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[3.13] gh-143880: Fix data race in functools.partial in free threading build (GH-143882) (#145435)

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Co-authored-by: Sam Gross <colesbury@gmail.com>
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Miss Islington (bot) 2026-03-02 22:31:46 +01:00 • committed by GitHub
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1
Misc/NEWS.d/next/Library/2026-01-15-13-03-22.gh-issue-143880.sWoLsf.rst Normal file
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@ -0,0 +1 @@
Fix data race in :func:`functools.partial` in the :term:`free threading` build.

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Modules/_functoolsmodule.c
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@ -220,7 +220,9 @@ partial_vectorcall_fallback(PyThreadState *tstate, partialobject *pto,
PyObject *const *args, size_t nargsf,
PyObject *kwnames)
{
#ifndef Py_GIL_DISABLED
pto->vectorcall = NULL;
#endif
Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
return _PyObject_MakeTpCall(tstate, (PyObject *)pto,
args, nargs, kwnames);