STINNER Victor <vstin...@python.org> added the comment:
I converted the example into attached file mp_exit.py and I added a call to faulthandler to see what is going on. Output with the master branch of Python: vstinner@apu$ ~/python/master/python ~/mp_exit.py Timeout (0:00:05)! Thread 0x00007ff40139a700 (most recent call first): File "/home/vstinner/python/master/Lib/multiprocessing/connection.py", line 379 in _recv File "/home/vstinner/python/master/Lib/multiprocessing/connection.py", line 414 in _recv_bytes File "/home/vstinner/python/master/Lib/multiprocessing/connection.py", line 250 in recv File "/home/vstinner/python/master/Lib/multiprocessing/pool.py", line 576 in _handle_results File "/home/vstinner/python/master/Lib/threading.py", line 882 in run File "/home/vstinner/python/master/Lib/threading.py", line 944 in _bootstrap_inner File "/home/vstinner/python/master/Lib/threading.py", line 902 in _bootstrap Thread 0x00007ff401b9b700 (most recent call first): File "/home/vstinner/python/master/Lib/multiprocessing/pool.py", line 528 in _handle_tasks File "/home/vstinner/python/master/Lib/threading.py", line 882 in run File "/home/vstinner/python/master/Lib/threading.py", line 944 in _bootstrap_inner File "/home/vstinner/python/master/Lib/threading.py", line 902 in _bootstrap Thread 0x00007ff40239c700 (most recent call first): File "/home/vstinner/python/master/Lib/selectors.py", line 415 in select File "/home/vstinner/python/master/Lib/multiprocessing/connection.py", line 930 in wait File "/home/vstinner/python/master/Lib/multiprocessing/pool.py", line 499 in _wait_for_updates File "/home/vstinner/python/master/Lib/multiprocessing/pool.py", line 519 in _handle_workers File "/home/vstinner/python/master/Lib/threading.py", line 882 in run File "/home/vstinner/python/master/Lib/threading.py", line 944 in _bootstrap_inner File "/home/vstinner/python/master/Lib/threading.py", line 902 in _bootstrap Thread 0x00007ff4102cf740 (most recent call first): File "/home/vstinner/python/master/Lib/threading.py", line 303 in wait File "/home/vstinner/python/master/Lib/threading.py", line 565 in wait File "/home/vstinner/python/master/Lib/multiprocessing/pool.py", line 759 in wait File "/home/vstinner/python/master/Lib/multiprocessing/pool.py", line 762 in get File "/home/vstinner/python/master/Lib/multiprocessing/pool.py", line 364 in map File "/home/vstinner/mp_exit.py", line 12 in <module> In the main process, Pool._handle_results() thread is blocked on os.read() which never completes, even if the child process died and so the other end of the pipe should be closed. ---------- Added file: https://bugs.python.org/file48603/mp_exit.py _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue38084> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
