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gh-133467: fix data race in type_set_name #137302

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Merged
kumaraditya303 merged 4 commits into from
Aug 1, 2025
Merged

gh-133467: fix data race in type_set_name #137302

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a2776fb
fix some races
kumaraditya303 Aug 1, 2025
b124620
remove suppressions
kumaraditya303 Aug 1, 2025
dfcd1bf
decref after starting world
kumaraditya303 Aug 1, 2025
632f771
fix test
kumaraditya303 Aug 1, 2025
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fix some races
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@kumaraditya303
kumaraditya303 committed Aug 1, 2025
commit a2776fb21953aa3436959784262a04f022bf194e
14 changes: 14 additions & 0 deletions Lib/test/test_free_threading/test_type.py
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Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,20 @@ class ClassB(Base):
obj.__class__ = ClassB


def test_name_change(self):
class Foo:
pass

def writer():
for _ in range(1000):
Foo.__name__ = 'Bar'

def reader():
for _ in range(1000):
self.assertEqual(Foo.__name__, 'Bar')

self.run_one(writer, reader)

def run_one(self, writer_func, reader_func):
barrier = threading.Barrier(NTHREADS)

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6 changes: 5 additions & 1 deletion Objects/typeobject.c
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Expand Up @@ -1535,9 +1535,11 @@ type_set_name(PyObject *tp, PyObject *value, void *Py_UNUSED(closure))
return -1;
}

PyInterpreterState *interp = _PyInterpreterState_GET();
_PyEval_StopTheWorld(interp);
type->tp_name = tp_name;
Py_SETREF(((PyHeapTypeObject*)type)->ht_name, Py_NewRef(value));

_PyEval_StartTheWorld(interp);
return 0;
}

Expand Down Expand Up @@ -10706,9 +10708,11 @@ slot_tp_descr_get(PyObject *self, PyObject *obj, PyObject *type)

get = _PyType_LookupRef(tp, &_Py_ID(__get__));
if (get == NULL) {
#ifndef Py_GIL_DISABLED
/* Avoid further slowdowns */
if (tp->tp_descr_get == slot_tp_descr_get)
tp->tp_descr_get = NULL;
#endif
return Py_NewRef(self);
}
if (obj == NULL)
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