[3.10] gh-94510: Raise on re-entrant calls to sys.setprofile and syssettrace (GH-94511) (#94579)

Co-authored-by: Łukasz Langa <lukasz@langa.pl>.
Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/Lib/test/test_sys_setprofile.py b/Lib/test/test_sys_setprofile.py
index 21a09b5192..4c3053a1e3 100644
--- a/Lib/test/test_sys_setprofile.py
+++ b/Lib/test/test_sys_setprofile.py
@@ -2,6 +2,7 @@ import gc
 import pprint
 import sys
 import unittest
+from test import support
 
 
 class TestGetProfile(unittest.TestCase):
@@ -415,5 +416,43 @@ def show_events(callable):
     pprint.pprint(capture_events(callable))
 
 
+class TestEdgeCases(unittest.TestCase):
+
+    def setUp(self):
+        self.addCleanup(sys.setprofile, sys.getprofile())
+        sys.setprofile(None)
+
+    def test_reentrancy(self):
+        def foo(*args):
+            ...
+
+        def bar(*args):
+            ...
+
+        class A:
+            def __call__(self, *args):
+                pass
+
+            def __del__(self):
+                sys.setprofile(bar)
+
+        sys.setprofile(A())
+        with support.catch_unraisable_exception() as cm:
+            sys.setprofile(foo)
+            self.assertEqual(cm.unraisable.object, A.__del__)
+            self.assertIsInstance(cm.unraisable.exc_value, RuntimeError)
+
+        self.assertEqual(sys.getprofile(), foo)
+
+
+    def test_same_object(self):
+        def foo(*args):
+            ...
+
+        sys.setprofile(foo)
+        del foo
+        sys.setprofile(sys.getprofile())
+
+
 if __name__ == "__main__":
     unittest.main()