diff -r 4d3557500019 Lib/test/test_descr.py
--- a/Lib/test/test_descr.py	Sat Jul 18 23:37:31 2015 +0300
+++ b/Lib/test/test_descr.py	Mon Jul 20 00:11:59 2015 +0300
@@ -5028,6 +5028,19 @@ class PicklingTests(unittest.TestCase):
                     objcopy2 = deepcopy(objcopy)
                     self._assert_is_copy(obj, objcopy2)
 
+    def test_issue24097(self):
+        class S(str):
+            pass
+        class A:
+            __slotnames__ = [S('spam')]
+            def __getattr__(self, attr):
+                if attr == 'spam':
+                    A.__slotnames__[:] = [S('spam')]
+                    return 42
+                else:
+                    raise AttributeError
+
+        A().__reduce__(2)
 
 class SharedKeyTests(unittest.TestCase):