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gh-117657: Fix data races in the method cache in free-threaded builds #117954

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merged 1 commit into from
Apr 17, 2024
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gh-117657: Fix data races in the method cache in free-threaded builds #117954

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8 changes: 5 additions & 3 deletions Objects/typeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4974,13 +4974,15 @@ is_dunder_name(PyObject *name)
static void
update_cache(struct type_cache_entry *entry, PyObject *name, unsigned int version_tag, PyObject *value)
{
entry->version = version_tag;
entry->value = value; /* borrowed */
_Py_atomic_store_uint32_relaxed(&entry->version, version_tag);
_Py_atomic_store_ptr_relaxed(&entry->value, value); /* borrowed */
assert(_PyASCIIObject_CAST(name)->hash != -1);
OBJECT_STAT_INC_COND(type_cache_collisions, entry->name != Py_None && entry->name != name);
// We're releasing this under the lock for simplicity sake because it's always a
// exact unicode object or Py_None so it's safe to do so.
Py_SETREF(entry->name, Py_NewRef(name));
PyObject *old_name = entry->name;
_Py_atomic_store_ptr_relaxed(&entry->name, Py_NewRef(name));
Py_DECREF(old_name);
}

#if Py_GIL_DISABLED
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1 change: 0 additions & 1 deletion Tools/tsan/suppressions_free_threading.txt
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Expand Up @@ -47,5 +47,4 @@ race:set_inheritable
race:start_the_world
race:tstate_set_detached
race:unicode_hash
race:update_cache
race:update_cache_gil_disabled
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