Missing include path caused cpptools-srv to grow to 5.5G. Only 400MB needed after missing path was added.

[psclkhoury]

Type: LanguageService

Intellisense is not working in a certain file. I don't know the cause yet so I am not able to make a simple repro.

I see in the logging

Failed to read response from server: 20
Resetting IntelliSense server: C:\SOMEFILE.CPP

In the extension host logging, I see

[2020-11-02 15:37:49.425] [exthost] [error] onWillSaveTextDocument-listener from extension 'ms-vscode.cpptools' threw ERROR
[2020-11-02 15:37:49.425] [exthost] [error] Error: timeout
	at Timeout._onTimeout (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\services\extensions\node\extensionHostProcess.js:638:581)
	at listOnTimeout (internal/timers.js:531:17)
	at processTimers (internal/timers.js:475:7)

But I get this message when opening most files so I dont think this is the cause.

Is there a way that I can get more info/logging on what is causing it to fail?

Extension Version 1.1.0-insiders3: October 22, 2020

Version: 1.50.1 (system setup)
Commit: d2e414d9e4239a252d1ab117bd7067f125afd80a
Date: 2020-10-13T15:06:15.712Z
Electron: 9.2.1
Chrome: 83.0.4103.122
Node.js: 12.14.1
V8: 8.3.110.13-electron.0
OS: Windows_NT x64 10.0.17763

[sean-mcmanus]

Can you attach a debugger to cpptools-srv.exe to get a crash call stack (see https://github.com/microsoft/vscode-cpptools/wiki/Attaching-debugger-to-cpptools-or-cpptools%E2%80%90srv ). Info from C/C++: Log Diagnostics might also help.

[psclkhoury]

Here is the callstack:

KernelBase.dll!_RaiseException@16�() (Unknown Source:0)
cpptools-srv.exe!__CxxThrowException@8�() (Unknown Source:0)
cpptools-srv.exe!__scrt_throw_std_bad_alloc(void) (Unknown Source:0)
0388f4f0() (Unknown Source:0)
[Frames below may be incorrect and/or missing] (Unknown Source:0)
cpptools-srv.exe!edge::file_buffer::open(char const *,struct snapshot::snapshot_session_t,enum msvc::buffer_kind_e,struct a_canonicalized_file_name *) (Unknown Source:0)
cpptools-srv.exe!edge::file_buffer::open(char const *,enum msvc::buffer_kind_e) (Unknown Source:0)
cpptools-srv.exe!a_file_buffer_stream::create(char const *) (Unknown Source:0)
cpptools-srv.exe!open_input_stream(char const *) (Unknown Source:0)
cpptools-srv.exe!open_input_stream_with_result(char const *,char const *,struct an_open_file_result *) (Unknown Source:0)
cpptools-srv.exe!open_source_file(char const *,struct an_open_file_result *,enum a_unicode_source_kind_tag *) (Unknown Source:0)
cpptools-srv.exe!open_source_file_with_error_handling(char const *,int,struct an_open_file_result *,enum a_unicode_source_kind_tag *) (Unknown Source:0)
cpptools-srv.exe!try_to_open_source_file_if_not_already_included() (Unknown Source:0)
cpptools-srv.exe!search_for_input_file() (Unknown Source:0)
cpptools-srv.exe!open_file_for_input_full(char const *,int,int,int,int,int,int,int,int,int,char const *,char const * *,char const * *,char const * *,struct an_input_stream * *,int *,enum a_unicode_source_kind_tag *,struct a_directory_name_entry * *) (Unknown Source:0)
cpptools-srv.exe!open_file_and_push_input_stack(char const *,int,int,int,int,int,int,int,int,int *,int,int,int,char const *,char const * *) (Unknown Source:0)
cpptools-srv.exe!proc_include() (Unknown Source:0)
cpptools-srv.exe!pp_directive(void) (Unknown Source:0)
cpptools-srv.exe!get_token(void) (Unknown Source:0)
cpptools-srv.exe!scan_nonmember_declaration(struct a_decl_parse_state *,struct a_source_range *) (Unknown Source:0)

I also saw this in the debug console, looks related:

WER/CrashAPI:2658: ERROR Invalid args, too  big block

[sean-mcmanus]

Thanks for the call stack. We've been able to locate the line of code that is crashing.

[sean-mcmanus]

Actually, it looks like we identified a different null reference but this is a bad_alloc, which I don't see the cause for. Do you have any more repro details in regards to what is special about that particular file, such as any particular file encoding?

[psclkhoury]

@sean-mcmanus Most of the files are ASCII text, with CRLF line terminators and ANSI (Windows-1252) encoding on Windows.

[Colengms]

Hi @psclkhoury A bad_alloc exception would seem to suggest running out of memory. cpptools-srv.exe is currently a 32-bit process on Windows. Do you see it grow to ~4G as this occurs?