pythongh-116397: Clear freelists during stop-the-world

colesbury · colesbury · commit 2fb90fb271a4 · 2024-03-06T01:05:45.000Z
diff --git a/Python/gc_free_threading.c b/Python/gc_free_threading.c
@@ -1058,6 +1058,8 @@ gc_collect_internal(PyInterpreterState *interp, struct collection_state *state)
     // Handle any objects that may have resurrected after the finalization.
     _PyEval_StopTheWorld(interp);
     err = handle_resurrected_objects(state);
+    // Clear free lists in all threads
+    _PyGC_ClearAllFreeLists(interp);
     _PyEval_StartTheWorld(interp);
 
     if (err < 0) {
@@ -1160,9 +1162,6 @@ gc_collect_main(PyThreadState *tstate, int generation, _PyGC_Reason reason)
             n+m, n, d);
     }
 
-    // Clear free lists in all threads
-    _PyGC_ClearAllFreeLists(interp);
-
     if (_PyErr_Occurred(tstate)) {
         if (reason == _Py_GC_REASON_SHUTDOWN) {
             _PyErr_Clear(tstate);
