diff --git a/Python/_warnings.c b/Python/_warnings.c
index 66a460e2a2c509..c16bc5362d4502 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -398,9 +398,9 @@ already_warned(PyInterpreterState *interp, PyObject *registry, PyObject *key,
return -1;
WarningsState *st = warnings_get_state(interp);
- if (st == NULL) {
- return -1;
- }
+ assert(st != NULL);
+ _Py_CRITICAL_SECTION_ASSERT_MUTEX_LOCKED(&st->mutex);
+
PyObject *version_obj;
if (PyDict_GetItemRef(registry, &_Py_ID(version), &version_obj) < 0) {
return -1;
@@ -1173,11 +1173,14 @@ warnings_filters_mutated_impl(PyObject *module)
if (interp == NULL) {
return NULL;
}
+
WarningsState *st = warnings_get_state(interp);
- if (st == NULL) {
- return NULL;
- }
+ assert(st != NULL);
+
+ Py_BEGIN_CRITICAL_SECTION_MUT(&st->mutex);
st->filters_version++;
+ Py_END_CRITICAL_SECTION();
+
Py_RETURN_NONE;
}
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