New submission from Xinmeng Xia <[email protected]>:
The following code recursively calls function test_forkserver(). However, the
output is not expected RecursionError(recursively calling) or OSError(too many
open files). An unexpected EOFError ( inside module multiprocessing, not this
code itself) is reported. According to the error message, Python interpreter
seems to behavior abnormal on line 1, "import multiprocessing". I try other
cases in my machine, multiprocessing module can work well. Only this case will
crash module multiprocessing.
test.py
======================================
import multiprocessing
import os
def do(i):
print(test_forkserver(), os.getpid())
def test_forkserver():
mp = multiprocessing.get_context('forkserver')
mp.Pool(2).map(do(mp), range(3))
if __name__ == '__main__':
test_forkserver()
======================================
Attached output:
------------------------------------------------------------------
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/local/python3.10/lib/python3.10/multiprocessing/forkserver.py",
line 258, in main
fds = reduction.recvfds(s, MAXFDS_TO_SEND + 1)
File "/usr/local/python3.10/lib/python3.10/multiprocessing/reduction.py",
line 159, in recvfds
raise EOFError
EOFError
...
------------------------------------------------------------------
System Info:
>>uname -a
Linux xxm 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021 x86_64
x86_64 x86_64 GNU/Linux
>>python -V
Python 3.10.0a4
----------
components: Library (Lib)
messages: 386008
nosy: xxm
priority: normal
severity: normal
status: open
title: Recursive call crash module multiprocessing
type: crash
versions: Python 3.10
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Python tracker <[email protected]>
<https://bugs.python.org/issue43081>
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