[271/356/1] test_concurrent_futures
Traceback (most recent call last):
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/multiprocessing/queues.py", line 268, in _feed
    send(obj)
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/multiprocessing/connection.py", line 229, in send
    self._send_bytes(memoryview(buf))
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/multiprocessing/connection.py", line 423, in _send_bytes
    self._send(struct.pack("=i", len(buf)))
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/multiprocessing/connection.py", line 392, in _send
    n = write(self._handle, buf)
OSError: [Errno 32] Broken pipe
Timeout (1:00:00)!
Thread 0x00000954:
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/threading.py", line 237 in wait
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/multiprocessing/queues.py", line 252 in _feed
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/threading.py", line 690 in run
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/threading.py", line 737 in _bootstrap_inner
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/threading.py", line 710 in _bootstrap

Thread 0x00000953:
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/multiprocessing/forking.py", line 146 in poll
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/multiprocessing/forking.py", line 166 in wait
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/multiprocessing/process.py", line 150 in join
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/concurrent/futures/process.py", line 208 in shutdown_worker
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/concurrent/futures/process.py", line 264 in _queue_management_worker
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/threading.py", line 690 in run
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/threading.py", line 737 in _bootstrap_inner
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/threading.py", line 710 in _bootstrap

Thread 0x00000001:
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/threading.py", line 237 in wait
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/threading.py", line 851 in join
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/concurrent/futures/process.py", line 395 in shutdown
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/test_concurrent_futures.py", line 67 in tearDown
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/case.py", line 407 in _executeTestPart
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/case.py", line 463 in run
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/case.py", line 514 in __call__
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/suite.py", line 105 in run
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/suite.py", line 67 in __call__
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/suite.py", line 105 in run
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/unittest/suite.py", line 67 in __call__
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/support.py", line 1166 in run
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/support.py", line 1254 in _run_suite
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/support.py", line 1280 in run_unittest
  File "/home2/buildbot/slave/3.x.loewis-sun/build/Lib/test/test_concurrent_futures.py", line 628 in test_main
  File "./Lib/test/regrtest.py", line 1043 in runtest_inner
  File "./Lib/test/regrtest.py", line 841 in runtest
  File "./Lib/test/regrtest.py", line 668 in main
  File "./Lib/test/regrtest.py", line 1618 in <module>
*** Error code 1
make: Fatal error: Command failed for target `buildbottest'
program finished with exit code 1

See commit e6e7e42efdc2 of the issue #12310.