vm: skip LOAD_ATTR_GETATTRIBUTE_OVERRIDDEN when __getattr__ is also defined

youknowone · youknowone · commit 2b87143925d5 · 2026-03-06T06:13:57.000+09:00
Calling __getattribute__ directly bypasses the __getattr__ fallback
that slot_tp_getattr_hook normally provides. Guard against this by
refusing to specialize when the class also defines __getattr__.
diff --git a/crates/vm/src/frame.rs b/crates/vm/src/frame.rs
@@ -6972,6 +6972,7 @@ impl ExecutingFrame<'_> {
             if type_version != 0
                 && !oparg.is_method()
                 && !self.specialization_eval_frame_active(_vm)
+                && cls.get_attr(identifier!(_vm, __getattr__)).is_none()
                 && let Some(getattribute) = cls.get_attr(identifier!(_vm, __getattribute__))
                 && let Some(func) = getattribute.downcast_ref_if_exact::<PyFunction>(_vm)
                 && func.can_specialize_call(2)
