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We found a related issue with Tornado: https://github.com/facebook/tornado/pull/750
We call wrap_socket with do_handshake_on_connect=False and then call do_handshake when the socket is ready. If the getpeername call in wrap_socket fails with ENOTCONN because the connection was reset immediately after it was opened, then do_handshake will fail with an AttributeError (because self._sslobj is None). do_handshake should fail with a clearer error (perhaps socket.error with ENOTCONN or ECONNABORTED?) if self._sslobj is None.
Also, Mac OS X appears to return EINVAL from getpeername in this case, instead of ENOTCONN. wrap_socket should probably treat ENOTCONN and EINVAL from getpeername as equivalent.