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Sometimes seen on buildbots (e.g. http://www.python.org/dev/buildbot/all/builders/AMD64%20Ubuntu%20LTS%203.x/builds/309/steps/test/logs/stdio ). It seems it's always testRecvmsgEOF which fails.
$ ./python -m test -m RecvmsgSCTPStreamTest -unetwork -Fv test_socket
[...]
[ 36] test_socket
testRecvmsg (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgAfterClose (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgBadArgs (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgEOF (test.test_socket.RecvmsgSCTPStreamTest) ... ERROR
testRecvmsgExplicitDefaults (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgFromSendmsg (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgLongAncillaryBuf (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgOverflow (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgPeek (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgShortAncillaryBuf (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgShorter (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgTimeout (test.test_socket.RecvmsgSCTPStreamTest) ... ok
testRecvmsgTrunc (test.test_socket.RecvmsgSCTPStreamTest) ... ok
======================================================================
ERROR: testRecvmsgEOF (test.test_socket.RecvmsgSCTPStreamTest)
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Traceback (most recent call last):
 File "/home/antoine/cpython/default/Lib/test/test_socket.py", line 2192, in testRecvmsgEOF
 msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock, 1024)
 File "/home/antoine/cpython/default/Lib/test/test_socket.py", line 1683, in doRecvmsg
 result = sock.recvmsg(bufsize, *args)
OSError: [Errno 107] Transport endpoint is not connected
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