AMD64 Ubuntu Shared 3.x:
https://buildbot.python.org/all/#/builders/101/builds/809

======================================================================
ERROR: test_shutdown_no_wait (test.test_concurrent_futures.ProcessPoolForkserverProcessPoolShutdownTest)
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Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_concurrent_futures.py", line 542, in test_shutdown_no_wait
    executor.shutdown(wait=False)
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/concurrent/futures/process.py", line 724, in shutdown
    self._executor_manager_thread_wakeup.wakeup()
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/concurrent/futures/process.py", line 80, in wakeup
    self._writer.send_bytes(b"")
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/multiprocessing/connection.py", line 188, in send_bytes
    self._check_closed()
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/multiprocessing/connection.py", line 141, in _check_closed
    raise OSError("handle is closed")
OSError: handle is closed

(...)
0:32:37 load avg: 1.64 Re-running test_concurrent_futures in verbose mode
(...)

======================================================================
ERROR: test_shutdown_no_wait (test.test_concurrent_futures.ProcessPoolForkProcessPoolShutdownTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_concurrent_futures.py", line 542, in test_shutdown_no_wait
    executor.shutdown(wait=False)
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/concurrent/futures/process.py", line 724, in shutdown
    self._executor_manager_thread_wakeup.wakeup()
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/concurrent/futures/process.py", line 80, in wakeup
    self._writer.send_bytes(b"")
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/multiprocessing/connection.py", line 205, in send_bytes
    self._send_bytes(m[offset:offset + size])
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/multiprocessing/connection.py", line 416, in _send_bytes
    self._send(header + buf)
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/multiprocessing/connection.py", line 373, in _send
    n = write(self._handle, buf)
OSError: [Errno 9] Bad file descriptor