mmap(0x7f2ffacd7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x73000) = 0x7f2ffacd7000
[pid 20128] close(3)                    = 0
[pid 20128] mprotect(0x7f2ffacd7000, 4096, PROT_READ) = 0
[pid 20128] mprotect(0x7f2ffad87000, 4096, PROT_READ) = 0
[pid 20128] mprotect(0x5579181ec000, 4096, PROT_READ) = 0
[pid 20128] sigaltstack({ss_sp=0x5579181ed600, ss_flags=0, ss_size=65536}, NULL) = 0
[pid 20128] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20128] rt_sigaction(SIGSEGV, {sa_handler=0x5579181c2c70, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|SA_SIGINFO, sa_restorer=0x7f2ffad50a1e}, NULL, 8) = 0
[pid 20128] brk(NULL)                   = 0x5579196a0000
[pid 20128] brk(0x5579196a1000)         = 0x5579196a1000
[pid 20128] brk(0x5579196a2000)         = 0x5579196a2000
[pid 20128] brk(0x5579196a4000)         = 0x5579196a4000
[pid 20128] brk(0x5579196be000)         = 0x5579196be000
[pid 20128] fstat(0, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid 20128] lseek(0, 0, SEEK_CUR)       = -1 ESPIPE (Invalid seek)
[pid 20128] read(0, "icecap\nLara's\nshoddier\ndoublet\nv"..., 98304) = 65536
[pid 20125] <... splice resumed>)       = 65536
[pid 20125] splice(3, [131072], 5, NULL, 1060287, 0 <unfinished ...>
[pid 20128] read(0, "\npermits\nfreaks\nthou\nmoocher's\ns"..., 32768) = 32768
[pid 20125] <... splice resumed>)       = 32768
[pid 20125] splice(3, [163840], 5, NULL, 1027519, 0 <unfinished ...>
[pid 20128] read(0, "mhole's\nElsinore\nphotoing\nsuperi"..., 98304) = 65536
[pid 20125] <... splice resumed>)       = 65536
[pid 20125] splice(3, [229376], 5, NULL, 961983, 0 <unfinished ...>
[pid 20128] read(0, "\ndelving\nEDP's\npolytechnics\ncolo"..., 32768) = 32768
[pid 20125] <... splice resumed>)       = 32768
[pid 20125] splice(3, [262144], 5, NULL, 929215, 0 <unfinished ...>
[pid 20128] read(0, "'s\ndeadlines\nbloodstream\nfuror\nD"..., 98304) = 65536
[pid 20125] <... splice resumed>)       = 65536
[pid 20125] splice(3, [327680], 5, NULL, 863679, 0 <unfinished ...>
[pid 20128] read(0, "assaging\nunwisely\ninlay's\nAnabel"..., 32768) = 32768
[pid 20125] <... splice resumed>)       = 32768
[pid 20125] splice(3, [360448], 5, NULL, 830911, 0 <unfinished ...>
[pid 20128] read(0, "fords\nAhab\noverpower\nMIDI's\nisol"..., 98304) = 65536
[pid 20125] <... splice resumed>)       = 65536
[pid 20125] splice(3, [425984], 5, NULL, 765375, 0 <unfinished ...>
[pid 20128] read(0, "n's\npotential's\nallotting\ncharbr"..., 32768) = 32768
[pid 20125] <... splice resumed>)       = 32768
[pid 20128] read(0,  <unfinished ...>
[pid 20125] splice(3, [458752], 5, NULL, 732607, 0) = 65536
[pid 20128] <... read resumed>"enestrations\ntercentenary's\nblen"..., 98304) = 65536
[pid 20125] splice(3, [524288], 5, NULL, 667071, 0 <unfinished ...>
[pid 20128] read(0, "t's\ntwp\nmidwife's\nsolemnized\nEla"..., 32768) = 32768
[pid 20125] <... splice resumed>)       = 32768
[pid 20125] splice(3, [557056], 5, NULL, 634303, 0 <unfinished ...>
[pid 20128] read(0, "medanisms\ncolorizing\nFranks's\nCo"..., 98304) = 65536
[pid 20125] <... splice resumed>)       = 65536
[pid 20125] splice(3, [622592], 5, NULL, 568767, 0 <unfinished ...>
[pid 20128] read(0, "ctors\ntoughened\nLehman\nsystemati"..., 32768) = 32768
[pid 20125] <... splice resumed>)       = 32768
[pid 20125] splice(3, [655360], 5, NULL, 535999, 0 <unfinished ...>
[pid 20128] read(0, "ness's\nGoethe's\nstealthiness\nint"..., 98304) = 65536
[pid 20125] <... splice resumed>)       = 65536
[pid 20125] splice(3, [720896], 5, NULL, 470463, 0 <unfinished ...>
[pid 20128] read(0, "den's\nintransigently\nLupe's\ncirc"..., 32768) = 32768
[pid 20125] <... splice resumed>)       = 32768
[pid 20125] splice(3, [753664], 5, NULL, 437695, 0 <unfinished ...>
[pid 20128] read(0, "rberus's\nefflux\nkookiest\nrectang"..., 98304) = 65536
[pid 20125] <... splice resumed>)       = 65536
[pid 20125] splice(3, [819200], 5, NULL, 372159, 0 <unfinished ...>
[pid 20128] read(0, "xivity\ncrannies\nHQ's\ncyst's\nAnto"..., 32768) = 32768
[pid 20125] <... splice resumed>)       = 32768
[pid 20125] splice(3, [851968], 5, NULL, 339391, 0 <unfinished ...>
[pid 20128] read(0,  <unfinished ...>
[pid 20125] <... splice resumed>)       = 65536
[pid 20128] <... read resumed>"ngs\namercements\nnewscasters\nguar"..., 98304) = 65536
[pid 20128] read(0, "dailiness\nedifying\nautopsy\npriva"..., 32768) = 32768
[pid 20128] close(1)                    = 0
[pid 20128] close(2 <unfinished ...>
[pid 20125] splice(3, [917504], 5, NULL, 273855, 0 <unfinished ...>
[pid 20128] <... close resumed>)        = 0
[pid 20125] <... splice resumed>)       = 32768
[pid 20125] splice(3, [950272], 5, NULL, 241087, 0 <unfinished ...>
[pid 20128] exit_group(0)               = ?
[pid 20128] +++ exited with 0 +++
[pid 20127] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 20128
[pid 20127] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20128, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
[pid 20127] rt_sigreturn({mask=[]})     = 20128
[pid 20127] wait4(-1, 0x7ffd7f1e34ec, WNOHANG, NULL) = -1 ECHILD (No child process)
[pid 20127] read(10, "", 1024)          = 0
[pid 20127] exit_group(0)               = ?
[pid 20127] +++ exited with 0 +++
[pid 20125] <... splice resumed>)       = -1 EPIPE (Broken pipe)
[pid 20125] --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=20125, si_uid=0} ---
[pid 20125] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20127, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
[pid 20125] rt_sigreturn({mask=[]})     = -1 EPIPE (Broken pipe)
[pid 20125] close(5)                    = 0
[pid 20125] waitid(P_PID, 20127, {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20127, si_uid=0, si_status=0, si_utime=0, si_stime=0}, WEXITED|WNOWAIT, NULL) = 0
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 20125] ioctl(1, TIOCGWINSZ, 0x7ffcea4b3b10) = -1 ENOTTY (Not a tty)
[pid 20125] ioctl(1, TIOCGWINSZ, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20125] ioctl(1, TIOCGWINSZ, 0x7ffcea4b3b10) = -1 ENOTTY (Not a tty)
[pid 20125] fstat(3, {st_mode=S_IFREG|0644, st_size=1191359, ...}) = 0
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600) = -1 EOPNOTSUPP (Not supported)
[pid 20125] futex(0x7f0e1c5589c8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
[pid 20125] open("/tmp/.0ZBGW0", O_RDWR|O_CREAT|O_EXCL, 0600) = 4
[pid 20125] unlink("/tmp/.0ZBGW0")      = 0
[pid 20125] fstat(4, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
[pid 20125] futex(0x55ddbec274d0, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 20125] ioctl(1, TIOCGWINSZ, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20125] fstat(3, {st_mode=S_IFREG|0644, st_size=1191359, ...}) = 0
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600) = -1 EOPNOTSUPP (Not supported)
[pid 20125] open("/tmp/.DABGW0", O_RDWR|O_CREAT|O_EXCL, 0600) = 5
[pid 20125] unlink("/tmp/.DABGW0")      = 0
[pid 20125] sendfile(5, 3, [595679] <unfinished ...>
[pid 20126] <... futex resumed>)        = 0
[pid 20126] brk(0x55ddbec2a000 <unfinished ...>
[pid 20125] <... sendfile resumed> => [1191359], 595680) = 595680
[pid 20126] <... brk resumed>)          = 0x55ddbec2a000
[pid 20125] fstat(5, {st_mode=S_IFREG|0600, st_size=595680, ...}) = 0
[pid 20126] pipe( <unfinished ...>
[pid 20125] ioctl(1, TIOCGWINSZ <unfinished ...>
[pid 20126] <... pipe resumed>[6, 7])   = 0
[pid 20125] <... ioctl resumed>, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20126] pipe([8, 9])                = 0
[pid 20125] fstat(3,  <unfinished ...>
[pid 20126] rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0644, st_size=1191359, ...}) = 0
[pid 20126] fork( <unfinished ...>
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600) = -1 EOPNOTSUPP (Not supported)
[pid 20125] open("/tmp/.FOAGW0", O_RDWR|O_CREAT|O_EXCL, 0600strace: Process 20129 attached
 <unfinished ...>
[pid 20126] <... fork resumed>)         = 20129
[pid 20126] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20125] <... open resumed>)         = 10
[pid 20129] gettid( <unfinished ...>
[pid 20126] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20125] unlink("/tmp/.FOAGW0" <unfinished ...>
[pid 20129] <... gettid resumed>)       = 20129
[pid 20126] close(9 <unfinished ...>
[pid 20125] <... unlink resumed>)       = 0
[pid 20125] sendfile(10, 3, [0] => [595679], 595679) = 595679
[pid 20125] sendfile(10, 3, [1191358] => [1191359], 1) = 1
[pid 20125] fstat(10,  <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=595680, ...}) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20126] read(8,  <unfinished ...>
[pid 20125] ioctl(1, TIOCGWINSZ <unfinished ...>
[pid 20129] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20125] <... ioctl resumed>, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20129] rt_sigaction(SIGCHLD, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20125] fstat(3,  <unfinished ...>
[pid 20129] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0644, st_size=1191359, ...}) = 0
[pid 20129] rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600) = -1 EOPNOTSUPP (Not supported)
[pid 20129] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20125] open("/tmp/.GMLGW0", O_RDWR|O_CREAT|O_EXCL, 0600 <unfinished ...>
[pid 20129] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20129] rt_sigaction(SIGHUP, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20129] rt_sigaction(SIGPIPE, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=0x55ddbe810090, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f0e1c5d1a1e}, 8) = 0
[pid 20129] close(8)                    = 0
[pid 20129] close(7 <unfinished ...>
[pid 20125] <... open resumed>)         = 9
[pid 20129] <... close resumed>)        = 0
[pid 20125] unlink("/tmp/.GMLGW0" <unfinished ...>
[pid 20129] dup2(6, 0 <unfinished ...>
[pid 20125] <... unlink resumed>)       = 0
[pid 20129] <... dup2 resumed>)         = 0
[pid 20129] fcntl(6, F_SETFD, FD_CLOEXEC) = 0
[pid 20129] open("/dev/null", O_WRONLY) = 7
[pid 20129] dup2(7, 1)                  = 1
[pid 20129] close(7)                    = 0
[pid 20129] open("/dev/null", O_WRONLY) = 7
[pid 20129] dup2(7, 2)                  = 2
[pid 20125] sendfile(9, 3, [297839] <unfinished ...>
[pid 20129] close(7)                    = 0
[pid 20129] open("/proc/self/fd", O_RDONLY|O_DIRECTORY) = 7
[pid 20129] getdents64(7, 0x7f0e1c3b5500 /* 11 entries */, 4096) = 264
[pid 20129] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20129] fcntl(4, F_SETFD, FD_CLOEXEC) = 0
[pid 20129] fcntl(5, F_SETFD, FD_CLOEXEC) = 0
[pid 20129] fcntl(6, F_SETFD, FD_CLOEXEC) = 0
[pid 20125] <... sendfile resumed> => [1191359], 893520) = 893520
[pid 20129] fcntl(9, F_SETFD, FD_CLOEXEC <unfinished ...>
[pid 20125] fstat(9, {st_mode=S_IFREG|0600, st_size=893520, ...}) = 0
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 1, {tv_sec=4, tv_nsec=999998992} <unfinished ...>
[pid 20129] <... fcntl resumed>)        = 0
[pid 20129] getdents64(7, 0x7f0e1c3b5500 /* 0 entries */, 4096) = 0
[pid 20129] close(7)                    = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_CPU, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_DATA, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_CORE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_RSS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_NPROC, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=64*1024, rlim_max=64*1024}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_AS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_LOCKS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_SIGPENDING, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_MSGQUEUE, {rlim_cur=800*1024, rlim_max=800*1024}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_NICE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20129] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20129] prlimit64(0, RLIMIT_RTPRIO, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20129] setpgid(0, 0)               = 0
[pid 20129] prctl(PR_SET_PDEATHSIG, SIGTERM) = 0
[pid 20129] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20129] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20129] execve("/bin/grep.sh", ["grep.sh"], 0x55ddbec28a40 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20129] execve("/usr/bin/grep.sh", ["grep.sh"], 0x55ddbec28a40 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20129] execve("./grep.sh", ["grep.sh"], 0x55ddbec28a40 /* 10 vars */ <unfinished ...>
[pid 20126] <... read resumed>"", 8)    = 0
[pid 20129] <... execve resumed>)       = 0
[pid 20126] close(8 <unfinished ...>
[pid 20129] arch_prctl(ARCH_SET_FS, 0x7fd69d620d08 <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20129] <... arch_prctl resumed>)   = 0
[pid 20126] close(6 <unfinished ...>
[pid 20129] set_tid_address(0x7fd69d6212d4 <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20129] <... set_tid_address resumed>) = 20129
[pid 20126] close(7)                    = 0
[pid 20129] mprotect(0x7fd69d61d000, 4096, PROT_READ <unfinished ...>
[pid 20126] waitid(P_PID, 20129,  <unfinished ...>
[pid 20129] <... mprotect resumed>)     = 0
[pid 20129] mprotect(0x562164836000, 8192, PROT_READ) = 0
[pid 20129] getpid()                    = 20129
[pid 20129] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20129] rt_sigaction(SIGCHLD, {sa_handler=0x56216482b940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7fd69d5e6a1e}, NULL, 8) = 0
[pid 20129] geteuid()                   = 0
[pid 20129] getppid()                   = 20125
[pid 20129] stat("/tmp/halfempty/test", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20129] stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20129] open("./grep.sh", O_RDONLY) = 3
[pid 20129] fcntl(3, F_DUPFD, 10)       = 10
[pid 20129] close(3)                    = 0
[pid 20129] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20129] rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20129] rt_sigaction(SIGINT, {sa_handler=0x56216482b940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7fd69d5e6a1e}, NULL, 8) = 0
[pid 20129] rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20129] rt_sigaction(SIGQUIT, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7fd69d5e6a1e}, NULL, 8) = 0
[pid 20129] rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20129] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7fd69d5e6a1e}, NULL, 8) = 0
[pid 20129] read(10, "#!/bin/sh\n# Copyright 2018 Googl"..., 1024) = 686
[pid 20129] stat("/root/.idris2/bin/grep", 0x7ffd98a88f30) = -1 ENOENT (No such file or directory)
[pid 20129] stat("/usr/local/sbin/grep", 0x7ffd98a88f30) = -1 ENOENT (No such file or directory)
[pid 20129] stat("/usr/local/bin/grep", 0x7ffd98a88f30) = -1 ENOENT (No such file or directory)
[pid 20129] stat("/usr/sbin/grep", {st_mode=S_IFREG|0755, st_size=219248, ...}) = 0
[pid 20129] rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1 RT_2], NULL, 8) = 0
[pid 20129] vfork(strace: Process 20130 attached
 <unfinished ...>
[pid 20130] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20130] execve("/usr/sbin/grep", ["grep", "-q", "^bisect$"], 0x562164838f40 /* 10 vars */ <unfinished ...>
[pid 20129] <... vfork resumed>)        = 20130
[pid 20129] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20130] <... execve resumed>)       = 0
[pid 20129] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20129] wait4(-1,  <unfinished ...>
[pid 20130] arch_prctl(ARCH_SET_FS, 0x7ff61f99ad08) = 0
[pid 20130] set_tid_address(0x7ff61f99b2d4) = 20130
[pid 20130] open("/root/.idris2/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20130] open("/etc/ld-musl-x86_64.path", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20130] open("/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
[pid 20130] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20130] fstat(3, {st_mode=S_IFREG|0755, st_size=477040, ...}) = 0
[pid 20130] read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\"\0\0\0\0\0\0"..., 960) = 960
[pid 20130] mmap(NULL, 483328, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ff61f873000
[pid 20130] mmap(0x7ff61f875000, 344064, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0x2000) = 0x7ff61f875000
[pid 20130] mmap(0x7ff61f8c9000, 122880, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0x56000) = 0x7ff61f8c9000
[pid 20130] mmap(0x7ff61f8e7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x73000) = 0x7ff61f8e7000
[pid 20130] close(3)                    = 0
[pid 20130] mprotect(0x7ff61f8e7000, 4096, PROT_READ) = 0
[pid 20130] mprotect(0x7ff61f997000, 4096, PROT_READ) = 0
[pid 20130] mprotect(0x5626b733b000, 4096, PROT_READ) = 0
[pid 20130] sigaltstack({ss_sp=0x5626b733c600, ss_flags=0, ss_size=65536}, NULL) = 0
[pid 20130] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20130] rt_sigaction(SIGSEGV, {sa_handler=0x5626b7311c70, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|SA_SIGINFO, sa_restorer=0x7ff61f960a1e}, NULL, 8) = 0
[pid 20130] brk(NULL)                   = 0x5626b885e000
[pid 20130] brk(0x5626b885f000)         = 0x5626b885f000
[pid 20130] brk(0x5626b8860000)         = 0x5626b8860000
[pid 20130] brk(0x5626b8862000)         = 0x5626b8862000
[pid 20130] brk(0x5626b887c000)         = 0x5626b887c000
[pid 20130] fstat(0, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid 20130] lseek(0, 0, SEEK_CUR)       = -1 ESPIPE (Invalid seek)
[pid 20130] read(0, "", 98304)          = 0
[pid 20130] close(1)                    = 0
[pid 20130] close(2)                    = 0
[pid 20130] exit_group(1)               = ?
[pid 20130] +++ exited with 1 +++
[pid 20129] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 1}], 0, NULL) = 20130
[pid 20129] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20130, si_uid=0, si_status=1, si_utime=0, si_stime=0} ---
[pid 20129] rt_sigreturn({mask=[]})     = 20130
[pid 20129] wait4(-1, 0x7ffd98a88f9c, WNOHANG, NULL) = -1 ECHILD (No child process)
[pid 20129] read(10, "", 1024)          = 0
[pid 20129] exit_group(1)               = ?
[pid 20129] +++ exited with 1 +++
[pid 20126] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20129, si_uid=0, si_status=1, si_utime=0, si_stime=0}, WEXITED|WNOWAIT, NULL) = 0
[pid 20126] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20129, si_uid=0, si_status=1, si_utime=0, si_stime=0} ---
[pid 20126] brk(0x55ddbec2b000)         = 0x55ddbec2b000
[pid 20126] mmap(NULL, 143360, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0e1c371000
[pid 20126] mprotect(0x7f0e1c373000, 135168, PROT_READ|PROT_WRITE) = 0
[pid 20126] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20126] clone(child_stack=0x7f0e1c393ad8, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|0x400000strace: Process 20131 attached
 <unfinished ...>
[pid 20131] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20126] <... clone resumed>, parent_tid=[20131], tls=0x7f0e1c393b20, child_tidptr=0x7f0e1c60c2d4) = 20131
[pid 20131] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20126] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20131] gettid( <unfinished ...>
[pid 20126] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20131] <... gettid resumed>)       = 20131
[pid 20126] futex(0x55ddbe81b428, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] sched_setattr(20131, {size=56, sched_policy=SCHED_OTHER, sched_flags=0, sched_nice=0, sched_priority=0, sched_runtime=0, sched_deadline=0, sched_period=0, sched_util_min=0, sched_util_max=0} <unfinished ...>
[pid 20125] <... futex resumed>)        = 0
[pid 20126] <... futex resumed>)        = 1
[pid 20131] <... sched_setattr resumed>, 0) = 0
[pid 20126] pipe( <unfinished ...>
[pid 20131] prctl(PR_SET_NAME, "pool-halfempty" <unfinished ...>
[pid 20126] <... pipe resumed>[6, 7])   = 0
[pid 20131] <... prctl resumed>)        = 0
[pid 20126] pipe( <unfinished ...>
[pid 20131] kill(-20129, SIGTERM <unfinished ...>
[pid 20126] <... pipe resumed>[8, 11])  = 0
[pid 20131] <... kill resumed>)         = 0
[pid 20126] rt_sigprocmask(SIG_BLOCK, ~[],  <unfinished ...>
[pid 20125] ioctl(1, TIOCGWINSZ <unfinished ...>
[pid 20131] close(4 <unfinished ...>
[pid 20126] <... rt_sigprocmask resumed>[], 8) = 0
[pid 20125] <... ioctl resumed>, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20131] <... close resumed>)        = 0
[pid 20131] wait4(20129,  <unfinished ...>
[pid 20126] fork( <unfinished ...>
[pid 20131] <... wait4 resumed>NULL, WNOHANG, NULL) = 20129
strace: Process 20132 attached
[pid 20131] futex(0x7f0e1c559ed0, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=499998843} <unfinished ...>
[pid 20132] gettid( <unfinished ...>
[pid 20126] <... fork resumed>)         = 20132
[pid 20132] <... gettid resumed>)       = 20132
[pid 20126] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20132] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20126] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20132] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20126] close(11 <unfinished ...>
[pid 20132] rt_sigaction(SIGCHLD, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20132] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20126] read(8,  <unfinished ...>
[pid 20132] rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20132] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20132] rt_sigaction(SIGHUP, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20132] rt_sigaction(SIGPIPE, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=0x55ddbe810090, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f0e1c5d1a1e}, 8) = 0
[pid 20132] close(8)                    = 0
[pid 20132] close(7)                    = 0
[pid 20132] dup2(6, 0)                  = 0
[pid 20132] fcntl(6, F_SETFD, FD_CLOEXEC) = 0
[pid 20132] open("/dev/null", O_WRONLY) = 4
[pid 20132] dup2(4, 1)                  = 1
[pid 20132] close(4)                    = 0
[pid 20132] open("/dev/null", O_WRONLY) = 4
[pid 20132] dup2(4, 2)                  = 2
[pid 20132] close(4)                    = 0
[pid 20132] open("/proc/self/fd", O_RDONLY|O_DIRECTORY) = 4
[pid 20132] getdents64(4, 0x7f0e1c3b5500 /* 12 entries */, 4096) = 288
[pid 20132] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20132] fcntl(5, F_SETFD, FD_CLOEXEC) = 0
[pid 20132] fcntl(6, F_SETFD, FD_CLOEXEC) = 0
[pid 20132] fcntl(9, F_SETFD, FD_CLOEXEC) = 0
[pid 20132] fcntl(10, F_SETFD, FD_CLOEXEC <unfinished ...>
[pid 20125] fstat(3,  <unfinished ...>
[pid 20132] <... fcntl resumed>)        = 0
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0644, st_size=1191359, ...}) = 0
[pid 20132] fcntl(11, F_SETFD, FD_CLOEXEC <unfinished ...>
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600 <unfinished ...>
[pid 20132] <... fcntl resumed>)        = 0
[pid 20125] <... open resumed>)         = -1 EOPNOTSUPP (Not supported)
[pid 20132] getdents64(4,  <unfinished ...>
[pid 20125] open("/tmp/.VFJFW0", O_RDWR|O_CREAT|O_EXCL, 0600 <unfinished ...>
[pid 20132] <... getdents64 resumed>0x7f0e1c3b5500 /* 0 entries */, 4096) = 0
[pid 20125] <... open resumed>)         = 4
[pid 20132] close(4 <unfinished ...>
[pid 20125] unlink("/tmp/.VFJFW0" <unfinished ...>
[pid 20132] <... close resumed>)        = 0
[pid 20125] <... unlink resumed>)       = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2],  <unfinished ...>
[pid 20125] sendfile(4, 3, [0] <unfinished ...>
[pid 20132] <... rt_sigprocmask resumed>[], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_CPU, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY},  <unfinished ...>
[pid 20125] <... sendfile resumed> => [297839], 297839) = 297839
[pid 20132] <... prlimit64 resumed>NULL) = 0
[pid 20125] sendfile(4, 3, [595678] <unfinished ...>
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20125] <... sendfile resumed> => [1191359], 595681) = 595681
[pid 20125] fstat(4, {st_mode=S_IFREG|0600, st_size=893520, ...}) = 0
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 2, {tv_sec=4, tv_nsec=999999289} <unfinished ...>
[pid 20132] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_DATA, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_CORE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_RSS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_NPROC, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=64*1024, rlim_max=64*1024}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_AS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_LOCKS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_SIGPENDING, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_MSGQUEUE, {rlim_cur=800*1024, rlim_max=800*1024}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_NICE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20132] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20132] prlimit64(0, RLIMIT_RTPRIO, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20132] setpgid(0, 0)               = 0
[pid 20132] prctl(PR_SET_PDEATHSIG, SIGTERM) = 0
[pid 20132] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20132] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20132] execve("/bin/grep.sh", ["grep.sh"], 0x55ddbec27920 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20132] execve("/usr/bin/grep.sh", ["grep.sh"], 0x55ddbec27920 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20132] execve("./grep.sh", ["grep.sh"], 0x55ddbec27920 /* 10 vars */ <unfinished ...>
[pid 20126] <... read resumed>"", 8)    = 0
[pid 20132] <... execve resumed>)       = 0
[pid 20126] close(8 <unfinished ...>
[pid 20132] arch_prctl(ARCH_SET_FS, 0x7fde11e60d08) = 0
[pid 20126] <... close resumed>)        = 0
[pid 20132] set_tid_address(0x7fde11e612d4 <unfinished ...>
[pid 20126] close(6 <unfinished ...>
[pid 20132] <... set_tid_address resumed>) = 20132
[pid 20126] <... close resumed>)        = 0
[pid 20126] splice(5, [0], 7, NULL, 595680, 0 <unfinished ...>
[pid 20132] mprotect(0x7fde11e5d000, 4096, PROT_READ <unfinished ...>
[pid 20126] <... splice resumed>)       = 65536
[pid 20132] <... mprotect resumed>)     = 0
[pid 20126] splice(5, [65536], 7, NULL, 530144, 0 <unfinished ...>
[pid 20132] mprotect(0x55587363d000, 8192, PROT_READ) = 0
[pid 20132] getpid()                    = 20132
[pid 20132] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20132] rt_sigaction(SIGCHLD, {sa_handler=0x555873632940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7fde11e26a1e}, NULL, 8) = 0
[pid 20132] geteuid()                   = 0
[pid 20132] getppid()                   = 20125
[pid 20132] stat("/tmp/halfempty/test", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20132] stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20132] open("./grep.sh", O_RDONLY) = 3
[pid 20132] fcntl(3, F_DUPFD, 10)       = 10
[pid 20132] close(3)                    = 0
[pid 20132] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20132] rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20132] rt_sigaction(SIGINT, {sa_handler=0x555873632940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7fde11e26a1e}, NULL, 8) = 0
[pid 20132] rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20132] rt_sigaction(SIGQUIT, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7fde11e26a1e}, NULL, 8) = 0
[pid 20132] rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20132] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7fde11e26a1e}, NULL, 8) = 0
[pid 20132] read(10, "#!/bin/sh\n# Copyright 2018 Googl"..., 1024) = 686
[pid 20132] stat("/root/.idris2/bin/grep", 0x7fff80b050b0) = -1 ENOENT (No such file or directory)
[pid 20132] stat("/usr/local/sbin/grep", 0x7fff80b050b0) = -1 ENOENT (No such file or directory)
[pid 20132] stat("/usr/local/bin/grep", 0x7fff80b050b0) = -1 ENOENT (No such file or directory)
[pid 20132] stat("/usr/sbin/grep", {st_mode=S_IFREG|0755, st_size=219248, ...}) = 0
[pid 20132] rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1 RT_2], NULL, 8) = 0
[pid 20132] vfork(strace: Process 20133 attached
 <unfinished ...>
[pid 20133] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20133] execve("/usr/sbin/grep", ["grep", "-q", "^bisect$"], 0x55587363ff40 /* 10 vars */ <unfinished ...>
[pid 20132] <... vfork resumed>)        = 20133
[pid 20132] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20133] <... execve resumed>)       = 0
[pid 20133] arch_prctl(ARCH_SET_FS, 0x7fa4fec09d08 <unfinished ...>
[pid 20132] wait4(-1,  <unfinished ...>
[pid 20133] <... arch_prctl resumed>)   = 0
[pid 20133] set_tid_address(0x7fa4fec0a2d4) = 20133
[pid 20133] open("/root/.idris2/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20133] open("/etc/ld-musl-x86_64.path", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20133] open("/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
[pid 20133] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20133] fstat(3, {st_mode=S_IFREG|0755, st_size=477040, ...}) = 0
[pid 20133] read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\"\0\0\0\0\0\0"..., 960) = 960
[pid 20133] mmap(NULL, 483328, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fa4feae2000
[pid 20133] mmap(0x7fa4feae4000, 344064, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0x2000) = 0x7fa4feae4000
[pid 20133] mmap(0x7fa4feb38000, 122880, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0x56000) = 0x7fa4feb38000
[pid 20133] mmap(0x7fa4feb56000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x73000) = 0x7fa4feb56000
[pid 20133] close(3)                    = 0
[pid 20133] mprotect(0x7fa4feb56000, 4096, PROT_READ) = 0
[pid 20133] mprotect(0x7fa4fec06000, 4096, PROT_READ) = 0
[pid 20133] mprotect(0x557adff49000, 4096, PROT_READ) = 0
[pid 20133] sigaltstack({ss_sp=0x557adff4a600, ss_flags=0, ss_size=65536}, NULL) = 0
[pid 20133] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20133] rt_sigaction(SIGSEGV, {sa_handler=0x557adff1fc70, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|SA_SIGINFO, sa_restorer=0x7fa4febcfa1e}, NULL, 8) = 0
[pid 20133] brk(NULL)                   = 0x557ae1803000
[pid 20133] brk(0x557ae1804000)         = 0x557ae1804000
[pid 20133] brk(0x557ae1805000)         = 0x557ae1805000
[pid 20133] brk(0x557ae1807000)         = 0x557ae1807000
[pid 20133] brk(0x557ae1821000)         = 0x557ae1821000
[pid 20133] fstat(0, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid 20133] lseek(0, 0, SEEK_CUR)       = -1 ESPIPE (Invalid seek)
[pid 20133] read(0, "\nPushkin's\nTeuton's\nprows\nToltec"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 65536
[pid 20126] splice(5, [131072], 7, NULL, 464608, 0 <unfinished ...>
[pid 20133] read(0, "ndcastle\nCallie\nphial\nspecialist"..., 32768) = 32768
[pid 20126] <... splice resumed>)       = 32768
[pid 20126] splice(5, [163840], 7, NULL, 431840, 0 <unfinished ...>
[pid 20133] read(0, "upefaction\ntears\nlaparoscopy\nsuf"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 65536
[pid 20126] splice(5, [229376], 7, NULL, 366304, 0 <unfinished ...>
[pid 20133] read(0, "ption's\nfacilitated\nenfolded\nor\n"..., 32768) = 32768
[pid 20126] <... splice resumed>)       = 32768
[pid 20126] splice(5, [262144], 7, NULL, 333536, 0 <unfinished ...>
[pid 20133] read(0, "ever\ntranquilizing\nAnubis\nConrai"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 65536
[pid 20126] splice(5, [327680], 7, NULL, 268000, 0 <unfinished ...>
[pid 20133] close(1)                    = 0
[pid 20133] close(2)                    = 0
[pid 20133] exit_group(0)               = ?
[pid 20133] +++ exited with 0 +++
[pid 20132] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 20133
[pid 20132] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20133, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
[pid 20132] rt_sigreturn({mask=[]})     = 20133
[pid 20132] wait4(-1, 0x7fff80b0511c, WNOHANG, NULL) = -1 ECHILD (No child process)
[pid 20132] read(10, "", 1024)          = 0
[pid 20132] exit_group(0)               = ?
[pid 20132] +++ exited with 0 +++
[pid 20126] <... splice resumed>)       = -1 EPIPE (Broken pipe)
[pid 20125] <... futex resumed>)        = ? ERESTART_RESTARTBLOCK (Interrupted by signal)
[pid 20126] --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=20125, si_uid=0} ---
[pid 20125] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20132, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
[pid 20125] restart_syscall(<... resuming interrupted futex ...> <unfinished ...>
[pid 20126] rt_sigreturn({mask=[]})     = -1 EPIPE (Broken pipe)
[pid 20126] close(7)                    = 0
[pid 20126] waitid(P_PID, 20132, {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20132, si_uid=0, si_status=0, si_utime=0, si_stime=0}, WEXITED|WNOWAIT, NULL) = 0
[pid 20126] futex(0x7f0e1c559ed0, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 20131] <... futex resumed>)        = 0
[pid 20126] brk(0x55ddbec2c000 <unfinished ...>
[pid 20131] futex(0x7f0e1c559ec0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 20126] <... brk resumed>)          = 0x55ddbec2c000
[pid 20126] futex(0x7f0e1c559ed0, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 20126] futex(0x7f0e1c559ec0, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 20131] <... futex resumed>)        = 0
[pid 20126] futex(0x7f0e1c559ed0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] futex(0x7f0e1c559ec0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 20126] <... futex resumed>)        = 0
[pid 20126] futex(0x7f0e1c559ec0, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 20131] <... futex resumed>)        = 0
[pid 20131] futex(0x7f0e1c559ec0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20126] futex(0x55ddbe81b428, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] <... futex resumed>)        = 0
[pid 20125] <... restart_syscall resumed>) = 0
[pid 20126] <... futex resumed>)        = 1
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 3, {tv_sec=4, tv_nsec=999999697} <unfinished ...>
[pid 20131] close(10 <unfinished ...>
[pid 20126] futex(0x55ddbec288a0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 20131] <... close resumed>)        = 0
[pid 20131] futex(0x55ddbec288a0, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 20126] <... futex resumed>)        = 0
[pid 20126] futex(0x55ddbec288a0, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 20131] close(9 <unfinished ...>
[pid 20126] futex(0x55ddbec28c60, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 20131] <... close resumed>)        = 0
[pid 20131] futex(0x55ddbec28c60, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 20131] close(4 <unfinished ...>
[pid 20126] <... futex resumed>)        = 0
[pid 20126] futex(0x55ddbec28c60, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] <... close resumed>)        = 0
[pid 20126] <... futex resumed>)        = 0
[pid 20131] futex(0x7f0e1c559ed0, FUTEX_WAIT_PRIVATE, 3, {tv_sec=0, tv_nsec=499999379} <unfinished ...>
[pid 20126] futex(0x55ddbec274d0, FUTEX_WAIT_PRIVATE, 1, NULL <unfinished ...>
[pid 20131] <... futex resumed>)        = -1 ETIMEDOUT (Operation timed out)
[pid 20131] futex(0x7f0e1c559df0, FUTEX_WAIT_PRIVATE, 0, {tv_sec=14, tv_nsec=999998699} <unfinished ...>
[pid 20125] <... futex resumed>)        = -1 ETIMEDOUT (Operation timed out)
[pid 20125] ioctl(1, TIOCGWINSZ, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20125] ioctl(1, TIOCGWINSZ, 0x7ffcea4b3b10) = -1 ENOTTY (Not a tty)
[pid 20125] fstat(5, {st_mode=S_IFREG|0600, st_size=595680, ...}) = 0
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600) = -1 EOPNOTSUPP (Not supported)
[pid 20125] open("/tmp/.PPQFW0", O_RDWR|O_CREAT|O_EXCL, 0600) = 4
[pid 20125] unlink("/tmp/.PPQFW0")      = 0
[pid 20125] sendfile(4, 5, [595679] => [595680], 1) = 1
[pid 20125] fstat(4, {st_mode=S_IFREG|0600, st_size=1, ...}) = 0
[pid 20125] futex(0x55ddbec274d0, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 20126] <... futex resumed>)        = 0
[pid 20125] ioctl(1, TIOCGWINSZ, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20126] pipe( <unfinished ...>
[pid 20125] fstat(5,  <unfinished ...>
[pid 20126] <... pipe resumed>[6, 7])   = 0
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=595680, ...}) = 0
[pid 20126] pipe( <unfinished ...>
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600 <unfinished ...>
[pid 20126] <... pipe resumed>[8, 9])   = 0
[pid 20125] <... open resumed>)         = -1 EOPNOTSUPP (Not supported)
[pid 20126] rt_sigprocmask(SIG_BLOCK, ~[],  <unfinished ...>
[pid 20125] open("/tmp/.U5GHW0", O_RDWR|O_CREAT|O_EXCL, 0600 <unfinished ...>
[pid 20126] <... rt_sigprocmask resumed>[], 8) = 0
[pid 20126] fork( <unfinished ...>
[pid 20125] <... open resumed>)         = 10
[pid 20125] unlink("/tmp/.U5GHW0"strace: Process 20134 attached
)      = 0
[pid 20125] sendfile(10, 5, [297839] <unfinished ...>
[pid 20134] gettid( <unfinished ...>
[pid 20126] <... fork resumed>)         = 20134
[pid 20134] <... gettid resumed>)       = 20134
[pid 20126] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20134] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20126] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20134] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20126] close(9 <unfinished ...>
[pid 20134] rt_sigaction(SIGCHLD, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20134] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20126] read(8,  <unfinished ...>
[pid 20125] <... sendfile resumed> => [595680], 297841) = 297841
[pid 20134] rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20125] fstat(10,  <unfinished ...>
[pid 20134] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=297841, ...}) = 0
[pid 20134] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20125] ioctl(1, TIOCGWINSZ <unfinished ...>
[pid 20134] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20125] <... ioctl resumed>, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20134] rt_sigaction(SIGHUP, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20125] fstat(5,  <unfinished ...>
[pid 20134] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=595680, ...}) = 0
[pid 20134] rt_sigaction(SIGPIPE, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600 <unfinished ...>
[pid 20134] <... rt_sigaction resumed>{sa_handler=0x55ddbe810090, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f0e1c5d1a1e}, 8) = 0
[pid 20125] <... open resumed>)         = -1 EOPNOTSUPP (Not supported)
[pid 20134] close(8 <unfinished ...>
[pid 20125] open("/tmp/.N1GHW0", O_RDWR|O_CREAT|O_EXCL, 0600 <unfinished ...>
[pid 20134] <... close resumed>)        = 0
[pid 20134] close(7 <unfinished ...>
[pid 20125] <... open resumed>)         = 9
[pid 20134] <... close resumed>)        = 0
[pid 20125] unlink("/tmp/.N1GHW0" <unfinished ...>
[pid 20134] dup2(6, 0 <unfinished ...>
[pid 20125] <... unlink resumed>)       = 0
[pid 20134] <... dup2 resumed>)         = 0
[pid 20125] sendfile(9, 5, [0] <unfinished ...>
[pid 20134] fcntl(6, F_SETFD, FD_CLOEXEC) = 0
[pid 20134] open("/dev/null", O_WRONLY) = 7
[pid 20134] dup2(7, 1)                  = 1
[pid 20134] close(7 <unfinished ...>
[pid 20125] <... sendfile resumed> => [297839], 297839) = 297839
[pid 20134] <... close resumed>)        = 0
[pid 20125] sendfile(9, 5, [595678] <unfinished ...>
[pid 20134] open("/dev/null", O_WRONLY <unfinished ...>
[pid 20125] <... sendfile resumed> => [595680], 2) = 2
[pid 20134] <... open resumed>)         = 7
[pid 20125] fstat(9,  <unfinished ...>
[pid 20134] dup2(7, 2 <unfinished ...>
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=297841, ...}) = 0
[pid 20134] <... dup2 resumed>)         = 2
[pid 20125] ioctl(1, TIOCGWINSZ <unfinished ...>
[pid 20134] close(7 <unfinished ...>
[pid 20125] <... ioctl resumed>, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20134] <... close resumed>)        = 0
[pid 20125] fstat(5,  <unfinished ...>
[pid 20134] open("/proc/self/fd", O_RDONLY|O_DIRECTORY <unfinished ...>
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=595680, ...}) = 0
[pid 20134] <... open resumed>)         = 7
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600 <unfinished ...>
[pid 20134] getdents64(7,  <unfinished ...>
[pid 20125] <... open resumed>)         = -1 EOPNOTSUPP (Not supported)
[pid 20125] open("/tmp/.Y6EHW0", O_RDWR|O_CREAT|O_EXCL, 0600 <unfinished ...>
[pid 20134] <... getdents64 resumed>0x7f0e1c3b5500 /* 12 entries */, 4096) = 288
[pid 20125] <... open resumed>)         = 11
[pid 20134] fcntl(3, F_SETFD, FD_CLOEXEC <unfinished ...>
[pid 20125] unlink("/tmp/.Y6EHW0")      = 0
[pid 20134] <... fcntl resumed>)        = 0
[pid 20125] sendfile(11, 5, [148919] <unfinished ...>
[pid 20134] fcntl(4, F_SETFD, FD_CLOEXEC <unfinished ...>
[pid 20125] <... sendfile resumed> => [595680], 446761) = 446761
[pid 20134] <... fcntl resumed>)        = 0
[pid 20125] fstat(11,  <unfinished ...>
[pid 20134] fcntl(5, F_SETFD, FD_CLOEXEC <unfinished ...>
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=446761, ...}) = 0
[pid 20134] <... fcntl resumed>)        = 0
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 3, {tv_sec=4, tv_nsec=999999594} <unfinished ...>
[pid 20134] fcntl(6, F_SETFD, FD_CLOEXEC) = 0
[pid 20134] fcntl(9, F_SETFD, FD_CLOEXEC) = 0
[pid 20134] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20134] getdents64(7, 0x7f0e1c3b5500 /* 0 entries */, 4096) = 0
[pid 20134] close(7)                    = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_CPU, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_DATA, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_CORE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_RSS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_NPROC, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=64*1024, rlim_max=64*1024}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_AS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_LOCKS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_SIGPENDING, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_MSGQUEUE, {rlim_cur=800*1024, rlim_max=800*1024}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_NICE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20134] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20134] prlimit64(0, RLIMIT_RTPRIO, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20134] setpgid(0, 0)               = 0
[pid 20134] prctl(PR_SET_PDEATHSIG, SIGTERM) = 0
[pid 20134] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20134] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20134] execve("/bin/grep.sh", ["grep.sh"], 0x55ddbec27c60 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20134] execve("/usr/bin/grep.sh", ["grep.sh"], 0x55ddbec27c60 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20134] execve("./grep.sh", ["grep.sh"], 0x55ddbec27c60 /* 10 vars */ <unfinished ...>
[pid 20126] <... read resumed>"", 8)    = 0
[pid 20134] <... execve resumed>)       = 0
[pid 20134] arch_prctl(ARCH_SET_FS, 0x7f961c323d08 <unfinished ...>
[pid 20126] close(8 <unfinished ...>
[pid 20134] <... arch_prctl resumed>)   = 0
[pid 20126] <... close resumed>)        = 0
[pid 20134] set_tid_address(0x7f961c3242d4 <unfinished ...>
[pid 20126] close(6 <unfinished ...>
[pid 20134] <... set_tid_address resumed>) = 20134
[pid 20126] <... close resumed>)        = 0
[pid 20126] splice(4, [0], 7, NULL, 1, 0 <unfinished ...>
[pid 20134] mprotect(0x7f961c320000, 4096, PROT_READ <unfinished ...>
[pid 20126] <... splice resumed>)       = 1
[pid 20134] <... mprotect resumed>)     = 0
[pid 20126] close(7 <unfinished ...>
[pid 20134] mprotect(0x559b9465e000, 8192, PROT_READ <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20134] <... mprotect resumed>)     = 0
[pid 20126] waitid(P_PID, 20134,  <unfinished ...>
[pid 20134] getpid()                    = 20134
[pid 20134] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20134] rt_sigaction(SIGCHLD, {sa_handler=0x559b94653940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f961c2e9a1e}, NULL, 8) = 0
[pid 20134] geteuid()                   = 0
[pid 20134] getppid()                   = 20125
[pid 20134] stat("/tmp/halfempty/test", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20134] stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20134] open("./grep.sh", O_RDONLY) = 3
[pid 20134] fcntl(3, F_DUPFD, 10)       = 10
[pid 20134] close(3)                    = 0
[pid 20134] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20134] rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20134] rt_sigaction(SIGINT, {sa_handler=0x559b94653940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f961c2e9a1e}, NULL, 8) = 0
[pid 20134] rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20134] rt_sigaction(SIGQUIT, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f961c2e9a1e}, NULL, 8) = 0
[pid 20134] rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20134] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f961c2e9a1e}, NULL, 8) = 0
[pid 20134] read(10, "#!/bin/sh\n# Copyright 2018 Googl"..., 1024) = 686
[pid 20134] stat("/root/.idris2/bin/grep", 0x7ffd72e9c240) = -1 ENOENT (No such file or directory)
[pid 20134] stat("/usr/local/sbin/grep", 0x7ffd72e9c240) = -1 ENOENT (No such file or directory)
[pid 20134] stat("/usr/local/bin/grep", 0x7ffd72e9c240) = -1 ENOENT (No such file or directory)
[pid 20134] stat("/usr/sbin/grep", {st_mode=S_IFREG|0755, st_size=219248, ...}) = 0
[pid 20134] rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1 RT_2], NULL, 8) = 0
[pid 20134] vfork(strace: Process 20135 attached
 <unfinished ...>
[pid 20135] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20135] execve("/usr/sbin/grep", ["grep", "-q", "^bisect$"], 0x559b94660f40 /* 10 vars */ <unfinished ...>
[pid 20134] <... vfork resumed>)        = 20135
[pid 20134] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20135] <... execve resumed>)       = 0
[pid 20134] wait4(-1,  <unfinished ...>
[pid 20135] arch_prctl(ARCH_SET_FS, 0x7ff01db91d08) = 0
[pid 20135] set_tid_address(0x7ff01db922d4) = 20135
[pid 20135] open("/root/.idris2/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20135] open("/etc/ld-musl-x86_64.path", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20135] open("/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
[pid 20135] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20135] fstat(3, {st_mode=S_IFREG|0755, st_size=477040, ...}) = 0
[pid 20135] read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\"\0\0\0\0\0\0"..., 960) = 960
[pid 20135] mmap(NULL, 483328, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7ff01da6a000
[pid 20135] mmap(0x7ff01da6c000, 344064, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0x2000) = 0x7ff01da6c000
[pid 20135] mmap(0x7ff01dac0000, 122880, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0x56000) = 0x7ff01dac0000
[pid 20135] mmap(0x7ff01dade000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x73000) = 0x7ff01dade000
[pid 20135] close(3)                    = 0
[pid 20135] mprotect(0x7ff01dade000, 4096, PROT_READ) = 0
[pid 20135] mprotect(0x7ff01db8e000, 4096, PROT_READ) = 0
[pid 20135] mprotect(0x55b8bec3d000, 4096, PROT_READ) = 0
[pid 20135] sigaltstack({ss_sp=0x55b8bec3e600, ss_flags=0, ss_size=65536}, NULL) = 0
[pid 20135] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20135] rt_sigaction(SIGSEGV, {sa_handler=0x55b8bec13c70, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|SA_SIGINFO, sa_restorer=0x7ff01db57a1e}, NULL, 8) = 0
[pid 20135] brk(NULL)                   = 0x55b8bfb28000
[pid 20135] brk(0x55b8bfb29000)         = 0x55b8bfb29000
[pid 20135] brk(0x55b8bfb2a000)         = 0x55b8bfb2a000
[pid 20135] brk(0x55b8bfb2c000)         = 0x55b8bfb2c000
[pid 20135] brk(0x55b8bfb46000)         = 0x55b8bfb46000
[pid 20135] fstat(0, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid 20135] lseek(0, 0, SEEK_CUR)       = -1 ESPIPE (Invalid seek)
[pid 20135] read(0, "\n", 98304)        = 1
[pid 20135] read(0, "", 98304)          = 0
[pid 20135] close(1)                    = 0
[pid 20135] close(2)                    = 0
[pid 20135] exit_group(1)               = ?
[pid 20135] +++ exited with 1 +++
[pid 20134] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 1}], 0, NULL) = 20135
[pid 20134] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20135, si_uid=0, si_status=1, si_utime=0, si_stime=0} ---
[pid 20134] rt_sigreturn({mask=[]})     = 20135
[pid 20134] wait4(-1, 0x7ffd72e9c2ac, WNOHANG, NULL) = -1 ECHILD (No child process)
[pid 20134] read(10, "", 1024)          = 0
[pid 20134] exit_group(1)               = ?
[pid 20134] +++ exited with 1 +++
[pid 20126] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20134, si_uid=0, si_status=1, si_utime=0, si_stime=0}, WEXITED|WNOWAIT, NULL) = 0
[pid 20126] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20134, si_uid=0, si_status=1, si_utime=0, si_stime=0} ---
[pid 20126] futex(0x7f0e1c559df0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] <... futex resumed>)        = 0
[pid 20126] <... futex resumed>)        = 1
[pid 20131] futex(0x7f0e1c559de0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 20126] futex(0x7f0e1c559de0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid 20131] futex(0x7f0e1c559de0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20126] <... futex resumed>)        = 0
[pid 20131] <... futex resumed>)        = 0
[pid 20126] futex(0x55ddbe81b428, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] kill(-20134, SIGTERM <unfinished ...>
[pid 20125] <... futex resumed>)        = 0
[pid 20126] <... futex resumed>)        = 1
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 4, {tv_sec=4, tv_nsec=999999556} <unfinished ...>
[pid 20131] <... kill resumed>)         = 0
[pid 20126] pipe([6, 7])                = 0
[pid 20131] close(4 <unfinished ...>
[pid 20126] pipe([4, 8])                = 0
[pid 20131] <... close resumed>)        = 0
[pid 20126] rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
[pid 20131] wait4(20134,  <unfinished ...>
[pid 20126] fork( <unfinished ...>
[pid 20131] <... wait4 resumed>NULL, WNOHANG, NULL) = 20134
strace: Process 20136 attached
[pid 20126] <... fork resumed>)         = 20136
[pid 20131] futex(0x7f0e1c559ed0, FUTEX_WAIT_PRIVATE, 3, {tv_sec=0, tv_nsec=499999778} <unfinished ...>
[pid 20136] gettid( <unfinished ...>
[pid 20126] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20136] <... gettid resumed>)       = 20136
[pid 20126] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20126] close(8 <unfinished ...>
[pid 20136] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20126] <... close resumed>)        = 0
[pid 20136] rt_sigaction(SIGCHLD, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20126] read(4,  <unfinished ...>
[pid 20136] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20136] rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20136] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20136] rt_sigaction(SIGHUP, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20136] rt_sigaction(SIGPIPE, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=0x55ddbe810090, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f0e1c5d1a1e}, 8) = 0
[pid 20136] close(4)                    = 0
[pid 20136] close(7)                    = 0
[pid 20136] dup2(6, 0)                  = 0
[pid 20136] fcntl(6, F_SETFD, FD_CLOEXEC) = 0
[pid 20136] open("/dev/null", O_WRONLY) = 4
[pid 20136] dup2(4, 1)                  = 1
[pid 20136] close(4)                    = 0
[pid 20136] open("/dev/null", O_WRONLY) = 4
[pid 20136] dup2(4, 2)                  = 2
[pid 20136] close(4)                    = 0
[pid 20136] open("/proc/self/fd", O_RDONLY|O_DIRECTORY) = 4
[pid 20136] getdents64(4, 0x7f0e1c3b5500 /* 13 entries */, 4096) = 312
[pid 20136] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20136] fcntl(5, F_SETFD, FD_CLOEXEC) = 0
[pid 20136] fcntl(6, F_SETFD, FD_CLOEXEC) = 0
[pid 20136] fcntl(8, F_SETFD, FD_CLOEXEC) = 0
[pid 20136] fcntl(9, F_SETFD, FD_CLOEXEC) = 0
[pid 20136] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20136] fcntl(11, F_SETFD, FD_CLOEXEC) = 0
[pid 20136] getdents64(4, 0x7f0e1c3b5500 /* 0 entries */, 4096) = 0
[pid 20136] close(4)                    = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_CPU, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_DATA, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_CORE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_RSS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_NPROC, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=64*1024, rlim_max=64*1024}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_AS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_LOCKS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_SIGPENDING, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_MSGQUEUE, {rlim_cur=800*1024, rlim_max=800*1024}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_NICE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20136] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20136] prlimit64(0, RLIMIT_RTPRIO, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20136] setpgid(0, 0)               = 0
[pid 20136] prctl(PR_SET_PDEATHSIG, SIGTERM) = 0
[pid 20136] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20136] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20136] execve("/bin/grep.sh", ["grep.sh"], 0x55ddbec29e60 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20136] execve("/usr/bin/grep.sh", ["grep.sh"], 0x55ddbec29e60 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20136] execve("./grep.sh", ["grep.sh"], 0x55ddbec29e60 /* 10 vars */ <unfinished ...>
[pid 20126] <... read resumed>"", 8)    = 0
[pid 20136] <... execve resumed>)       = 0
[pid 20126] close(4 <unfinished ...>
[pid 20136] arch_prctl(ARCH_SET_FS, 0x7f1f431edd08 <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20136] <... arch_prctl resumed>)   = 0
[pid 20126] close(6 <unfinished ...>
[pid 20136] set_tid_address(0x7f1f431ee2d4 <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20136] <... set_tid_address resumed>) = 20136
[pid 20126] splice(10, [0], 7, NULL, 297841, 0 <unfinished ...>
[pid 20136] mprotect(0x7f1f431ea000, 4096, PROT_READ <unfinished ...>
[pid 20126] <... splice resumed>)       = 65536
[pid 20136] <... mprotect resumed>)     = 0
[pid 20126] splice(10, [65536], 7, NULL, 232305, 0 <unfinished ...>
[pid 20136] mprotect(0x557e23414000, 8192, PROT_READ) = 0
[pid 20136] getpid()                    = 20136
[pid 20136] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20136] rt_sigaction(SIGCHLD, {sa_handler=0x557e23409940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f1f431b3a1e}, NULL, 8) = 0
[pid 20136] geteuid()                   = 0
[pid 20136] getppid()                   = 20125
[pid 20136] stat("/tmp/halfempty/test", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20136] stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20136] open("./grep.sh", O_RDONLY) = 3
[pid 20136] fcntl(3, F_DUPFD, 10)       = 10
[pid 20136] close(3)                    = 0
[pid 20136] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20136] rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20136] rt_sigaction(SIGINT, {sa_handler=0x557e23409940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f1f431b3a1e}, NULL, 8) = 0
[pid 20136] rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20136] rt_sigaction(SIGQUIT, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f1f431b3a1e}, NULL, 8) = 0
[pid 20136] rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20136] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f1f431b3a1e}, NULL, 8) = 0
[pid 20136] read(10, "#!/bin/sh\n# Copyright 2018 Googl"..., 1024) = 686
[pid 20136] stat("/root/.idris2/bin/grep", 0x7ffcbe073980) = -1 ENOENT (No such file or directory)
[pid 20136] stat("/usr/local/sbin/grep", 0x7ffcbe073980) = -1 ENOENT (No such file or directory)
[pid 20136] stat("/usr/local/bin/grep", 0x7ffcbe073980) = -1 ENOENT (No such file or directory)
[pid 20136] stat("/usr/sbin/grep", {st_mode=S_IFREG|0755, st_size=219248, ...}) = 0
[pid 20136] rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1 RT_2], NULL, 8) = 0
[pid 20136] vfork(strace: Process 20137 attached
 <unfinished ...>
[pid 20137] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20137] execve("/usr/sbin/grep", ["grep", "-q", "^bisect$"], 0x557e23416f40 /* 10 vars */ <unfinished ...>
[pid 20136] <... vfork resumed>)        = 20137
[pid 20136] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20137] <... execve resumed>)       = 0
[pid 20136] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20137] arch_prctl(ARCH_SET_FS, 0x7f2f1138fd08 <unfinished ...>
[pid 20136] wait4(-1,  <unfinished ...>
[pid 20137] <... arch_prctl resumed>)   = 0
[pid 20137] set_tid_address(0x7f2f113902d4) = 20137
[pid 20137] open("/root/.idris2/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20137] open("/etc/ld-musl-x86_64.path", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20137] open("/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
[pid 20137] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20137] fstat(3, {st_mode=S_IFREG|0755, st_size=477040, ...}) = 0
[pid 20137] read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\"\0\0\0\0\0\0"..., 960) = 960
[pid 20137] mmap(NULL, 483328, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f2f11268000
[pid 20137] mmap(0x7f2f1126a000, 344064, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0x2000) = 0x7f2f1126a000
[pid 20137] mmap(0x7f2f112be000, 122880, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0x56000) = 0x7f2f112be000
[pid 20137] mmap(0x7f2f112dc000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x73000) = 0x7f2f112dc000
[pid 20137] close(3)                    = 0
[pid 20137] mprotect(0x7f2f112dc000, 4096, PROT_READ) = 0
[pid 20137] mprotect(0x7f2f1138c000, 4096, PROT_READ) = 0
[pid 20137] mprotect(0x561601960000, 4096, PROT_READ) = 0
[pid 20137] sigaltstack({ss_sp=0x561601961600, ss_flags=0, ss_size=65536}, NULL) = 0
[pid 20137] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20137] rt_sigaction(SIGSEGV, {sa_handler=0x561601936c70, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|SA_SIGINFO, sa_restorer=0x7f2f11355a1e}, NULL, 8) = 0
[pid 20137] brk(NULL)                   = 0x561602f5e000
[pid 20137] brk(0x561602f5f000)         = 0x561602f5f000
[pid 20137] brk(0x561602f60000)         = 0x561602f60000
[pid 20137] brk(0x561602f62000)         = 0x561602f62000
[pid 20137] brk(0x561602f7c000)         = 0x561602f7c000
[pid 20137] fstat(0, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid 20137] lseek(0, 0, SEEK_CUR)       = -1 ESPIPE (Invalid seek)
[pid 20137] read(0, "rayfish's\npodiums\nmooned\nforesig"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 65536
[pid 20126] splice(10, [131072], 7, NULL, 166769, 0 <unfinished ...>
[pid 20137] read(0, "sam\nmeddler\nquipped\nGore\ndemolis"..., 32768) = 32768
[pid 20126] <... splice resumed>)       = 32768
[pid 20126] splice(10, [163840], 7, NULL, 134001, 0 <unfinished ...>
[pid 20137] read(0, "y\npayers\nDramamines\nabeam\nmicros"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 65536
[pid 20126] splice(10, [229376], 7, NULL, 68465, 0 <unfinished ...>
[pid 20137] read(0, "s\nadministrator's\ndispossession'"..., 32768) = 32768
[pid 20126] <... splice resumed>)       = 32768
[pid 20126] splice(10, [262144], 7, NULL, 35697, 0 <unfinished ...>
[pid 20137] read(0, "s\nsketcher\nSergio's\nintroduced\na"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 35697
[pid 20126] close(7)                    = 0
[pid 20137] read(0,  <unfinished ...>
[pid 20126] waitid(P_PID, 20136,  <unfinished ...>
[pid 20137] <... read resumed>"tt's\npuffiness\nsportier\nHindemit"..., 32768) = 32768
[pid 20137] read(0, "uding\nassigner's\ngigahertz\nSunda"..., 98304) = 2929
[pid 20137] read(0, "", 98304)          = 0
[pid 20137] close(1)                    = 0
[pid 20137] close(2)                    = 0
[pid 20137] exit_group(1)               = ?
[pid 20137] +++ exited with 1 +++
[pid 20136] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 1}], 0, NULL) = 20137
[pid 20136] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20137, si_uid=0, si_status=1, si_utime=0, si_stime=0} ---
[pid 20136] rt_sigreturn({mask=[]})     = 20137
[pid 20136] wait4(-1, 0x7ffcbe0739ec, WNOHANG, NULL) = -1 ECHILD (No child process)
[pid 20136] read(10, "", 1024)          = 0
[pid 20136] exit_group(1)               = ?
[pid 20136] +++ exited with 1 +++
[pid 20126] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20136, si_uid=0, si_status=1, si_utime=0, si_stime=0}, WEXITED|WNOWAIT, NULL) = 0
[pid 20126] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20136, si_uid=0, si_status=1, si_utime=0, si_stime=0} ---
[pid 20126] futex(0x7f0e1c559ed0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] <... futex resumed>)        = 0
[pid 20126] <... futex resumed>)        = 1
[pid 20126] futex(0x55ddbe81b428, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] kill(-20136, SIGTERM <unfinished ...>
[pid 20125] <... futex resumed>)        = 0
[pid 20126] <... futex resumed>)        = 1
[pid 20125] ioctl(1, TIOCGWINSZ <unfinished ...>
[pid 20131] <... kill resumed>)         = 0
[pid 20125] <... ioctl resumed>, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20126] pipe( <unfinished ...>
[pid 20131] close(10 <unfinished ...>
[pid 20126] <... pipe resumed>[4, 6])   = 0
[pid 20126] pipe( <unfinished ...>
[pid 20125] fstat(5,  <unfinished ...>
[pid 20131] <... close resumed>)        = 0
[pid 20126] <... pipe resumed>[7, 8])   = 0
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=595680, ...}) = 0
[pid 20131] wait4(20136,  <unfinished ...>
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600 <unfinished ...>
[pid 20126] rt_sigprocmask(SIG_BLOCK, ~[],  <unfinished ...>
[pid 20131] <... wait4 resumed>NULL, WNOHANG, NULL) = 20136
[pid 20126] <... rt_sigprocmask resumed>[], 8) = 0
[pid 20125] <... open resumed>)         = -1 EOPNOTSUPP (Not supported)
[pid 20131] futex(0x7f0e1c559ed0, FUTEX_WAIT_PRIVATE, 4, {tv_sec=0, tv_nsec=499998877} <unfinished ...>
[pid 20125] open("/tmp/.5DTGW0", O_RDWR|O_CREAT|O_EXCL, 0600 <unfinished ...>
[pid 20126] fork( <unfinished ...>
[pid 20125] <... open resumed>)         = 10
strace: Process 20138 attached
[pid 20125] unlink("/tmp/.5DTGW0" <unfinished ...>
[pid 20138] gettid( <unfinished ...>
[pid 20126] <... fork resumed>)         = 20138
[pid 20125] <... unlink resumed>)       = 0
[pid 20138] <... gettid resumed>)       = 20138
[pid 20126] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20125] sendfile(10, 5, [0] <unfinished ...>
[pid 20138] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20126] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20138] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20126] close(8)                    = 0
[pid 20138] rt_sigaction(SIGCHLD, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20126] read(7,  <unfinished ...>
[pid 20125] <... sendfile resumed> => [148919], 148919) = 148919
[pid 20138] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20125] sendfile(10, 5, [297838] <unfinished ...>
[pid 20138] rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20138] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20138] rt_sigaction(SIGHUP, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20125] <... sendfile resumed> => [595680], 297842) = 297842
[pid 20138] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20125] fstat(10, {st_mode=S_IFREG|0600, st_size=446761, ...}) = 0
[pid 20138] rt_sigaction(SIGPIPE, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=0x55ddbe810090, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f0e1c5d1a1e}, 8) = 0
[pid 20125] ioctl(1, TIOCGWINSZ <unfinished ...>
[pid 20138] close(7)                    = 0
[pid 20125] <... ioctl resumed>, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20138] close(6)                    = 0
[pid 20125] fstat(5,  <unfinished ...>
[pid 20138] dup2(4, 0 <unfinished ...>
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=595680, ...}) = 0
[pid 20138] <... dup2 resumed>)         = 0
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600 <unfinished ...>
[pid 20138] fcntl(4, F_SETFD, FD_CLOEXEC <unfinished ...>
[pid 20125] <... open resumed>)         = -1 EOPNOTSUPP (Not supported)
[pid 20138] <... fcntl resumed>)        = 0
[pid 20138] open("/dev/null", O_WRONLY <unfinished ...>
[pid 20125] open("/tmp/.ETSGW0", O_RDWR|O_CREAT|O_EXCL, 0600 <unfinished ...>
[pid 20138] <... open resumed>)         = 6
[pid 20138] dup2(6, 1)                  = 1
[pid 20138] close(6)                    = 0
[pid 20138] open("/dev/null", O_WRONLY) = 6
[pid 20138] dup2(6, 2)                  = 2
[pid 20138] close(6)                    = 0
[pid 20138] open("/proc/self/fd", O_RDONLY|O_DIRECTORY) = 6
[pid 20138] getdents64(6, 0x7f0e1c3b5500 /* 13 entries */, 4096) = 312
[pid 20138] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20138] fcntl(4, F_SETFD, FD_CLOEXEC) = 0
[pid 20138] fcntl(5, F_SETFD, FD_CLOEXEC) = 0
[pid 20138] fcntl(8, F_SETFD, FD_CLOEXEC) = 0
[pid 20138] fcntl(9, F_SETFD, FD_CLOEXEC) = 0
[pid 20138] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20138] fcntl(11, F_SETFD, FD_CLOEXEC) = 0
[pid 20138] getdents64(6, 0x7f0e1c3b5500 /* 0 entries */, 4096) = 0
[pid 20138] close(6)                    = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_CPU, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_DATA, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2],  <unfinished ...>
[pid 20125] <... open resumed>)         = 8
[pid 20138] <... rt_sigprocmask resumed>[], 8) = 0
[pid 20125] unlink("/tmp/.ETSGW0" <unfinished ...>
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[],  <unfinished ...>
[pid 20125] <... unlink resumed>)       = 0
[pid 20138] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20125] sendfile(8, 5, [0] <unfinished ...>
[pid 20138] prlimit64(0, RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20125] <... sendfile resumed> => [297838], 297838) = 297838
[pid 20138] prlimit64(0, RLIMIT_CORE, {rlim_cur=0, rlim_max=0},  <unfinished ...>
[pid 20125] sendfile(8, 5, [446757] <unfinished ...>
[pid 20138] <... prlimit64 resumed>NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20125] <... sendfile resumed> => [595680], 148923) = 148923
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2],  <unfinished ...>
[pid 20125] fstat(8,  <unfinished ...>
[pid 20138] <... rt_sigprocmask resumed>[], 8) = 0
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=446761, ...}) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[],  <unfinished ...>
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 5, {tv_sec=4, tv_nsec=999998990} <unfinished ...>
[pid 20138] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_RSS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_NPROC, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=64*1024, rlim_max=64*1024}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_AS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_LOCKS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_SIGPENDING, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_MSGQUEUE, {rlim_cur=800*1024, rlim_max=800*1024}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_NICE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20138] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20138] prlimit64(0, RLIMIT_RTPRIO, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20138] setpgid(0, 0)               = 0
[pid 20138] prctl(PR_SET_PDEATHSIG, SIGTERM) = 0
[pid 20138] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20138] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20138] execve("/bin/grep.sh", ["grep.sh"], 0x55ddbec29ea0 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20138] execve("/usr/bin/grep.sh", ["grep.sh"], 0x55ddbec29ea0 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20138] execve("./grep.sh", ["grep.sh"], 0x55ddbec29ea0 /* 10 vars */ <unfinished ...>
[pid 20126] <... read resumed>"", 8)    = 0
[pid 20138] <... execve resumed>)       = 0
[pid 20126] close(7 <unfinished ...>
[pid 20138] arch_prctl(ARCH_SET_FS, 0x7f1f91cb5d08 <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20138] <... arch_prctl resumed>)   = 0
[pid 20126] close(4 <unfinished ...>
[pid 20138] set_tid_address(0x7f1f91cb62d4 <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20138] <... set_tid_address resumed>) = 20138
[pid 20126] splice(9, [0], 6, NULL, 297841, 0 <unfinished ...>
[pid 20138] mprotect(0x7f1f91cb2000, 4096, PROT_READ <unfinished ...>
[pid 20126] <... splice resumed>)       = 65536
[pid 20138] <... mprotect resumed>)     = 0
[pid 20126] splice(9, [65536], 6, NULL, 232305, 0 <unfinished ...>
[pid 20138] mprotect(0x5628c8e2a000, 8192, PROT_READ) = 0
[pid 20138] getpid()                    = 20138
[pid 20138] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20138] rt_sigaction(SIGCHLD, {sa_handler=0x5628c8e1f940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f1f91c7ba1e}, NULL, 8) = 0
[pid 20138] geteuid()                   = 0
[pid 20138] getppid()                   = 20125
[pid 20138] stat("/tmp/halfempty/test", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20138] stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20138] open("./grep.sh", O_RDONLY) = 3
[pid 20138] fcntl(3, F_DUPFD, 10)       = 10
[pid 20138] close(3)                    = 0
[pid 20138] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20138] rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20138] rt_sigaction(SIGINT, {sa_handler=0x5628c8e1f940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f1f91c7ba1e}, NULL, 8) = 0
[pid 20138] rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20138] rt_sigaction(SIGQUIT, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f1f91c7ba1e}, NULL, 8) = 0
[pid 20138] rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20138] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f1f91c7ba1e}, NULL, 8) = 0
[pid 20138] read(10, "#!/bin/sh\n# Copyright 2018 Googl"..., 1024) = 686
[pid 20138] stat("/root/.idris2/bin/grep", 0x7ffe037df760) = -1 ENOENT (No such file or directory)
[pid 20138] stat("/usr/local/sbin/grep", 0x7ffe037df760) = -1 ENOENT (No such file or directory)
[pid 20138] stat("/usr/local/bin/grep", 0x7ffe037df760) = -1 ENOENT (No such file or directory)
[pid 20138] stat("/usr/sbin/grep", {st_mode=S_IFREG|0755, st_size=219248, ...}) = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1 RT_2], NULL, 8) = 0
[pid 20138] vfork(strace: Process 20139 attached
 <unfinished ...>
[pid 20139] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20139] execve("/usr/sbin/grep", ["grep", "-q", "^bisect$"], 0x5628c8e2cf40 /* 10 vars */ <unfinished ...>
[pid 20138] <... vfork resumed>)        = 20139
[pid 20139] <... execve resumed>)       = 0
[pid 20138] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20139] arch_prctl(ARCH_SET_FS, 0x7f17ad72dd08 <unfinished ...>
[pid 20138] wait4(-1,  <unfinished ...>
[pid 20139] <... arch_prctl resumed>)   = 0
[pid 20139] set_tid_address(0x7f17ad72e2d4) = 20139
[pid 20139] open("/root/.idris2/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20139] open("/etc/ld-musl-x86_64.path", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20139] open("/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
[pid 20139] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20139] fstat(3, {st_mode=S_IFREG|0755, st_size=477040, ...}) = 0
[pid 20139] read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\"\0\0\0\0\0\0"..., 960) = 960
[pid 20139] mmap(NULL, 483328, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f17ad606000
[pid 20139] mmap(0x7f17ad608000, 344064, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0x2000) = 0x7f17ad608000
[pid 20139] mmap(0x7f17ad65c000, 122880, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0x56000) = 0x7f17ad65c000
[pid 20139] mmap(0x7f17ad67a000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x73000) = 0x7f17ad67a000
[pid 20139] close(3)                    = 0
[pid 20139] mprotect(0x7f17ad67a000, 4096, PROT_READ) = 0
[pid 20139] mprotect(0x7f17ad72a000, 4096, PROT_READ) = 0
[pid 20139] mprotect(0x560358ddd000, 4096, PROT_READ) = 0
[pid 20139] sigaltstack({ss_sp=0x560358dde600, ss_flags=0, ss_size=65536}, NULL) = 0
[pid 20139] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20139] rt_sigaction(SIGSEGV, {sa_handler=0x560358db3c70, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|SA_SIGINFO, sa_restorer=0x7f17ad6f3a1e}, NULL, 8) = 0
[pid 20139] brk(NULL)                   = 0x56035a8f5000
[pid 20139] brk(0x56035a8f6000)         = 0x56035a8f6000
[pid 20139] brk(0x56035a8f7000)         = 0x56035a8f7000
[pid 20139] brk(0x56035a8f9000)         = 0x56035a8f9000
[pid 20139] brk(0x56035a913000)         = 0x56035a913000
[pid 20139] fstat(0, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid 20139] lseek(0, 0, SEEK_CUR)       = -1 ESPIPE (Invalid seek)
[pid 20139] read(0, "\nPushkin's\nTeuton's\nprows\nToltec"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 65536
[pid 20126] splice(9, [131072], 6, NULL, 166769, 0 <unfinished ...>
[pid 20139] read(0, "ndcastle\nCallie\nphial\nspecialist"..., 32768) = 32768
[pid 20126] <... splice resumed>)       = 32768
[pid 20126] splice(9, [163840], 6, NULL, 134001, 0 <unfinished ...>
[pid 20139] read(0, "upefaction\ntears\nlaparoscopy\nsuf"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 65536
[pid 20126] splice(9, [229376], 6, NULL, 68465, 0 <unfinished ...>
[pid 20139] read(0, "ption's\nfacilitated\nenfolded\nor\n"..., 32768) = 32768
[pid 20126] <... splice resumed>)       = 32768
[pid 20126] splice(9, [262144], 6, NULL, 35697, 0 <unfinished ...>
[pid 20139] read(0, "ever\ntranquilizing\nAnubis\nConrai"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 35697
[pid 20139] close(1 <unfinished ...>
[pid 20126] close(6 <unfinished ...>
[pid 20139] <... close resumed>)        = 0
[pid 20126] <... close resumed>)        = 0
[pid 20139] close(2)                    = 0
[pid 20126] waitid(P_PID, 20138,  <unfinished ...>
[pid 20139] exit_group(0)               = ?
[pid 20139] +++ exited with 0 +++
[pid 20138] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 20139
[pid 20138] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20139, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
[pid 20138] rt_sigreturn({mask=[]})     = 20139
[pid 20138] wait4(-1, 0x7ffe037df7cc, WNOHANG, NULL) = -1 ECHILD (No child process)
[pid 20138] read(10, "", 1024)          = 0
[pid 20138] exit_group(0)               = ?
[pid 20138] +++ exited with 0 +++
[pid 20126] <... waitid resumed>{si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20138, si_uid=0, si_status=0, si_utime=0, si_stime=0}, WEXITED|WNOWAIT, NULL) = 0
[pid 20126] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20138, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
[pid 20126] futex(0x7f0e1c559ed0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] <... futex resumed>)        = 0
[pid 20126] <... futex resumed>)        = 1
[pid 20126] futex(0x7f0e1c559ed0, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 20126] futex(0x7f0e1c559ed0, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 20131] futex(0x7f0e1c559ec0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 20126] futex(0x7f0e1c559ec0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid 20126] <... futex resumed>)        = 0
[pid 20126] futex(0x55ddbe81b428, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20125] <... futex resumed>)        = 0
[pid 20126] <... futex resumed>)        = 1
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 6, {tv_sec=4, tv_nsec=999999040} <unfinished ...>
[pid 20131] futex(0x7f0e1c559ec0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20126] pipe( <unfinished ...>
[pid 20131] <... futex resumed>)        = 0
[pid 20126] <... pipe resumed>[4, 6])   = 0
[pid 20126] pipe( <unfinished ...>
[pid 20131] futex(0x55ddbec296e0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 20126] <... pipe resumed>[7, 12])  = 0
[pid 20126] rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
[pid 20126] fork(strace: Process 20140 attached
)                      = 20140
[pid 20140] gettid( <unfinished ...>
[pid 20126] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20140] <... gettid resumed>)       = 20140
[pid 20126] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20126] close(12 <unfinished ...>
[pid 20140] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20140] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20126] read(7,  <unfinished ...>
[pid 20140] rt_sigaction(SIGCHLD, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20140] rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20140] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20140] rt_sigaction(SIGHUP, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20140] rt_sigaction(SIGPIPE, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e}, {sa_handler=0x55ddbe810090, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f0e1c5d1a1e}, 8) = 0
[pid 20140] close(7)                    = 0
[pid 20140] close(6)                    = 0
[pid 20140] dup2(4, 0)                  = 0
[pid 20140] fcntl(4, F_SETFD, FD_CLOEXEC) = 0
[pid 20140] open("/dev/null", O_WRONLY) = 6
[pid 20140] dup2(6, 1)                  = 1
[pid 20140] close(6)                    = 0
[pid 20140] open("/dev/null", O_WRONLY) = 6
[pid 20140] dup2(6, 2)                  = 2
[pid 20140] close(6)                    = 0
[pid 20140] open("/proc/self/fd", O_RDONLY|O_DIRECTORY) = 6
[pid 20140] getdents64(6, 0x7f0e1c3b5500 /* 14 entries */, 4096) = 336
[pid 20140] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20140] fcntl(4, F_SETFD, FD_CLOEXEC) = 0
[pid 20140] fcntl(5, F_SETFD, FD_CLOEXEC) = 0
[pid 20140] fcntl(8, F_SETFD, FD_CLOEXEC) = 0
[pid 20140] fcntl(9, F_SETFD, FD_CLOEXEC) = 0
[pid 20140] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20140] fcntl(11, F_SETFD, FD_CLOEXEC) = 0
[pid 20140] fcntl(12, F_SETFD, FD_CLOEXEC) = 0
[pid 20140] getdents64(6, 0x7f0e1c3b5500 /* 0 entries */, 4096) = 0
[pid 20140] close(6)                    = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_CPU, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_DATA, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_CORE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_RSS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_NPROC, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=64*1024, rlim_max=64*1024}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_AS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_LOCKS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_SIGPENDING, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_MSGQUEUE, {rlim_cur=800*1024, rlim_max=800*1024}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_NICE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20140] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20140] prlimit64(0, RLIMIT_RTPRIO, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20140] setpgid(0, 0)               = 0
[pid 20140] prctl(PR_SET_PDEATHSIG, SIGTERM) = 0
[pid 20140] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20140] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20140] execve("/bin/grep.sh", ["grep.sh"], 0x55ddbec29f40 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20140] execve("/usr/bin/grep.sh", ["grep.sh"], 0x55ddbec29f40 /* 10 vars */) = -1 ENOENT (No such file or directory)
[pid 20140] execve("./grep.sh", ["grep.sh"], 0x55ddbec29f40 /* 10 vars */ <unfinished ...>
[pid 20126] <... read resumed>"", 8)    = 0
[pid 20140] <... execve resumed>)       = 0
[pid 20126] close(7)                    = 0
[pid 20140] arch_prctl(ARCH_SET_FS, 0x7f3229de1d08 <unfinished ...>
[pid 20126] close(4 <unfinished ...>
[pid 20140] <... arch_prctl resumed>)   = 0
[pid 20140] set_tid_address(0x7f3229de22d4 <unfinished ...>
[pid 20126] <... close resumed>)        = 0
[pid 20140] <... set_tid_address resumed>) = 20140
[pid 20126] splice(11, [0], 6, NULL, 446761, 0 <unfinished ...>
[pid 20140] mprotect(0x7f3229dde000, 4096, PROT_READ <unfinished ...>
[pid 20126] <... splice resumed>)       = 65536
[pid 20140] <... mprotect resumed>)     = 0
[pid 20126] splice(11, [65536], 6, NULL, 381225, 0 <unfinished ...>
[pid 20140] mprotect(0x562aa80d2000, 8192, PROT_READ) = 0
[pid 20140] getpid()                    = 20140
[pid 20140] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20140] rt_sigaction(SIGCHLD, {sa_handler=0x562aa80c7940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f3229da7a1e}, NULL, 8) = 0
[pid 20140] geteuid()                   = 0
[pid 20140] getppid()                   = 20125
[pid 20140] stat("/tmp/halfempty/test", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20140] stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
[pid 20140] open("./grep.sh", O_RDONLY) = 3
[pid 20140] fcntl(3, F_DUPFD, 10)       = 10
[pid 20140] close(3)                    = 0
[pid 20140] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20140] rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20140] rt_sigaction(SIGINT, {sa_handler=0x562aa80c7940, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f3229da7a1e}, NULL, 8) = 0
[pid 20140] rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20140] rt_sigaction(SIGQUIT, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f3229da7a1e}, NULL, 8) = 0
[pid 20140] rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20140] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=~[RTMIN RT_1 RT_2], sa_flags=SA_RESTORER, sa_restorer=0x7f3229da7a1e}, NULL, 8) = 0
[pid 20140] read(10, "#!/bin/sh\n# Copyright 2018 Googl"..., 1024) = 686
[pid 20140] stat("/root/.idris2/bin/grep", 0x7fff67dbd4c0) = -1 ENOENT (No such file or directory)
[pid 20140] stat("/usr/local/sbin/grep", 0x7fff67dbd4c0) = -1 ENOENT (No such file or directory)
[pid 20140] stat("/usr/local/bin/grep", 0x7fff67dbd4c0) = -1 ENOENT (No such file or directory)
[pid 20140] stat("/usr/sbin/grep", {st_mode=S_IFREG|0755, st_size=219248, ...}) = 0
[pid 20140] rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1 RT_2], NULL, 8) = 0
[pid 20140] vfork(strace: Process 20141 attached
 <unfinished ...>
[pid 20141] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20141] execve("/usr/sbin/grep", ["grep", "-q", "^bisect$"], 0x562aa80d4f40 /* 10 vars */ <unfinished ...>
[pid 20140] <... vfork resumed>)        = 20141
[pid 20140] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20141] <... execve resumed>)       = 0
[pid 20140] wait4(-1,  <unfinished ...>
[pid 20141] arch_prctl(ARCH_SET_FS, 0x7f33fccc9d08) = 0
[pid 20141] set_tid_address(0x7f33fccca2d4) = 20141
[pid 20141] open("/root/.idris2/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20141] open("/etc/ld-musl-x86_64.path", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 20141] open("/lib/libpcre.so.1", O_RDONLY|O_CLOEXEC) = 3
[pid 20141] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20141] fstat(3, {st_mode=S_IFREG|0755, st_size=477040, ...}) = 0
[pid 20141] read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\"\0\0\0\0\0\0"..., 960) = 960
[pid 20141] mmap(NULL, 483328, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f33fcba2000
[pid 20141] mmap(0x7f33fcba4000, 344064, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0x2000) = 0x7f33fcba4000
[pid 20141] mmap(0x7f33fcbf8000, 122880, PROT_READ, MAP_PRIVATE|MAP_FIXED, 3, 0x56000) = 0x7f33fcbf8000
[pid 20141] mmap(0x7f33fcc16000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x73000) = 0x7f33fcc16000
[pid 20141] close(3)                    = 0
[pid 20141] mprotect(0x7f33fcc16000, 4096, PROT_READ) = 0
[pid 20141] mprotect(0x7f33fccc6000, 4096, PROT_READ) = 0
[pid 20141] mprotect(0x5611d5741000, 4096, PROT_READ) = 0
[pid 20141] sigaltstack({ss_sp=0x5611d5742600, ss_flags=0, ss_size=65536}, NULL) = 0
[pid 20141] rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
[pid 20141] rt_sigaction(SIGSEGV, {sa_handler=0x5611d5717c70, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_NODEFER|SA_RESETHAND|SA_SIGINFO, sa_restorer=0x7f33fcc8fa1e}, NULL, 8) = 0
[pid 20141] brk(NULL)                   = 0x5611d7337000
[pid 20141] brk(0x5611d7338000)         = 0x5611d7338000
[pid 20141] brk(0x5611d7339000)         = 0x5611d7339000
[pid 20141] brk(0x5611d733b000)         = 0x5611d733b000
[pid 20141] brk(0x5611d7355000)         = 0x5611d7355000
[pid 20141] fstat(0, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid 20141] lseek(0, 0, SEEK_CUR)       = -1 ESPIPE (Invalid seek)
[pid 20141] read(0, "d\naddend\nplaints\nCPA's\noffend\nco"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 65536
[pid 20126] splice(11, [131072], 6, NULL, 315689, 0 <unfinished ...>
[pid 20141] read(0, "utfacing\nether's\nfiber's\nscupper"..., 32768) = 32768
[pid 20126] <... splice resumed>)       = 32768
[pid 20126] splice(11, [163840], 6, NULL, 282921, 0 <unfinished ...>
[pid 20141] read(0, "riphery\npriggish\nManx\nCarbonifer"..., 98304) = 65536
[pid 20126] <... splice resumed>)       = 65536
[pid 20141] close(1 <unfinished ...>
[pid 20126] splice(11, [229376], 6, NULL, 217385, 0 <unfinished ...>
[pid 20141] <... close resumed>)        = 0
[pid 20141] close(2)                    = 0
[pid 20141] exit_group(0)               = ?
[pid 20141] +++ exited with 0 +++
[pid 20140] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 20141
[pid 20140] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20141, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
[pid 20140] rt_sigreturn({mask=[]})     = 20141
[pid 20140] wait4(-1, 0x7fff67dbd52c, WNOHANG, NULL) = -1 ECHILD (No child process)
[pid 20140] read(10, "", 1024)          = 0
[pid 20140] exit_group(0)               = ?
[pid 20140] +++ exited with 0 +++
[pid 20126] <... splice resumed>)       = -1 EPIPE (Broken pipe)
[pid 20125] <... futex resumed>)        = ? ERESTART_RESTARTBLOCK (Interrupted by signal)
[pid 20126] --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=20125, si_uid=0} ---
[pid 20125] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20140, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
[pid 20126] rt_sigreturn({mask=[]} <unfinished ...>
[pid 20125] restart_syscall(<... resuming interrupted futex ...> <unfinished ...>
[pid 20126] <... rt_sigreturn resumed>) = -1 EPIPE (Broken pipe)
[pid 20126] close(6)                    = 0
[pid 20126] waitid(P_PID, 20140, {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20140, si_uid=0, si_status=0, si_utime=0, si_stime=0}, WEXITED|WNOWAIT, NULL) = 0
[pid 20126] futex(0x55ddbec296e0, FUTEX_WAKE_PRIVATE, 1) = 1
[pid 20131] <... futex resumed>)        = 0
[pid 20126] futex(0x55ddbe81b428, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20131] close(11 <unfinished ...>
[pid 20125] <... restart_syscall resumed>) = 0
[pid 20126] <... futex resumed>)        = 1
[pid 20125] ioctl(1, TIOCGWINSZ <unfinished ...>
[pid 20126] pipe( <unfinished ...>
[pid 20125] <... ioctl resumed>, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20126] <... pipe resumed>[4, 6])   = 0
[pid 20125] ioctl(1, TIOCGWINSZ, 0x7ffcea4b3b10) = -1 ENOTTY (Not a tty)
[pid 20126] pipe( <unfinished ...>
[pid 20131] <... close resumed>)        = 0
[pid 20126] <... pipe resumed>[7, 11])  = 0
[pid 20125] fstat(9,  <unfinished ...>
[pid 20131] wait4(20140,  <unfinished ...>
[pid 20126] rt_sigprocmask(SIG_BLOCK, ~[],  <unfinished ...>
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=297841, ...}) = 0
[pid 20131] <... wait4 resumed>NULL, WNOHANG, NULL) = 20140
[pid 20126] <... rt_sigprocmask resumed>[], 8) = 0
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600 <unfinished ...>
[pid 20131] futex(0x55ddbec296e0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 20126] fork( <unfinished ...>
[pid 20125] <... open resumed>)         = -1 EOPNOTSUPP (Not supported)
[pid 20131] <... futex resumed>)        = 0
[pid 20125] open("/tmp/.9KYIW0", O_RDWR|O_CREAT|O_EXCL, 0600strace: Process 20142 attached
 <unfinished ...>
[pid 20142] gettid( <unfinished ...>
[pid 20126] <... fork resumed>)         = 20142
[pid 20142] <... gettid resumed>)       = 20142
[pid 20131] futex(0x55ddbec297c0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 20125] <... open resumed>)         = 12
[pid 20142] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20126] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 20125] unlink("/tmp/.9KYIW0" <unfinished ...>
[pid 20142] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20126] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 20125] <... unlink resumed>)       = 0
[pid 20142] rt_sigaction(SIGCHLD, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20126] close(11 <unfinished ...>
[pid 20125] sendfile(12, 9, [148919] <unfinished ...>
[pid 20142] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20126] <... close resumed>)        = 0
[pid 20142] rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20126] read(7,  <unfinished ...>
[pid 20142] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20142] rt_sigaction(SIGTERM, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20125] <... sendfile resumed> => [297841], 148922) = 148922
[pid 20142] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20125] fstat(12,  <unfinished ...>
[pid 20142] rt_sigaction(SIGHUP, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=148922, ...}) = 0
[pid 20142] <... rt_sigaction resumed>{sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
[pid 20125] ioctl(1, TIOCGWINSZ <unfinished ...>
[pid 20142] rt_sigaction(SIGPIPE, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f0e1c5d1a1e},  <unfinished ...>
[pid 20125] <... ioctl resumed>, 0x7ffcea4b3c50) = -1 ENOTTY (Not a tty)
[pid 20142] <... rt_sigaction resumed>{sa_handler=0x55ddbe810090, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f0e1c5d1a1e}, 8) = 0
[pid 20125] fstat(9,  <unfinished ...>
[pid 20142] close(7 <unfinished ...>
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=297841, ...}) = 0
[pid 20142] <... close resumed>)        = 0
[pid 20125] open("/tmp", O_RDWR|O_TMPFILE, 0600 <unfinished ...>
[pid 20142] close(6 <unfinished ...>
[pid 20125] <... open resumed>)         = -1 EOPNOTSUPP (Not supported)
[pid 20142] <... close resumed>)        = 0
[pid 20125] open("/tmp/.YLXIW0", O_RDWR|O_CREAT|O_EXCL, 0600 <unfinished ...>
[pid 20142] dup2(4, 0 <unfinished ...>
[pid 20125] <... open resumed>)         = 11
[pid 20125] unlink("/tmp/.YLXIW0")      = 0
[pid 20125] sendfile(11, 9, [0] <unfinished ...>
[pid 20142] <... dup2 resumed>)         = 0
[pid 20142] fcntl(4, F_SETFD, FD_CLOEXEC <unfinished ...>
[pid 20125] <... sendfile resumed> => [148919], 148919) = 148919
[pid 20142] <... fcntl resumed>)        = 0
[pid 20125] sendfile(11, 9, [297838] <unfinished ...>
[pid 20142] open("/dev/null", O_WRONLY <unfinished ...>
[pid 20125] <... sendfile resumed> => [297841], 3) = 3
[pid 20142] <... open resumed>)         = 6
[pid 20125] fstat(11,  <unfinished ...>
[pid 20142] dup2(6, 1 <unfinished ...>
[pid 20125] <... fstat resumed>{st_mode=S_IFREG|0600, st_size=148922, ...}) = 0
[pid 20142] <... dup2 resumed>)         = 1
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 7, {tv_sec=4, tv_nsec=999999560} <unfinished ...>
[pid 20142] close(6)                    = 0
[pid 20142] open("/dev/null", O_WRONLY) = 6
[pid 20142] dup2(6, 2)                  = 2
[pid 20142] close(6)                    = 0
[pid 20142] open("/proc/self/fd", O_RDONLY|O_DIRECTORY) = 6
[pid 20142] getdents64(6, 0x7f0e1c3b5500 /* 13 entries */, 4096) = 312
[pid 20142] fcntl(3, F_SETFD, FD_CLOEXEC) = 0
[pid 20142] fcntl(4, F_SETFD, FD_CLOEXEC) = 0
[pid 20142] fcntl(5, F_SETFD, FD_CLOEXEC) = 0
[pid 20142] fcntl(8, F_SETFD, FD_CLOEXEC) = 0
[pid 20142] fcntl(9, F_SETFD, FD_CLOEXEC) = 0
[pid 20142] fcntl(10, F_SETFD, FD_CLOEXEC) = 0
[pid 20142] fcntl(11, F_SETFD, FD_CLOEXEC) = 0
[pid 20142] getdents64(6, 0x7f0e1c3b5500 /* 0 entries */, 4096) = 0
[pid 20142] close(6)                    = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_CPU, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_DATA, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_CORE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_RSS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_NPROC, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=4*1024, rlim_max=4*1024}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=64*1024, rlim_max=64*1024}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_AS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_LOCKS, {rlim_cur=RLIM64_INFINITY, rlim_max=RLIM64_INFINITY}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_SIGPENDING, {rlim_cur=62081, rlim_max=62081}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_MSGQUEUE, {rlim_cur=800*1024, rlim_max=800*1024}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_NICE, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1 RT_2], [], 8) = 0
[pid 20142] rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0
[pid 20142] prlimit64(0, RLIMIT_RTPRIO, {rlim_cur=0, rlim_max=0}, NULL) = 0
[pid 20142] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 20142] setpgid(0, 0)               = 0
[pid 20142] prctl(PR_SET_PDEATHSIG, SIGTERM) = 0
[pid 20142] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20142] personality(0xffffffff)     = -1 EPERM (Operation not permitted)
[pid 20142] futex(0x7f0e1c609b80, FUTEX_WAIT_PRIVATE, 1, NULL <unfinished ...>
[pid 20125] <... futex resumed>)        = -1 ETIMEDOUT (Operation timed out)
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 7, {tv_sec=4, tv_nsec=999999207}) = -1 ETIMEDOUT (Operation timed out)
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 7, {tv_sec=4, tv_nsec=999999336}) = -1 ETIMEDOUT (Operation timed out)
[pid 20125] futex(0x55ddbe81b428, FUTEX_WAIT_PRIVATE, 7, {tv_sec=4, tv_nsec=999998925}

(The EPERM may be due to docker.)

[Hello71]

hm, it could actually be the setenv. try commenting that out and trying again.

[taviso]

It still hangs even without child_setup routine, I can reproduce here. I should rework some of that code, but I think that's not the problem here...

[taviso]

I really think the problem is related to not getting a SIGPIPE that I think I should be getting. I'm sure either me or glib is relying on some non-standard glibc behavior, if I knew which behaviour that was I'd fix it :)

I'll try to make a minimal reproducer today.

[Hello71]

fwiw, everything works on Alpine Linux edge with patched words file and removed unnecessary bashisms in complex.sh.