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Title: gh-132917: Fix data race detected by tsan by Yhg1s · Pull Request #133508 · python/cpython · GitHub

Open Graph Title: gh-132917: Fix data race detected by tsan by Yhg1s · Pull Request #133508 · python/cpython

X Title: gh-132917: Fix data race detected by tsan by Yhg1s · Pull Request #133508 · python/cpython

Description: Fix data race detected by tsan (https://github.com/python/cpython/actions/runs/14857021107/job/41712717208?pr=133502): young.count can be modified by other threads even while the gcstate is locked. This is the simplest fix to (potentially) unblock beta 1, although this particular code path seems like it could just be an atomic swap followed by an atomic add, without having the lock at all. Issue: gh-132917

Open Graph Description: Fix data race detected by tsan (https://github.com/python/cpython/actions/runs/14857021107/job/41712717208?pr=133502): young.count can be modified by other threads even while the gcstate is locked....

X Description: Fix data race detected by tsan (https://github.com/python/cpython/actions/runs/14857021107/job/41712717208?pr=133502): young.count can be modified by other threads even while the gcstate is locked....

Opengraph URL: https://github.com/python/cpython/pull/133508

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