Message 358548 - Python tracker

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>}