test_multiprocessing_forkserver.py, test_multiprocessing_fork.py and test_multiprocessing_spawn.py gives tracebacks

報告された Python 3.11 Linux 環境で、test_multiprocessing_forkserver.py、test_multiprocessing_fork.py、test_multiprocessing_spawn.py を使って失敗を再現する。multiprocessing/resource_tracker.py の 209 行付近を読み、pull request 95396 で言及されている KeyError のケースと比較する。これらの traceback が想定されたものかどうかを確認し、想定されたものでない場合は、影響を受けるテストが traceback なしで完了するようにすれば完了とする。

Bug report

During build RPM for python3.11rc1 I've found tracebacks for tests from test suite test_multiprocessing_forkserver.py, test_multiprocessing_fork.py, and test_multiprocessing_spawn.py :

[root@xxx test]# python3.11 test_multiprocessing_forkserver.py
............s..................................................s...............................s.s.s.....s...s...........ss.....s......................................................................................................................................Traceback (most recent call last):
  File "/opt/rh/rh-python311/root/usr/lib64/python3.11/multiprocessing/resource_tracker.py", line 209, in main
.    cache[rtype].remove(name)
KeyError: '/psm_8714e59f'
..............................ssss...............................s.........ss.ss..sss.sss.s.ssss......ss....s.
----------------------------------------------------------------------
Ran 374 tests in 75.001s

OK (skipped=33)
[root@xxx test]# python3.11 test_multiprocessing_spawn.py
............s..............s...................................s...............................s.s.s.....s...s...........ss.....s...............................................................................................ss.....................................Traceback (most recent call last):
  File "/opt/rh/rh-python311/root/usr/lib64/python3.11/multiprocessing/resource_tracker.py", line 209, in main
.    cache[rtype].remove(name)
KeyError: '/psm_e93c9b17'
..............................ssss...............................s.........ss.ss..sss.sss.s.ssss......ss....s.
----------------------------------------------------------------------
Ran 374 tests in 118.379s

OK (skipped=36)

[root@xxx test]# python3.11 test_multiprocessing_fork.py
............s..............s...................................s...............................s.s.s.....s...s...........ss.....s........................................................................................s......ss.....................................Traceback (most recent call last):
  File "/opt/rh/rh-python311/root/usr/lib64/python3.11/multiprocessing/resource_tracker.py", line 209, in main
.    cache[rtype].remove(name)
KeyError: '/psm_1324c68a'
..............................ssss...............................s.........ss.ss..sss.sss.s.ssss......ss....s.
----------------------------------------------------------------------
Ran 374 tests in 67.935s

OK (skipped=37)

I suppose, that tracebacks are not ok during test. Or close the bug, if it normal.
Some KeyError are present in https://github.com/python/cpython/pull/95396.

Your environment

Python 3.11.0rc1 (main, Aug 13 2022, 18:23:13) [GCC 9.3.1 20200408 (Red Hat 9.3.1-2)] on linux
Centos7 x86_64, python 3.11rc1