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gh-159739: Release replaced type alias values - #160167
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JelleZijlstra merged 1 commit intoOct 22, 2026
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A type alias can be evaluated again before an earlier evaluation finishes, either recursively or in another thread. The later completion overwrites the cached value without releasing it, permanently leaking that value; synchronize cache access and release the replaced value outside the lock. Backport to 3.15 and 3.14.
JelleZijlstra
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October 22, 2026 14:01
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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15. |
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GH-160242 is a backport of this pull request to the 3.15 branch. |
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GH-160243 is a backport of this pull request to the 3.14 branch. |
JelleZijlstra
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…0242) A type alias can be evaluated again before an earlier evaluation finishes, either recursively or in another thread. The later completion overwrites the cached value without releasing it, permanently leaking that value; synchronize cache access and release the replaced value outside the lock. Backport to 3.15 and 3.14. (cherry picked from commit d36a3f6) Co-authored-by: Jelle Zijlstra <jelle@openai.com>
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A type alias can be evaluated again before an earlier evaluation finishes, either recursively or in another thread. The later completion overwrites the cached value without releasing it, permanently leaking that value; synchronize cache access and release the replaced value outside the lock. Backport to 3.15 and 3.14.