GeezerVison

I suggest to either accept [1, 2] and [2, 1] in the test, or add some kind of synchronization to ensure that events happen in the expected order. Here I don't think that order matters.

The test was added by PR #108568 of issue gh-108520.

FAIL: test_nested_startmethod (test.test_multiprocessing_fork.test_misc.TestStartMethod.test_nested_startmethod)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-ppc64le.lto/build/Lib/test/_test_multiprocessing.py", line 5475, in test_nested_startmethod
    self.assertEqual(results, [2, 1])
AssertionError: Lists differ: [1, 2] != [2, 1]

First differing element 0:
1
2

- [1, 2]
+ [2, 1]

build: https://buildbot.python.org/all/#/builders/503/builds/3941

The failure can be reproduced by stressing the test:

$ ./python -m test test_multiprocessing_fork.test_misc -m test_nested_startmethod -v -j50 --forever
(...)
0:00:24 load avg: 20.03 [157/1] test_multiprocessing_fork.test_misc failed (1 failure)
test_nested_startmethod (test.test_multiprocessing_fork.test_misc.TestStartMethod.test_nested_startmethod) ... FAIL

======================================================================
FAIL: test_nested_startmethod (test.test_multiprocessing_fork.test_misc.TestStartMethod.test_nested_startmethod)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/vstinner/python/3.11/Lib/test/_test_multiprocessing.py", line 5399, in test_nested_startmethod
    self.assertEqual(results, [2, 1])
AssertionError: Lists differ: [1, 2] != [2, 1]

First differing element 0:
1
2

- [1, 2]
+ [2, 1]

----------------------------------------------------------------------
Ran 1 test in 2.150s

FAILED (failures=1)
test test_multiprocessing_fork.test_misc failed

Linked PRs

Activity

vstinner
added
testsTests in the Lib/test dirTests in the Lib/test dir
on Sep 22, 2023
vstinner
added 3 commits that reference this issue on Sep 22, 2023
pythongh-109706: Fix multiprocessing test_nested_startmethod()
85c918b
pythongh-109706: Fix multiprocessing test_nested_startmethod()
06aa63b
gh-109706: Fix multiprocessing test_nested_startmethod() (#109707)
b03a791
miss-islington
added 2 commits that reference this issue on Sep 22, 2023
pythongh-109706: Fix multiprocessing test_nested_startmethod() (pytho…
a83132f
pythongh-109706: Fix multiprocessing test_nested_startmethod() (pytho…
9b81414
vstinner
added a commit that references this issue on Sep 22, 2023
[3.11] gh-109706: Fix multiprocessing test_nested_startmethod() (GH-1…
3db2ec2
vstinner
closed this as completed on Sep 25, 2023
csm10495
added a commit that references this issue on Sep 28, 2023
pythongh-109706: Fix multiprocessing test_nested_startmethod() (pytho…
0066283
Yhg1s
added a commit that references this issue on Oct 2, 2023
[3.12] gh-109706: Fix multiprocessing test_nested_startmethod() (GH-1…
6a6bea3
Glyphack
added a commit that references this issue on Sep 2, 2024
pythongh-109706: Fix multiprocessing test_nested_startmethod() (pytho…
ba451d2

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