$ ./python -m test test_concurrent_futures.test_shutdown -m test_processes_terminate -v -R 3:3 --timeout=15(...)OK.test_processes_terminate (test.test_concurrent_futures.test_shutdown.ProcessPoolForkProcessPoolShutdownTest.test_processes_terminate) ... /home/vstinner/python/main/Lib/multiprocessing/popen_fork.py:67: DeprecationWarning: This process (pid=290121) is multi-threaded, use of fork() may lead to deadlocks in the child.  self.pid = os.fork()0.02s oktest_processes_terminate (test.test_concurrent_futures.test_shutdown.ProcessPoolForkserverProcessPoolShutdownTest.test_processes_terminate) ... 0.22s oktest_processes_terminate (test.test_concurrent_futures.test_shutdown.ProcessPoolSpawnProcessPoolShutdownTest.test_processes_terminate) ... Timeout (0:00:15)!Thread 0x00007f955fe006c0 (most recent call first):  File "/home/vstinner/python/main/Lib/concurrent/futures/process.py", line 182 in _on_queue_feeder_error  File "/home/vstinner/python/main/Lib/multiprocessing/queues.py", line 290 in _feed  File "/home/vstinner/python/main/Lib/threading.py", line 992 in run  File "/home/vstinner/python/main/Lib/threading.py", line 1041 in _bootstrap_inner  File "/home/vstinner/python/main/Lib/threading.py", line 1012 in _bootstrapThread 0x00007f9564c006c0 (most recent call first):  File "/home/vstinner/python/main/Lib/threading.py", line 1092 in join  File "/home/vstinner/python/main/Lib/multiprocessing/queues.py", line 217 in _finalize_join  File "/home/vstinner/python/main/Lib/multiprocessing/util.py", line 216 in __call__  File "/home/vstinner/python/main/Lib/multiprocessing/queues.py", line 149 in join_thread  File "/home/vstinner/python/main/Lib/concurrent/futures/process.py", line 566 in _join_executor_internals  File "/home/vstinner/python/main/Lib/concurrent/futures/process.py", line 557 in join_executor_internals  File "/home/vstinner/python/main/Lib/concurrent/futures/process.py", line 380 in run  File "/home/vstinner/python/main/Lib/threading.py", line 1041 in _bootstrap_inner  File "/home/vstinner/python/main/Lib/threading.py", line 1012 in _bootstrapThread 0x00007f9573c83740 (most recent call first):  File "/home/vstinner/python/main/Lib/threading.py", line 1092 in join  File "/home/vstinner/python/main/Lib/concurrent/futures/process.py", line 854 in shutdown  File "/home/vstinner/python/main/Lib/test/test_concurrent_futures/test_shutdown.py", line 274 in test_processes_terminate  File "/home/vstinner/python/main/Lib/unittest/case.py", line 606 in _callTestMethod  File "/home/vstinner/python/main/Lib/unittest/case.py", line 660 in run  File "/home/vstinner/python/main/Lib/unittest/case.py", line 716 in __call__  File "/home/vstinner/python/main/Lib/unittest/suite.py", line 122 in run  File "/home/vstinner/python/main/Lib/unittest/suite.py", line 84 in __call__  File "/home/vstinner/python/main/Lib/unittest/suite.py", line 122 in run  File "/home/vstinner/python/main/Lib/unittest/suite.py", line 84 in __call__  File "/home/vstinner/python/main/Lib/unittest/runner.py", line 240 in run  File "/home/vstinner/python/main/Lib/test/libregrtest/single.py", line 57 in _run_suite  File "/home/vstinner/python/main/Lib/test/libregrtest/single.py", line 37 in run_unittest  File "/home/vstinner/python/main/Lib/test/libregrtest/single.py", line 135 in test_func  File "/home/vstinner/python/main/Lib/test/libregrtest/refleak.py", line 132 in runtest_refleak  File "/home/vstinner/python/main/Lib/test/libregrtest/single.py", line 87 in regrtest_runner  File "/home/vstinner/python/main/Lib/test/libregrtest/single.py", line 138 in _load_run_test  File "/home/vstinner/python/main/Lib/test/libregrtest/single.py", line 181 in _runtest_env_changed_exc  File "/home/vstinner/python/main/Lib/test/libregrtest/single.py", line 281 in _runtest  File "/home/vstinner/python/main/Lib/test/libregrtest/single.py", line 310 in run_single_test  File "/home/vstinner/python/main/Lib/test/libregrtest/main.py", line 363 in run_test  File "/home/vstinner/python/main/Lib/test/libregrtest/main.py", line 397 in run_tests_sequentially  File "/home/vstinner/python/main/Lib/test/libregrtest/main.py", line 541 in _run_tests  File "/home/vstinner/python/main/Lib/test/libregrtest/main.py", line 576 in run_tests  File "/home/vstinner/python/main/Lib/test/libregrtest/main.py", line 739 in main  File "/home/vstinner/python/main/Lib/test/libregrtest/main.py", line 747 in main  File "/home/vstinner/python/main/Lib/test/__main__.py", line 2 in <module>  File "/home/vstinner/python/main/Lib/runpy.py", line 88 in _run_code  File "/home/vstinner/python/main/Lib/runpy.py", line 198 in _run_module_as_main