2 files changed, 78 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()
diff --git a/Lib/test/test_sys_settrace.py b/Lib/test/test_sys_settrace.py
index 4b3d096f16..1f509eee55 100644
--- a/Lib/test/test_sys_settrace.py
+++ b/Lib/test/test_sys_settrace.py
@@ -2,6 +2,7 @@
 
 from test import support
 import unittest
+from unittest.mock import MagicMock
 import sys
 import difflib
 import gc
@@ -2196,5 +2197,43 @@ output.append(4)
         output.append(8)
 
 
+class TestEdgeCases(unittest.TestCase):
+
+    def setUp(self):
+        self.addCleanup(sys.settrace, sys.gettrace())
+        sys.settrace(None)
+
+    def test_reentrancy(self):
+        def foo(*args):
+            ...
+
+        def bar(*args):
+            ...
+
+        class A:
+            def __call__(self, *args):
+                pass
+
+            def __del__(self):
+                sys.settrace(bar)
+
+        sys.settrace(A())
+        with support.catch_unraisable_exception() as cm:
+            sys.settrace(foo)
+            self.assertEqual(cm.unraisable.object, A.__del__)
+            self.assertIsInstance(cm.unraisable.exc_value, RuntimeError)
+
+        self.assertEqual(sys.gettrace(), foo)
+
+
+    def test_same_object(self):
+        def foo(*args):
+            ...
+
+        sys.settrace(foo)
+        del foo
+        sys.settrace(sys.gettrace())
+
+
 if __name__ == "__main__":
     unittest.main()