Windows crash: [mutex.cc : 2600] RAW: Check waitp->thread->waitp == nullptr failed: waiting when shouldn't be

[Jeroen Ooms]

I maintain bindings for V8 for the R programming language. We run into a difficult problem: applications that run WASM seem to be random crashing on Windows 2025 with the following error:

   [mutex.cc : 2600] RAW: Check waitp->thread->waitp == nullptr failed: waiting when shouldn't be

This error originates in abseil. I tested this both with V8 14.0.365.4 and 14.1.146.11. Strangely it never happens on Windows 2022; but we found in other instances as well that Windows 2025 has become more strict/sensitive about memory and threading bugs.

Besides being non deterministic, what makes this difficult to reproduce is that we have to compile with gcc from mingw-w64 (we use mingw-w64-v8 on msys2).

Any hint to which component of v8 could be related to this?