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[3.13] gh-129643: Fix PyList_Insert in free-threading builds (GH-129680) (#129725)

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(cherry picked from commit 63f0406d5a)
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sobolevn 2025-02-06 16:22:41 +03:00 • committed by GitHub
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Misc/NEWS.d/next/Core and Builtins/2025-02-05-11-29-52.gh-issue-129643.4mGzvg.rst Normal file
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@ -0,0 +1 @@
Fix thread safety of :c:func:`PyList_Insert` in free-threading builds.

4
Objects/listobject.c
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@ -498,8 +498,8 @@ ins1(PyListObject *self, Py_ssize_t where, PyObject *v)
where = n;
items = self->ob_item;
for (i = n; --i >= where; )
items[i+1] = items[i];
items[where] = Py_NewRef(v);
FT_ATOMIC_STORE_PTR_RELAXED(items[i+1], items[i]);
FT_ATOMIC_STORE_PTR_RELEASE(items[where], Py_NewRef(v));
return 0;
}