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Example of failure, with additional debug prints:
 
0:01:02 load avg: 42.13 [ 38/1] test_concurrent_futures failed (env changed) 
test_no_stale_references (test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 2.00s reap_children 
ok 
test_ressources_gced_in_workers (test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 3.86s reap_children 
ok 
test_shutdown_race_issue12456 (test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 2.22s reap_children 
ok 
test_submit (test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 2.26s reap_children 
ok 
test_submit_keyword (test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 1.59s reap_children 
ok 
test_traceback (test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest) ... 1.60s reap_children 
ok 
MP cleanup: cleanup process 
MP cleanup: stop forkserver 
MP cleanup: stop res track 
MP cleanup: run finalizers 
reap_children 
 
---------------------------------------------------------------------- 
 
Ran 6 tests in 17.210s 
 
OK 
reap_children 
Warning -- reap_children() reaped child process 4992 
Warning -- multiprocessing.process._dangling was modified by test_concurrent_futures 
 Before: set() 
 After: {<weakref at 0x7fedc87bc7d0; to 'SpawnProcess' at 0x7fedc7abcd70>}