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Title: [3.13] gh-143650: Fix importlib race condition on import failure (GH-143651) by gpshead · Pull Request #144697 · python/cpython · GitHub

Open Graph Title: [3.13] gh-143650: Fix importlib race condition on import failure (GH-143651) by gpshead · Pull Request #144697 · python/cpython

X Title: [3.13] gh-143650: Fix importlib race condition on import failure (GH-143651) by gpshead · Pull Request #144697 · python/cpython

Description: The Python programming language. Contribute to python/cpython development by creating an account on GitHub.

Open Graph Description: Fix a race condition where a thread could receive a partially-initialized module when another thread's import fails. The race occurs when: Thread 1 starts importing, adds module to sys.modules...

X Description: Fix a race condition where a thread could receive a partially-initialized module when another thread's import fails. The race occurs when: Thread 1 starts importing, adds module to sys.mod...

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Feb 11, 2026https://github.com/python/cpython/pull/144697#issue-3924916217
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importlib race condition allows stale module ref to escape on failure #143650https://github.com/python/cpython/issues/143650
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