[Bug 50963] New: CreateProcess occasionally fails with access violation

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50963

Bug ID: 50963
           Summary: CreateProcess occasionally fails with access violation
           Product: Wine
           Version: 6.6
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 69794
  --> https://bugs.winehq.org/attachment.cgi?id=69794
Trace log

A relatively complex CI with windows version of cmake/ninja/llvm after series
of regressions since Wine 6.0 almost works again in the version 6.6. But
occasionally it fails on CreateProcess with EXCEPTION_ACCESS_VIOLATION. I think
it is a wine bug as I also encountered such a strange behavior in another
context with Wine. I have a feeling that it is related to recent ntdll changes.

It appears quickly if CPU is under stress, parallel build is enabled and empty
WINEDEBUG. However I managed to trigger the bug also with parallel build
disabled and WINEDEBUG set to +process,+relay,+seh,err+all. Maybe some
unininitalized variable or race condition?

I'll wait for next version of Wine to test again.