Issue #24097: Fixed crash in object.__reduce__() if slot name is freed inside

__getattr__.  Original patch by Antoine Pitrou.

1 files changed, 17 insertions, 0 deletions

diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index d096390..f5e4b02 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -5092,6 +5092,23 @@ class PicklingTests(unittest.TestCase):
                     objcopy2 = deepcopy(objcopy)
                     self._assert_is_copy(obj, objcopy2)
 
+    def test_issue24097(self):
+        # Slot name is freed inside __getattr__ and is later used.
+        class S(str):  # Not interned
+            pass
+        class A:
+            __slotnames__ = [S('spam')]
+            def __getattr__(self, attr):
+                if attr == 'spam':
+                    A.__slotnames__[:] = [S('spam')]
+                    return 42
+                else:
+                    raise AttributeError
+
+        import copyreg
+        expected = (copyreg.__newobj__, (A,), (None, {'spam': 42}), None, None)
+        self.assertEqual(A().__reduce__(2), expected)  # Shouldn't crash
+
 
 class SharedKeyTests(unittest.TestCase):