STINNER Victor <vstin...@python.org> added the comment:
On FreeBSD CURRENT worker, I reproduced the issue: "test_enter
(test.test_multiprocessing_fork.WithProcessesTestPool) ..." hangs.
Sadly I unblocked a process when I did a mistake in gdb while getting Python
tracebacks.
Process 90127:
90127 4 S+ 0:00.51 /usr/home/haypo/python/master/python -c from
multiprocessing.forkserver import main; main(8, 9, ['__main__',
'test.test_multiprocessing_forkserver'], **{'sys_path':
['/usr/home/haypo/python/master', '/usr/local/lib/python39.zip',
(gdb) py-bt
Traceback (most recent call first):
File "/usr/home/haypo/python/master/Lib/selectors.py", line 558, in select
kev_list = self._selector.control(None, max_ev, timeout)
File "/usr/home/haypo/python/master/Lib/multiprocessing/forkserver.py", line
986, in main
File "<string>", line 1, in <module>
Process 90645
cmdline = './python -m test -v test_multiprocessing_fork -F'
(gdb) py-bt
Traceback (most recent call first):
File "/usr/home/haypo/python/master/Lib/multiprocessing/synchronize.py", line
95, in __enter__
return self._semlock.__enter__()
File "/usr/home/haypo/python/master/Lib/multiprocessing/queues.py", line 355,
in get
with self._rlock:
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 370,
in worker
`func` and (a, b) becomes func(a, b).
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
108, in run
self._target(*self._args, **self._kwargs)
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
571, in _bootstrap
File "/usr/home/haypo/python/master/Lib/multiprocessing/popen_fork.py", line
75, in _launch
code = process_obj._bootstrap(parent_sentinel=child_r)
File "/usr/home/haypo/python/master/Lib/multiprocessing/popen_fork.py", line
19, in __init__
self._launch(process_obj)
File "/usr/home/haypo/python/master/Lib/multiprocessing/context.py", line
276, in _Popen
return Popen(process_obj)
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
633, in start
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 838,
in _repopulate_pool_static
self._cache = pool._cache
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 559,
in _repopulate_pool
outqueue.put(None)
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 212,
in __init__
self._repopulate_pool()
File "/usr/home/haypo/python/master/Lib/multiprocessing/context.py", line
375, in Pool
File "/usr/home/haypo/python/master/Lib/test/_test_multiprocessing.py", line
2338, in setUpClass
cls.pool = cls.Pool(4)
(...)
Process 90646 :
cmdline = './python -m test -v test_multiprocessing_fork -F'
(gdb) py-bt
Traceback (most recent call first):
<built-in method read of module object at remote 0x80120a350>
File "/usr/home/haypo/python/master/Lib/multiprocessing/connection.py", line
384, in _recv
chunk = read(handle, remaining)
File "/usr/home/haypo/python/master/Lib/multiprocessing/connection.py", line
419, in _recv_bytes
buf = self._recv(4)
File "/usr/home/haypo/python/master/Lib/multiprocessing/connection.py", line
221, in recv_bytes
buf = self._recv_bytes(maxlength)
File "/usr/home/haypo/python/master/Lib/multiprocessing/queues.py", line 356,
in get
res = self._reader.recv_bytes()
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 370,
in worker
`func` and (a, b) becomes func(a, b).
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
108, in run
self._target(*self._args, **self._kwargs)
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
571, in _bootstrap
File "/usr/home/haypo/python/master/Lib/multiprocessing/popen_fork.py", line
75, in _launch
code = process_obj._bootstrap(parent_sentinel=child_r)
File "/usr/home/haypo/python/master/Lib/multiprocessing/popen_fork.py", line
19, in __init__
self._launch(process_obj)
File "/usr/home/haypo/python/master/Lib/multiprocessing/context.py", line
276, in _Popen
return Popen(process_obj)
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
633, in start
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 838,
in _repopulate_pool_static
self._cache = pool._cache
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 559,
in _repopulate_pool
outqueue.put(None)
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 212,
in __init__
self._repopulate_pool()
File "/usr/home/haypo/python/master/Lib/multiprocessing/context.py", line
375, in Pool
File "/usr/home/haypo/python/master/Lib/test/_test_multiprocessing.py", line
2338, in setUpClass
cls.pool = cls.Pool(4)
(...)
Process 90648:
cmdline = './python -m test -v test_multiprocessing_fork -F'
(gdb) py-bt
Traceback (most recent call first):
File "/usr/home/haypo/python/master/Lib/multiprocessing/synchronize.py", line
95, in __enter__
return self._semlock.__enter__()
File "/usr/home/haypo/python/master/Lib/multiprocessing/queues.py", line 355,
in get
with self._rlock:
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 370,
in worker
`func` and (a, b) becomes func(a, b).
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
108, in run
self._target(*self._args, **self._kwargs)
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
571, in _bootstrap
File "/usr/home/haypo/python/master/Lib/multiprocessing/popen_fork.py", line
75, in _launch
code = process_obj._bootstrap(parent_sentinel=child_r)
File "/usr/home/haypo/python/master/Lib/multiprocessing/popen_fork.py", line
19, in __init__
self._launch(process_obj)
File "/usr/home/haypo/python/master/Lib/multiprocessing/context.py", line
276, in _Popen
return Popen(process_obj)
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
633, in start
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 838,
in _repopulate_pool_static
self._cache = pool._cache
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 559,
in _repopulate_pool
outqueue.put(None)
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 212,
in __init__
self._repopulate_pool()
File "/usr/home/haypo/python/master/Lib/multiprocessing/context.py", line
375, in Pool
File "/usr/home/haypo/python/master/Lib/test/_test_multiprocessing.py", line
2338, in setUpClass
cls.pool = cls.Pool(4)
(...)
Process 90654:
cmdline = './python -m test -v test_multiprocessing_fork -F'
(gdb) py-bt
Traceback (most recent call first):
File "/usr/home/haypo/python/master/Lib/multiprocessing/synchronize.py", line
95, in __enter__
return self._semlock.__enter__()
File "/usr/home/haypo/python/master/Lib/multiprocessing/queues.py", line 355,
in get
with self._rlock:
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 370,
in worker
`func` and (a, b) becomes func(a, b).
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
108, in run
self._target(*self._args, **self._kwargs)
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
571, in _bootstrap
File "/usr/home/haypo/python/master/Lib/multiprocessing/popen_fork.py", line
75, in _launch
code = process_obj._bootstrap(parent_sentinel=child_r)
File "/usr/home/haypo/python/master/Lib/multiprocessing/popen_fork.py", line
19, in __init__
self._launch(process_obj)
File "/usr/home/haypo/python/master/Lib/multiprocessing/context.py", line
276, in _Popen
return Popen(process_obj)
File "/usr/home/haypo/python/master/Lib/multiprocessing/process.py", line
633, in start
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 838,
in _repopulate_pool_static
self._cache = pool._cache
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 559,
in _repopulate_pool
outqueue.put(None)
File "/usr/home/haypo/python/master/Lib/multiprocessing/pool.py", line 212,
in __init__
self._repopulate_pool()
File "/usr/home/haypo/python/master/Lib/multiprocessing/context.py", line
375, in Pool
File "/usr/home/haypo/python/master/Lib/test/_test_multiprocessing.py", line
2664, in test_enter
pool = self.Pool(1)
(...)
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39996>
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