STINNER Victor <vstin...@redhat.com> added the comment:

Another example:
https://travis-ci.org/python/cpython/jobs/506338756

0:06:39 load avg: 4.23 [326/416/1] test_concurrent_futures failed -- running: 
test_multiprocessing_spawn (1 min 27 sec)
Traceback:
 Thread 0x00002b2b1c243700 (most recent call first):
  File "/home/travis/build/python/cpython/Lib/threading.py", line 296 in wait
  File "/home/travis/build/python/cpython/Lib/multiprocessing/queues.py", line 
224 in _feed
  File "/home/travis/build/python/cpython/Lib/threading.py", line 865 in run
  File "/home/travis/build/python/cpython/Lib/threading.py", line 917 in 
_bootstrap_inner
  File "/home/travis/build/python/cpython/Lib/threading.py", line 885 in 
_bootstrap
Thread 0x00002b2b1c65a700 (most recent call first):
  File "/home/travis/build/python/cpython/Lib/selectors.py", line 415 in select
  File "/home/travis/build/python/cpython/Lib/multiprocessing/connection.py", 
line 920 in wait
  File "/home/travis/build/python/cpython/Lib/concurrent/futures/process.py", 
line 354 in _queue_management_worker
  File "/home/travis/build/python/cpython/Lib/threading.py", line 865 in run
  File "/home/travis/build/python/cpython/Lib/threading.py", line 917 in 
_bootstrap_inner
  File "/home/travis/build/python/cpython/Lib/threading.py", line 885 in 
_bootstrap
Current thread 0x00002b2b150439c0 (most recent call first):
  File "/home/travis/build/python/cpython/Lib/test/test_concurrent_futures.py", 
line 901 in _fail_on_deadlock
  File "/home/travis/build/python/cpython/Lib/test/test_concurrent_futures.py", 
line 962 in test_crash
  File "/home/travis/build/python/cpython/Lib/unittest/case.py", line 615 in run
  File "/home/travis/build/python/cpython/Lib/unittest/case.py", line 663 in 
__call__
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 122 in 
run
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 84 in 
__call__
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 122 in 
run
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 84 in 
__call__
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 122 in 
run
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 84 in 
__call__
  File "/home/travis/build/python/cpython/Lib/unittest/runner.py", line 176 in 
run
  File "/home/travis/build/python/cpython/Lib/test/support/__init__.py", line 
1899 in _run_suite
  File "/home/travis/build/python/cpython/Lib/test/support/__init__.py", line 
1995 in run_unittest
  File "/home/travis/build/python/cpython/Lib/test/test_concurrent_futures.py", 
line 1213 in test_main
  File "/home/travis/build/python/cpython/Lib/test/support/__init__.py", line 
2127 in decorator
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/runtest.py", 
line 182 in runtest_inner
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/runtest.py", 
line 127 in runtest
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/runtest_mp.py", 
line 68 in run_tests_worker
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/main.py", line 
600 in _main
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/main.py", line 
586 in main
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/main.py", line 
640 in main
  File "/home/travis/build/python/cpython/Lib/test/regrtest.py", line 46 in 
_main
  File "/home/travis/build/python/cpython/Lib/test/regrtest.py", line 50 in 
<module>
  File "/home/travis/build/python/cpython/Lib/runpy.py", line 85 in _run_code
  File "/home/travis/build/python/cpython/Lib/runpy.py", line 193 in 
_run_module_as_main
test_cancel (test.test_concurrent_futures.FutureTests) ... ok
test_cancelled (test.test_concurrent_futures.FutureTests) ... ok
test_done (test.test_concurrent_futures.FutureTests) ... ok
test_done_callback_already_cancelled (test.test_concurrent_futures.FutureTests) 
... ok
test_done_callback_already_failed (test.test_concurrent_futures.FutureTests) 
... ok
test_done_callback_already_successful 
(test.test_concurrent_futures.FutureTests) ... ok
test_done_callback_raises (test.test_concurrent_futures.FutureTests) ... ok
test_done_callback_with_cancel (test.test_concurrent_futures.FutureTests) ... ok
test_done_callback_with_exception (test.test_concurrent_futures.FutureTests) 
... ok
test_done_callback_with_result (test.test_concurrent_futures.FutureTests) ... ok
test_exception_with_success (test.test_concurrent_futures.FutureTests) ... ok
test_exception_with_timeout (test.test_concurrent_futures.FutureTests) ... ok
test_repr (test.test_concurrent_futures.FutureTests) ... ok
test_result_with_cancel (test.test_concurrent_futures.FutureTests) ... ok
test_result_with_success (test.test_concurrent_futures.FutureTests) ... ok
test_result_with_timeout (test.test_concurrent_futures.FutureTests) ... ok
test_running (test.test_concurrent_futures.FutureTests) ... ok
test_correct_timeout_exception_msg 
(test.test_concurrent_futures.ProcessPoolForkAsCompletedTest) ... 0.15s ok
test_duplicate_futures 
(test.test_concurrent_futures.ProcessPoolForkAsCompletedTest) ... 2.14s ok
test_free_reference_yielded_future 
(test.test_concurrent_futures.ProcessPoolForkAsCompletedTest) ... 0.16s ok
test_no_timeout (test.test_concurrent_futures.ProcessPoolForkAsCompletedTest) 
... 0.14s ok
test_zero_timeout (test.test_concurrent_futures.ProcessPoolForkAsCompletedTest) 
... 2.16s ok
test_crash (test.test_concurrent_futures.ProcessPoolForkExecutorDeadlockTest) 
... 28.53s test_shutdown_deadlock 
(test.test_concurrent_futures.ProcessPoolForkExecutorDeadlockTest) ... 0.46s ok
test_initializer 
(test.test_concurrent_futures.ProcessPoolForkFailingInitializerTest) ... 0.13s 
ok
test_initializer (test.test_concurrent_futures.ProcessPoolForkInitializerTest) 
... 0.12s ok
test_free_reference 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.17s 
ok
test_killed_child 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.16s 
ok
test_map (test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) 
... 0.16s ok
test_map_chunksize 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.16s 
ok
test_map_exception 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.18s 
ok
test_map_timeout 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 6.16s 
ok
test_max_workers_negative 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.15s 
ok
test_no_stale_references 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.16s 
ok
test_ressources_gced_in_workers 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.29s 
ok
test_shutdown_race_issue12456 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.16s 
ok
test_submit 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.14s 
ok
test_submit_keyword 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.16s 
ok
test_traceback 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest) ... 0.15s 
ok
test_context_manager_shutdown 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolShutdownTest) ... 0.05s 
ok
test_del_shutdown 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolShutdownTest) ... 0.06s 
ok
test_hang_issue12364 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolShutdownTest) ... 1.05s 
ok
test_interpreter_shutdown 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolShutdownTest) ... 1.64s 
ok
test_processes_terminate 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolShutdownTest) ... 0.05s 
ok
test_run_after_shutdown 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolShutdownTest) ... 0.00s 
ok
test_submit_after_interpreter_shutdown 
(test.test_concurrent_futures.ProcessPoolForkProcessPoolShutdownTest) ... 0.40s 
ok
test_all_completed (test.test_concurrent_futures.ProcessPoolForkWaitTest) ... 
0.16s ok
test_first_completed (test.test_concurrent_futures.ProcessPoolForkWaitTest) ... 
1.66s ok
test_first_completed_some_already_completed 
(test.test_concurrent_futures.ProcessPoolForkWaitTest) ... 1.66s ok
test_first_exception_one_already_failed 
(test.test_concurrent_futures.ProcessPoolForkWaitTest) ... 2.16s ok
test_first_exception_some_already_complete 
(test.test_concurrent_futures.ProcessPoolForkWaitTest) ... 1.65s ok
test_timeout (test.test_concurrent_futures.ProcessPoolForkWaitTest) ... 6.14s ok
test_correct_timeout_exception_msg 
(test.test_concurrent_futures.ProcessPoolForkserverAsCompletedTest) ... 0.86s ok
test_duplicate_futures 
(test.test_concurrent_futures.ProcessPoolForkserverAsCompletedTest) ... 2.54s ok
test_free_reference_yielded_future 
(test.test_concurrent_futures.ProcessPoolForkserverAsCompletedTest) ... 0.49s ok
test_no_timeout 
(test.test_concurrent_futures.ProcessPoolForkserverAsCompletedTest) ... 0.53s ok
test_zero_timeout 
(test.test_concurrent_futures.ProcessPoolForkserverAsCompletedTest) ... 2.50s ok
test_crash 
(test.test_concurrent_futures.ProcessPoolForkserverExecutorDeadlockTest) ... 
3.96s ok
test_shutdown_deadlock 
(test.test_concurrent_futures.ProcessPoolForkserverExecutorDeadlockTest) ... 
1.16s ok
test_initializer 
(test.test_concurrent_futures.ProcessPoolForkserverFailingInitializerTest) ... 
0.39s ok
test_initializer 
(test.test_concurrent_futures.ProcessPoolForkserverInitializerTest) ... 0.31s ok
test_free_reference 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.66s ok
test_killed_child 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.62s ok
test_map 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.63s ok
test_map_chunksize 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.66s ok
test_map_exception 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.68s ok
test_map_timeout 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
6.58s ok
test_max_workers_negative 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.58s ok
test_no_stale_references 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.62s ok
test_ressources_gced_in_workers 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.96s ok
test_shutdown_race_issue12456 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.60s ok
test_submit 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.63s ok
test_submit_keyword 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.64s ok
test_traceback 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolExecutorTest) ... 
0.55s ok
test_context_manager_shutdown 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolShutdownTest) ... 
0.05s ok
test_del_shutdown 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolShutdownTest) ... 
0.05s ok
test_hang_issue12364 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolShutdownTest) ... 
1.44s ok
test_interpreter_shutdown 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolShutdownTest) ... 
1.99s ok
test_processes_terminate 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolShutdownTest) ... 
0.40s ok
test_run_after_shutdown 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolShutdownTest) ... 
0.00s ok
test_submit_after_interpreter_shutdown 
(test.test_concurrent_futures.ProcessPoolForkserverProcessPoolShutdownTest) ... 
0.42s ok
test_all_completed (test.test_concurrent_futures.ProcessPoolForkserverWaitTest) 
... 0.56s ok
test_first_completed 
(test.test_concurrent_futures.ProcessPoolForkserverWaitTest) ... 2.07s ok
test_first_completed_some_already_completed 
(test.test_concurrent_futures.ProcessPoolForkserverWaitTest) ... 1.96s ok
test_first_exception 
(test.test_concurrent_futures.ProcessPoolForkserverWaitTest) ... 3.54s ok
test_first_exception_one_already_failed 
(test.test_concurrent_futures.ProcessPoolForkserverWaitTest) ... 2.43s ok
test_first_exception_some_already_complete 
(test.test_concurrent_futures.ProcessPoolForkserverWaitTest) ... 2.00s ok
test_timeout (test.test_concurrent_futures.ProcessPoolForkserverWaitTest) ... 
6.56s ok
test_correct_timeout_exception_msg 
(test.test_concurrent_futures.ProcessPoolSpawnAsCompletedTest) ... 1.11s ok
test_duplicate_futures 
(test.test_concurrent_futures.ProcessPoolSpawnAsCompletedTest) ... 3.15s ok
test_free_reference_yielded_future 
(test.test_concurrent_futures.ProcessPoolSpawnAsCompletedTest) ... 1.24s ok
test_no_timeout (test.test_concurrent_futures.ProcessPoolSpawnAsCompletedTest) 
... 1.17s ok
test_zero_timeout 
(test.test_concurrent_futures.ProcessPoolSpawnAsCompletedTest) ... 3.17s ok
test_crash (test.test_concurrent_futures.ProcessPoolSpawnExecutorDeadlockTest) 
... 11.24s ok
test_shutdown_deadlock 
(test.test_concurrent_futures.ProcessPoolSpawnExecutorDeadlockTest) ... 2.00s ok
test_initializer 
(test.test_concurrent_futures.ProcessPoolSpawnFailingInitializerTest) ... 0.55s 
ok
test_initializer (test.test_concurrent_futures.ProcessPoolSpawnInitializerTest) 
... 0.54s ok
test_free_reference 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
1.20s ok
test_killed_child 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
0.97s ok
test_map (test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) 
... 1.23s ok
test_map_chunksize 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
1.18s ok
test_map_exception 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
1.15s ok
test_map_timeout 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
7.19s ok
test_max_workers_negative 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
1.37s ok
test_no_stale_references 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
1.23s ok
test_ressources_gced_in_workers 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
1.49s ok
test_shutdown_race_issue12456 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
1.11s ok
test_submit 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
1.07s ok
test_submit_keyword 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
1.20s ok
test_traceback 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 
1.22s ok
test_del_shutdown 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolShutdownTest) ... 
0.07s ok
test_hang_issue12364 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolShutdownTest) ... 
2.12s ok
test_interpreter_shutdown 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolShutdownTest) ... 
2.34s ok
test_processes_terminate 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolShutdownTest) ... 
1.27s ok
test_run_after_shutdown 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolShutdownTest) ... 
0.00s ok
test_submit_after_interpreter_shutdown 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolShutdownTest) ... 
0.97s ok
test_all_completed (test.test_concurrent_futures.ProcessPoolSpawnWaitTest) ... 
1.24s ok
test_first_completed (test.test_concurrent_futures.ProcessPoolSpawnWaitTest) 
... 2.51s ok
test_first_completed_some_already_completed 
(test.test_concurrent_futures.ProcessPoolSpawnWaitTest) ... 2.77s ok
test_first_exception (test.test_concurrent_futures.ProcessPoolSpawnWaitTest) 
... 4.22s ok
test_first_exception_one_already_failed 
(test.test_concurrent_futures.ProcessPoolSpawnWaitTest) ... 3.18s ok
test_first_exception_some_already_complete 
(test.test_concurrent_futures.ProcessPoolSpawnWaitTest) ... 2.98s ok
test_timeout (test.test_concurrent_futures.ProcessPoolSpawnWaitTest) ... 7.26s 
ok
test_correct_timeout_exception_msg 
(test.test_concurrent_futures.ThreadPoolAsCompletedTest) ... 0.11s ok
test_duplicate_futures (test.test_concurrent_futures.ThreadPoolAsCompletedTest) 
... 2.13s ok
test_free_reference_yielded_future 
(test.test_concurrent_futures.ThreadPoolAsCompletedTest) ... 0.12s ok
test_no_timeout (test.test_concurrent_futures.ThreadPoolAsCompletedTest) ... 
0.13s ok
test_zero_timeout (test.test_concurrent_futures.ThreadPoolAsCompletedTest) ... 
2.13s ok
test_default_workers (test.test_concurrent_futures.ThreadPoolExecutorTest) ... 
0.13s ok
test_free_reference (test.test_concurrent_futures.ThreadPoolExecutorTest) ... 
0.12s ok
test_map (test.test_concurrent_futures.ThreadPoolExecutorTest) ... 0.14s ok
test_map_exception (test.test_concurrent_futures.ThreadPoolExecutorTest) ... 
0.13s ok
test_map_submits_without_iteration 
(test.test_concurrent_futures.ThreadPoolExecutorTest)
Tests verifying issue 11777. ... 0.14s ok
test_map_timeout (test.test_concurrent_futures.ThreadPoolExecutorTest) ... 
6.15s ok
test_max_workers_negative (test.test_concurrent_futures.ThreadPoolExecutorTest) 
... 0.14s ok
test_no_stale_references (test.test_concurrent_futures.ThreadPoolExecutorTest) 
... 0.13s ok
test_shutdown_race_issue12456 
(test.test_concurrent_futures.ThreadPoolExecutorTest) ... 0.14s ok
test_submit (test.test_concurrent_futures.ThreadPoolExecutorTest) ... 0.12s ok
test_submit_keyword (test.test_concurrent_futures.ThreadPoolExecutorTest) ... 
0.13s ok
test_initializer 
(test.test_concurrent_futures.ThreadPoolFailingInitializerTest) ... 0.11s ok
test_initializer (test.test_concurrent_futures.ThreadPoolInitializerTest) ... 
0.11s ok
test_context_manager_shutdown 
(test.test_concurrent_futures.ThreadPoolShutdownTest) ... 0.02s ok
test_del_shutdown (test.test_concurrent_futures.ThreadPoolShutdownTest) ... 
0.02s ok
test_hang_issue12364 (test.test_concurrent_futures.ThreadPoolShutdownTest) ... 
1.03s ok
test_interpreter_shutdown (test.test_concurrent_futures.ThreadPoolShutdownTest) 
... 1.52s ok
test_run_after_shutdown (test.test_concurrent_futures.ThreadPoolShutdownTest) 
... 0.00s ok
test_submit_after_interpreter_shutdown 
(test.test_concurrent_futures.ThreadPoolShutdownTest) ... 0.23s ok
test_thread_names_assigned 
(test.test_concurrent_futures.ThreadPoolShutdownTest) ... 0.03s ok
test_thread_names_default (test.test_concurrent_futures.ThreadPoolShutdownTest) 
... 0.03s ok
test_threads_terminate (test.test_concurrent_futures.ThreadPoolShutdownTest) 
... 0.03s ok
test_all_completed (test.test_concurrent_futures.ThreadPoolWaitTests) ... 0.13s 
ok
test_first_completed (test.test_concurrent_futures.ThreadPoolWaitTests) ... 
1.63s ok
test_first_completed_some_already_completed 
(test.test_concurrent_futures.ThreadPoolWaitTests) ... 1.63s ok
test_first_exception (test.test_concurrent_futures.ThreadPoolWaitTests) ... 
3.13s ok
test_first_exception_one_already_failed 
(test.test_concurrent_futures.ThreadPoolWaitTests) ... 2.15s ok
test_first_exception_some_already_complete 
(test.test_concurrent_futures.ThreadPoolWaitTests) ... 1.63s ok
test_pending_calls_race (test.test_concurrent_futures.ThreadPoolWaitTests) ... 
0.14s ok
test_timeout (test.test_concurrent_futures.ThreadPoolWaitTests) ... 6.15s ok
======================================================================
FAIL: test_crash 
(test.test_concurrent_futures.ProcessPoolForkExecutorDeadlockTest) [crash at 
task unpickle]
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/python/cpython/Lib/test/test_concurrent_futures.py", 
line 958, in test_crash
    res.result(timeout=self.TIMEOUT)
  File "/home/travis/build/python/cpython/Lib/concurrent/futures/_base.py", 
line 434, in result
    raise TimeoutError()
concurrent.futures._base.TimeoutError
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/home/travis/build/python/cpython/Lib/test/test_concurrent_futures.py", 
line 962, in test_crash
    self._fail_on_deadlock(executor)
  File "/home/travis/build/python/cpython/Lib/test/test_concurrent_futures.py", 
line 910, in _fail_on_deadlock
    self.fail(f"Executor deadlock:\n\n{tb}")
AssertionError: Executor deadlock:
Thread 0x00002b2b1c243700 (most recent call first):
  File "/home/travis/build/python/cpython/Lib/threading.py", line 296 in wait
  File "/home/travis/build/python/cpython/Lib/multiprocessing/queues.py", line 
224 in _feed
  File "/home/travis/build/python/cpython/Lib/threading.py", line 865 in run
  File "/home/travis/build/python/cpython/Lib/threading.py", line 917 in 
_bootstrap_inner
  File "/home/travis/build/python/cpython/Lib/threading.py", line 885 in 
_bootstrap
Thread 0x00002b2b1c65a700 (most recent call first):
  File "/home/travis/build/python/cpython/Lib/selectors.py", line 415 in select
  File "/home/travis/build/python/cpython/Lib/multiprocessing/connection.py", 
line 920 in wait
  File "/home/travis/build/python/cpython/Lib/concurrent/futures/process.py", 
line 354 in _queue_management_worker
  File "/home/travis/build/python/cpython/Lib/threading.py", line 865 in run
  File "/home/travis/build/python/cpython/Lib/threading.py", line 917 in 
_bootstrap_inner
  File "/home/travis/build/python/cpython/Lib/threading.py", line 885 in 
_bootstrap
Current thread 0x00002b2b150439c0 (most recent call first):
  File "/home/travis/build/python/cpython/Lib/test/test_concurrent_futures.py", 
line 901 in _fail_on_deadlock
  File "/home/travis/build/python/cpython/Lib/test/test_concurrent_futures.py", 
line 962 in test_crash
  File "/home/travis/build/python/cpython/Lib/unittest/case.py", line 615 in run
  File "/home/travis/build/python/cpython/Lib/unittest/case.py", line 663 in 
__call__
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 122 in 
run
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 84 in 
__call__
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 122 in 
run
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 84 in 
__call__
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 122 in 
run
  File "/home/travis/build/python/cpython/Lib/unittest/suite.py", line 84 in 
__call__
  File "/home/travis/build/python/cpython/Lib/unittest/runner.py", line 176 in 
run
  File "/home/travis/build/python/cpython/Lib/test/support/__init__.py", line 
1899 in _run_suite
  File "/home/travis/build/python/cpython/Lib/test/support/__init__.py", line 
1995 in run_unittest
  File "/home/travis/build/python/cpython/Lib/test/test_concurrent_futures.py", 
line 1213 in test_main
  File "/home/travis/build/python/cpython/Lib/test/support/__init__.py", line 
2127 in decorator
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/runtest.py", 
line 182 in runtest_inner
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/runtest.py", 
line 127 in runtest
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/runtest_mp.py", 
line 68 in run_tests_worker
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/main.py", line 
600 in _main
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/main.py", line 
586 in main
  File "/home/travis/build/python/cpython/Lib/test/libregrtest/main.py", line 
640 in main
  File "/home/travis/build/python/cpython/Lib/test/regrtest.py", line 46 in 
_main
  File "/home/travis/build/python/cpython/Lib/test/regrtest.py", line 50 in 
<module>
  File "/home/travis/build/python/cpython/Lib/runpy.py", line 85 in _run_code
  File "/home/travis/build/python/cpython/Lib/runpy.py", line 193 in 
_run_module_as_main
----------------------------------------------------------------------
Ran 160 tests in 224.305s
FAILED (failures=1)
test test_concurrent_futures failed

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35809>
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