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gh-132070: Fix PyObject_Realloc thread-safety in free threaded Python #143441

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Merged
colesbury merged 3 commits into from
Jan 6, 2026
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gh-132070: Fix PyObject_Realloc thread-safety in free threaded Python #143441

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a4c76a6
gh-132070: Fix PyObject_Realloc thread-safety in free threaded Python
colesbury Jan 2, 2026
da8b157
Update Objects/obmalloc.c
colesbury Jan 5, 2026
3387cd2
Add comment about memcpy
colesbury Jan 6, 2026
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Update Objects/obmalloc.c 
Co-authored-by: T. Wouters <thomas@python.org>
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@colesbury @Yhg1s
colesbury and Yhg1s authored Jan 5, 2026
commit da8b157fc9e05f2a79302ca8b449306d22085417
2 changes: 1 addition & 1 deletion Objects/obmalloc.c
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Expand Up @@ -320,7 +320,7 @@ _PyObject_MiRealloc(void *ctx, void *ptr, size_t nbytes)
return NULL;
}

// Free threaded Python allows safe access to the PyObject reference count
// Free threaded Python allows access from other threads to the PyObject reference count
// fields for a period of time after the object is freed (see InternalDocs/qsbr.md).
// These fields are typically initialized by PyObject_Init() using relaxed
// atomic stores. We need to copy these fields in a thread-safe way here.
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