matrix: bump LLVM version from 18 to 20

Signed-off-by: Ihor Solodrai <[email protected]>

Author: theihor

.github/scripts/matrix.py

@@ -1,12 +1,13 @@
 #!/usr/bin/env python3
 
-import os
 import dataclasses
 import json
-import requests
+import os
 
 from enum import Enum
-from typing import Any, Dict, List, Final, Set, Union, Optional
+from typing import Any, Dict, Final, List, Optional, Set, Union
+
+import requests
 
 MANAGED_OWNER: Final[str] = "kernel-patches"
 MANAGED_REPOS: Final[Set[str]] = {
@@ -17,7 +18,7 @@
 DEFAULT_SELF_HOSTED_RUNNER_TAGS: Final[List[str]] = ["self-hosted", "docker-noble-main"]
 DEFAULT_GITHUB_HOSTED_RUNNER: Final[str] = "ubuntu-24.04"
 DEFAULT_GCC_VERSION: Final[int] = 14
-DEFAULT_LLVM_VERSION: Final[int] = 18
+DEFAULT_LLVM_VERSION: Final[int] = 20
 
 RUNNERS_BUSY_THRESHOLD: Final[float] = 0.8
 

ci/vmtest/configs/DENYLIST

@@ -5,7 +5,6 @@ core_reloc/enum64val
 core_reloc/size___diff_sz
 core_reloc/type_based___diff_sz
 test_ima	# All of CI is broken on it following 6.3-rc1 merge
-
 lwt_reroute      # crashes kernel after netnext merge from 2ab1efad60ad "net/sched: cls_api: complement tcf_tfilter_dump_policy"
 tc_links_ingress # started failing after net-next merge from 2ab1efad60ad "net/sched: cls_api: complement tcf_tfilter_dump_policy"
 xdp_bonding/xdp_bonding_features     # started failing after net merge from 359e54a93ab4 "l2tp: pass correct message length to ip6_append_data"
@@ -14,3 +13,4 @@ migrate_reuseport/IPv4 TCP_NEW_SYN_RECV reqsk_timer_handler # flaky, under inves
 migrate_reuseport/IPv6 TCP_NEW_SYN_RECV reqsk_timer_handler # flaky, under investigation
 connect_force_port # unreliably fails
 sockmap_ktls/sockmap_ktls disconnect_after_delete* # https://lore.kernel.org/bpf/[email protected]/
+verif_scale_pyperf600 # llvm 20 generates code that fails verification

ci/vmtest/configs/DENYLIST.test_progs_cpuv4

@@ -0,0 +1,2 @@
+arena_spin_lock # llvm 20 generates code that fails verification
+verifier_arena/basic_alloc2