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Title: gh-77377: Ensure multiprocessing SemLock is valid for spawn-based Process before serializing it by albanD · Pull Request #107275 · python/cpython · GitHub

Open Graph Title: gh-77377: Ensure multiprocessing SemLock is valid for spawn-based Process before serializing it by albanD · Pull Request #107275 · python/cpython

X Title: gh-77377: Ensure multiprocessing SemLock is valid for spawn-based Process before serializing it by albanD · Pull Request #107275 · python/cpython

Description: This fixes both the example in the initial report #77377 and other reports on the PyTorch repo. Note that as far as I can tell, all objects that lead to segfault with mixed context are all caused by SemLock created with fork sent over a Spawn process. That's why it is the only object updated here and the only pair of ctx covered. Let me know if I'm mistaken and I can find a way to update other objects as well. Also windows behavior is not changed here (and thus not tested). Please let me know if the error message and/or the test are not appropriate and I can work on improving them. Issue: gh-77377

Open Graph Description: This fixes both the example in the initial report #77377 and other reports on the PyTorch repo. Note that as far as I can tell, all objects that lead to segfault with mixed context are all caused b...

X Description: This fixes both the example in the initial report #77377 and other reports on the PyTorch repo. Note that as far as I can tell, all objects that lead to segfault with mixed context are all caused b...

Opengraph URL: https://github.com/python/cpython/pull/107275

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