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gh-125221: Fix free-threading data race in `object.__reduce_ex__` (#125267)

This commit is contained in:
Sam Gross 2024-10-11 03:56:01 -04:00 committed by GitHub
parent c1913effee
commit b12e99261e
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GPG Key ID: B5690EEEBB952194
3 changed files with 15 additions and 15 deletions
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2
Misc/NEWS.d/next/Core_and_Builtins/2024-10-10-14-47-13.gh-issue-125221.nfSQzT.rst Normal file
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@ -0,0 +1,2 @@
Fix possible race condition when calling :meth:`~object.__reduce_ex__` for the
first time in the free threading build.

8
Objects/object.c
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@ -2372,6 +2372,14 @@ _PyTypes_InitTypes(PyInterpreterState *interp)
}
}
// Cache __reduce__ from PyBaseObject_Type object
PyObject *baseobj_dict = _PyType_GetDict(&PyBaseObject_Type);
PyObject *baseobj_reduce = PyDict_GetItemWithError(baseobj_dict, &_Py_ID(__reduce__));
if (baseobj_reduce == NULL && PyErr_Occurred()) {
return _PyStatus_ERR("Can't get __reduce__ from base object");
}
_Py_INTERP_CACHED_OBJECT(interp, objreduce) = baseobj_reduce;
// Must be after static types are initialized
if (_Py_initialize_generic(interp) < 0) {
return _PyStatus_ERR("Can't initialize generic types");

20
Objects/typeobject.c
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@ -7359,18 +7359,7 @@ static PyObject *
object___reduce_ex___impl(PyObject *self, int protocol)
/*[clinic end generated code: output=2e157766f6b50094 input=f326b43fb8a4c5ff]*/
{
#define objreduce \
(_Py_INTERP_CACHED_OBJECT(_PyInterpreterState_GET(), objreduce))
PyObject *reduce, *res;
if (objreduce == NULL) {
PyObject *dict = lookup_tp_dict(&PyBaseObject_Type);
objreduce = PyDict_GetItemWithError(dict, &_Py_ID(__reduce__));
if (objreduce == NULL && PyErr_Occurred()) {
return NULL;
}
}
PyObject *reduce;
if (PyObject_GetOptionalAttr(self, &_Py_ID(__reduce__), &reduce) < 0) {
return NULL;
}
@ -7384,10 +7373,12 @@ object___reduce_ex___impl(PyObject *self, int protocol)
Py_DECREF(reduce);
return NULL;
}
override = (clsreduce != objreduce);
PyInterpreterState *interp = _PyInterpreterState_GET();
override = (clsreduce != _Py_INTERP_CACHED_OBJECT(interp, objreduce));
Py_DECREF(clsreduce);
if (override) {
res = _PyObject_CallNoArgs(reduce);
PyObject *res = _PyObject_CallNoArgs(reduce);
Py_DECREF(reduce);
return res;
}
@ -7396,7 +7387,6 @@ object___reduce_ex___impl(PyObject *self, int protocol)
}
return _common_reduce(self, protocol);
#undef objreduce
}
static PyObject *