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[3.6] bpo-31323: Fix reference leak in test_ssl (GH-3263) (#3538)

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Store exceptions as string rather than object to prevent reference
cycles which cause leaking dangling threads.
(cherry picked from commit 8687101589)
This commit is contained in:
Miss Islington (bot) 2017-09-13 03:27:34 -07:00 • committed by Victor Stinner
parent 547f2a97ea
commit 1b00bddd5c
1 changed files with 6 additions and 2 deletions
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8
Lib/test/test_ssl.py
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@ -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):
"""