Looking at the buildbot failures, there is a race condition in a test_socket test:

    def _testWithTimeoutTriggeredSend(self):
        address = self.serv.getsockname()
        with open(support.TESTFN, 'rb') as file:
            with socket.create_connection(address, timeout=0.01) as sock:
                meth = self.meth_from_sock(sock)
                self.assertRaises(socket.timeout, meth, file)

    def testWithTimeoutTriggeredSend(self):
        conn = self.accept_conn()
        conn.recv(88192)

on slow buildbot, create_connection() fails with a timeout exception sometimes because the server fails to start listing in less than 10 ms. 

https://buildbot.python.org/all/#/builders/167/builds/597

======================================================================
ERROR: testWithTimeoutTriggeredSend (test.test_socket.SendfileUsingSendTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/test/test_socket.py",
line 5796, in testWithTimeoutTriggeredSend
    conn = self.accept_conn()
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/test/test_socket.py",
line 5607, in accept_conn
    conn, addr = self.serv.accept()
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/socket.py",
line 212, in accept
    fd, addr = self._accept()
socket.timeout: timed out

======================================================================
ERROR: testWithTimeoutTriggeredSend (test.test_socket.SendfileUsingSendTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/test/test_socket.py",
line 335, in _tearDown
    raise exc
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/test/test_socket.py",
line 353, in clientRun
    test_func()
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/test/test_socket.py",
line 5791, in _testWithTimeoutTriggeredSend
    with socket.create_connection(address, timeout=0.01) as sock:
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/socket.py",
line 727, in create_connection
    raise err
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/socket.py",
line 716, in create_connection
    sock.connect(sa)
socket.timeout: timed out

Note: Reported my Victor. I created the bug to track.