@@ -1512,6 +1512,21 @@ def test_asyncgen_hooks(self):
         self.assertIsNone(cur.firstiter)
         self.assertIsNone(cur.finalizer)
 
+    def test_changing_sys_stderr_and_removing_reference(self):
+        # If the default displayhook doesn't take a strong reference
+        # to sys.stderr the following code can crash. See bpo-43660
+        # for more details.
+        code = textwrap.dedent('''
+            import sys
+            class MyStderr:
+                def write(self, s):
+                    sys.stderr = None
+            sys.stderr = MyStderr()
+            1/0
+        ''')
+        rc, out, err = assert_python_failure('-c', code)
+        self.assertEqual(out, b"")
+        self.assertEqual(err, b"")
 
 if __name__ == "__main__":
     unittest.main()
@@ -0,0 +1,3 @@
+Fix crash that happens when replacing ``sys.stderr`` with a callable that
+can remove the object while an exception is being printed. Patch by Pablo
+Galindo.
@@ -1082,8 +1082,9 @@ PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)
     if (file == Py_None) {
         return;
     }
-
+    Py_INCREF(file);
     _PyErr_Display(file, exception, value, tb);
+    Py_DECREF(file);
 }
 
 PyObject *
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	+Fix crash that happens when replacing ``sys.stderr`` with a callable that
	`2`	`+can remove the object while an exception is being printed. Patch by Pablo`
	`3`	`+Galindo.`
Original file line number	Diff line number	Diff line change
`@@ -1082,8 +1082,9 @@ PyErr_Display(PyObject exception, PyObject value, PyObject *tb)`
`1082`	`1082`	`if (file == Py_None) {`
`1083`	`1083`	`return;`
`1084`	`1084`	`}`
`1085`		`-`
	`1085`	`+ Py_INCREF(file);`
`1086`	`1086`	`_PyErr_Display(file, exception, value, tb);`
	`1087`	`+ Py_DECREF(file);`
`1087`	`1088`	`}`
`1088`	`1089`
`1089`	`1090`	`PyObject *`