Tolerate a changed-size RuntimeError in the set repr stress test

youknowone · youknowone · commit ace799ab4b0f · 2026-08-13T22:46:24.000+09:00
The mutator and reader threads race on purpose; a "changed size during
iteration" RuntimeError is a valid outcome of that race and should not fail
the test. The panic it guards against is not.

Assisted-by: Claude
diff --git a/extra_tests/snippets/crash_regressions.py b/extra_tests/snippets/crash_regressions.py
@@ -371,13 +371,19 @@ def build():
 
 def mutate_set():
     while not stop:
-        shared_set.clear()
-        shared_set.update({1, 2, 3})
+        try:
+            shared_set.clear()
+            shared_set.update({1, 2, 3})
+        except RuntimeError:  # changed size during iteration
+            pass
 
 
 def read_set():
     for _ in range(20000):
-        repr(shared_set)
+        try:
+            repr(shared_set)
+        except RuntimeError:  # changed size during iteration
+            pass
 
 
 threads = [threading.Thread(target=mutate_set) for _ in range(2)]
