From 1b00bddd5c4a5728b15eee5a27ed3f78a173ef64 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Wed, 13 Sep 2017 03:27:34 -0700
Subject: [PATCH] [3.6] bpo-31323: Fix reference leak in test_ssl (GH-3263)
 (#3538)

Store exceptions as string rather than object to prevent reference
cycles which cause leaking dangling threads.
(cherry picked from commit 868710158910fa38e285ce0e6d50026e1d0b2a8c)
---
 Lib/test/test_ssl.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index e001badad1..54644e1596 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -1867,7 +1867,11 @@ if _have_threads:
                     # XXX Various errors can have happened here, for example
                     # a mismatching protocol version, an invalid certificate,
                     # or a low-level bug. This should be made more discriminating.
-                    self.server.conn_errors.append(e)
+                    #
+                    # bpo-31323: Store the exception as string to prevent
+                    # a reference leak: server -> conn_errors -> exception
+                    # -> traceback -> self (ConnectionHandler) -> server
+                    self.server.conn_errors.append(str(e))
                     if self.server.chatty:
                         handle_error("\n server:  bad connection attempt from " + repr(self.addr) + ":\n")
                     self.running = False
@@ -3081,7 +3085,7 @@ if _have_threads:
                 with context.wrap_socket(socket.socket()) as s:
                     with self.assertRaises(OSError):
                         s.connect((HOST, server.port))
-            self.assertIn("no shared cipher", str(server.conn_errors[0]))
+            self.assertIn("no shared cipher", server.conn_errors[0])
 
         def test_version_basic(self):
             """
-- 
2.50.1