STINNER Victor <[email protected]> added the comment:
Oh, I think that I found a deadlock (or something like that):
----------------------------
import concurrent.futures
import faulthandler
import os
import signal
import time
def work(n):
time.sleep(0.1)
def main():
faulthandler.register(signal.SIGUSR1)
print("pid: %s" % os.getpid())
with concurrent.futures.ProcessPoolExecutor() as executor:
for number, prime in executor.map(work, range(100)):
print("shutdown")
executor.shutdown()
print("shutdown--")
if __name__ == '__main__':
main()
----------------------------
Trace:
----------------------------
Thread 0x00007fbfc83bd700:
File "/home/haypo/prog/HG/cpython/Lib/threading.py", line 237 in wait
File "/home/haypo/prog/HG/cpython/Lib/multiprocessing/queues.py", line 252 in
_feed
File "/home/haypo/prog/HG/cpython/Lib/threading.py", line 690 in run
File "/home/haypo/prog/HG/cpython/Lib/threading.py", line 737 in
_bootstrap_inner
File "/home/haypo/prog/HG/cpython/Lib/threading.py", line 710 in _bootstrap
Thread 0x00007fbfc8bbe700:
File "/home/haypo/prog/HG/cpython/Lib/multiprocessing/queues.py", line 101 in
put
File "/home/haypo/prog/HG/cpython/Lib/concurrent/futures/process.py", line
268 in _queue_management_worker
File "/home/haypo/prog/HG/cpython/Lib/threading.py", line 690 in run
File "/home/haypo/prog/HG/cpython/Lib/threading.py", line 737 in
_bootstrap_inner
File "/home/haypo/prog/HG/cpython/Lib/threading.py", line 710 in _bootstrap
Current thread 0x00007fbfcc2e3700:
File "/home/haypo/prog/HG/cpython/Lib/threading.py", line 237 in wait
File "/home/haypo/prog/HG/cpython/Lib/threading.py", line 851 in join
File "/home/haypo/prog/HG/cpython/Lib/concurrent/futures/process.py", line
395 in shutdown
File "/home/haypo/prog/HG/cpython/Lib/concurrent/futures/_base.py", line 570
in __exit__
File "y.py", line 17 in main
File "y.py", line 20 in <module>
----------------------------
There are two child processes, but both are zombies (displayed as "<defunct>"
by ps). Send SIGUSR1 signal to the frozen process to display the traceback
(thanks to faulthandler).
----------
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Python tracker <[email protected]>
<http://bugs.python.org/issue12364>
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