gh-109793: Allow Switching Interpreters During Finalization (gh-109794)

Essentially, we should check the thread ID rather than the thread state pointer.

1 files changed, 21 insertions, 0 deletions

diff --git a/Lib/test/test_interpreters.py b/Lib/test/test_interpreters.py
index 90932c0..9c0dac7 100644
--- a/Lib/test/test_interpreters.py
+++ b/Lib/test/test_interpreters.py
@@ -1,5 +1,6 @@
 import contextlib
 import os
+import sys
 import threading
 from textwrap import dedent
 import unittest
@@ -487,6 +488,26 @@ class StressTests(TestBase):
             pass
 
 
+class FinalizationTests(TestBase):
+
+    def test_gh_109793(self):
+        import subprocess
+        argv = [sys.executable, '-c', '''if True:
+            import _xxsubinterpreters as _interpreters
+            interpid = _interpreters.create()
+            raise Exception
+            ''']
+        proc = subprocess.run(argv, capture_output=True, text=True)
+        self.assertIn('Traceback', proc.stderr)
+        if proc.returncode == 0 and support.verbose:
+            print()
+            print("--- cmd unexpected succeeded ---")
+            print(f"stdout:\n{proc.stdout}")
+            print(f"stderr:\n{proc.stderr}")
+            print("------")
+        self.assertEqual(proc.returncode, 1)
+
+
 class TestIsShareable(TestBase):
 
     def test_default_shareables(self):