gh-117657: Fix data race in _Py_IsImmortal
#118261
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The load of `ob_ref_local`: https://github.com/python/cpython/blob/4b10e209c76f9f36f8ae2e4d713b3a01591c1856/Include/object.h#L352 races with ([example](https://gist.github.com/mpage/7e2028b3ca811deb350f705bc3c737ca)) stores: https://github.com/python/cpython/blob/4b10e209c76f9f36f8ae2e4d713b3a01591c1856/Include/object.h#L883 Using a relaxed load is sufficient; stores to the field are relaxed.
colesbury
approved these changes
Apr 25, 2024
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The load of
ob_ref_local:cpython/Include/object.h
Line 352 in 4b10e20
races with stores (example):
cpython/Include/object.h
Line 883 in 4b10e20
Using a relaxed load is sufficient; stores to the field are relaxed.