This is very similar in root cause to issue #483 - SSL handshakes that have been initiated but not completed. This code in sslproto.py:

if compat.PY34:
 def __del__(self):
 if not self._closed:
 warnings.warn("unclosed transport %r" % self, ResourceWarning)
 self.close()

leads to annoying log spew that is out of the control of the server developer. The cause is wrapped SSL sockets that have not completed their handshake and that therefore the transport has not been provided to the protocol's connection_made() callback. As server developer I therefore have no way to cleanly close down these transports. So when the server admin shuts down the server, which does cleanly close all the transports it is aware of then does a loop.close() and exits, he is left with many messages like this sent to the logs. This is unsightly and frustrating as I am unable to prevent it.

Perhaps the above code in __del__() should not be executed if the loop has been closed?

017-01-20 19:32:16.331209500 Exception ignored in: <bound method _SSLProtocolTransport.del of <asyncio.sslproto._SSLProtocolTransport object at 0x80a8e5e10>>
2017年01月20日 19:32:16.331215500 Traceback (most recent call last):
2017年01月20日 19:32:16.331218500 File "/usr/local/lib/python3.5/asyncio/sslproto.py", line 328, in del
2017年01月20日 19:32:16.331220500 self.close()
2017年01月20日 19:32:16.331222500 File "/usr/local/lib/python3.5/asyncio/sslproto.py", line 319, in close
2017年01月20日 19:32:16.331224500 self._ssl_protocol._start_shutdown()
2017年01月20日 19:32:16.331340500 File "/usr/local/lib/python3.5/asyncio/sslproto.py", line 542, in _start_shutdown
2017年01月20日 19:32:16.331343500 self._write_appdata(b'')
2017年01月20日 19:32:16.331345500 File "/usr/local/lib/python3.5/asyncio/sslproto.py", line 547, in _write_appdata
2017年01月20日 19:32:16.331347500 self._process_write_backlog()
2017年01月20日 19:32:16.331349500 File "/usr/local/lib/python3.5/asyncio/sslproto.py", line 649, in _process_write_backlog
2017年01月20日 19:32:16.331359500 self._on_handshake_complete(exc)
2017年01月20日 19:32:16.331361500 File "/usr/local/lib/python3.5/asyncio/sslproto.py", line 587, in _on_handshake_complete
2017年01月20日 19:32:16.331364500 self._wakeup_waiter(exc)
2017年01月20日 19:32:16.331366500 File "/usr/local/lib/python3.5/asyncio/sslproto.py", line 445, in _wakeup_waiter
2017年01月20日 19:32:16.331368500 self._waiter.set_exception(exc)
2017年01月20日 19:32:16.331378500 File "/usr/local/lib/python3.5/asyncio/futures.py", line 349, in set_exception
2017年01月20日 19:32:16.331393500 self._schedule_callbacks()
2017年01月20日 19:32:16.331395500 File "/usr/local/lib/python3.5/asyncio/futures.py", line 242, in _schedule_callbacks
2017年01月20日 19:32:16.331398500 self._loop.call_soon(callback, self)
2017年01月20日 19:32:16.331400500 File "/usr/local/lib/python3.5/asyncio/base_events.py", line 497, in call_soon
2017年01月20日 19:32:16.331403500 handle = self._call_soon(callback, args)
2017年01月20日 19:32:16.331412500 File "/usr/local/lib/python3.5/asyncio/base_events.py", line 506, in _call_soon
2017年01月20日 19:32:16.331414500 self._check_closed()
2017年01月20日 19:32:16.331416500 File "/usr/local/lib/python3.5/asyncio/base_events.py", line 334, in _check_closed
2017年01月20日 19:32:16.331419500 raise RuntimeError('Event loop is closed')
2017年01月20日 19:32:16.331421500 RuntimeError: Event loop is closed
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