https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99529
--- Comment #6 from Tobias Burnus <burnus at gcc dot gnu.org> --- Patch: https://gcc.gnu.org/pipermail/gcc-patches/2021-March/566596.html @Martin: Besides helgrind, you could also try building your program with -fsanitize=thread - this might also help finding some issues (for environment flags, see https://github.com/google/sanitizers/wiki/ThreadSanitizerFlags )
