PR authors and core devs have been seeing CIFuzz failures on PRs not related to their changes of late. These are non-blocking, but confusing.

The CIFuzz build step is failing, it seems that _freeze_module crashes:

./Programs/_freeze_module importlib._bootstrap_external ./Lib/importlib/_bootstrap_external.py Python/frozen_modules/importlib._bootstrap_external.h
Segmentation fault (core dumped)

I believe _freeze_module got compiled with memory-sanitizer but no useful MSAN report seems to be generated by that crash.

Unclear where the problem lies, maybe this could be CIFuzz container or clang related?

CIFuzz background: read PR #107653 (discussion and links) and Issue #107652 (the pitch).

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-116886: Temporarily disable CIfuzz (memory) #117018
• Revert "gh-116886: Temporarily disable CIfuzz (memory) (#117018)" #117289