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Title: gh-149816: Fix a race condition in `_PyBytes_FromList` with free-threading by sobolevn · Pull Request #149909 · python/cpython · GitHub

Open Graph Title: gh-149816: Fix a race condition in `_PyBytes_FromList` with free-threading by sobolevn · Pull Request #149909 · python/cpython

X Title: gh-149816: Fix a race condition in `_PyBytes_FromList` with free-threading by sobolevn · Pull Request #149909 · python/cpython

Description: _PyBytes_FromList is called from PyBytes_FromObject which does not own the passed object, so it is a borrowed reference. Using _PyList_GetItemRef seems like the correct solution here. However, I was not successful in actually triggering the failure without C-API direct usage. Issue: gh-149816

Open Graph Description: _PyBytes_FromList is called from PyBytes_FromObject which does not own the passed object, so it is a borrowed reference. Using _PyList_GetItemRef seems like the correct solution here. However, I wa...

X Description: _PyBytes_FromList is called from PyBytes_FromObject which does not own the passed object, so it is a borrowed reference. Using _PyList_GetItemRef seems like the correct solution here. However, I wa...

Opengraph URL: https://github.com/python/cpython/pull/149909

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b2b19e2 gh-149816: Fix a race condition in `_PyBytes_FromList` with free-thre… sobolevn May 16, 2026 https://github.com/python/cpython/pull/149909/commits/b2b19e2d1f465168c86b201ed7f867a0cb686125
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