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Segfault under free-threaded build #8454
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It's strange that our Ubuntu GitHub Actions free-threaded job doesn't detect this error, isn't it? The error report is on macOS, maybe the error only occurs on that platform.
Edit: Oh, I see, you need to install pytest-freethreaded. Phase 2 of the README (
--threads 1 --iterations 1) passes on Ubuntu, but Phase 3 (--require-gil-disabled) does not.Reacted by Lysandros Nikolaou
See tonybaloney/pytest-freethreaded#9 where this was discovered and for steps to reproduce.
Ultimately this comes down to the thread safety warnings in the freetype docs for
FT_Face: https://freetype.org/freetype2/docs/reference/ft2-face_creation.html#ft_face. Somehow anFT_Faceis being shared across threads in the test scenario linked above.Ping @lysnikolaou