[issue38790] test_fcntl failing on macOS CI

[Ned Deily]

Change by Ned Deily :


--
resolution:  -> duplicate
stage: patch review -> resolved
status: open -> closed
superseder:  -> Add open_file_descriptor parameter to fcntl.lockf() (use the 
new F_OFD_SETLK flag)

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[issue38790] test_fcntl failing on macOS CI

[Dong-hee Na]

Dong-hee Na  added the comment:

This cause of failure PR 17010 was due to change of start methods as follows:
https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods
Changed in version 3.8: On macOS, the spawn start method is now the default. 
The fork start method should be considered unsafe as it can lead to crashes of 
the subprocess. See bpo-33725.


So I updated the test through PR 17154 and I check that my local mac machine 
works well. (I did not check it on my local mac machine when I submitted PR 
17010 since open description lock was Linux feature, this was my mistake)

And thanks to the tip from Michael Felt, I update the test to skip on the AIX 
machine. So I expect that when PR 17154 is landed, everything will go well.

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[issue38790] test_fcntl failing on macOS CI

[Dong-hee Na]

Change by Dong-hee Na :


--
versions: +Python 3.7, Python 3.8, Python 3.9

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[issue38790] test_fcntl failing on macOS CI

[Dong-hee Na]

Dong-hee Na  added the comment:

This issue was reported from victor

See https://bugs.python.org/msg356607
And I attached the patch for this on GH 17154.
Please take a look at the patch also.

I apologize for the trouble as the original test code author.

--
keywords: +patch
message_count: 1.0 -> 2.0
nosy: +corona10
nosy_count: 4.0 -> 5.0
pull_requests: +16697
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/17154

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[issue38790] test_fcntl failing on macOS CI

[Steve Dower]

New submission from Steve Dower :

See 
https://dev.azure.com/Python/cpython/_build/results?buildId=53812=ms.vss-test-web.build-test-results-tab

Traceback (most recent call last):
  File "/Users/runner/runners/2.160.0/work/1/s/Lib/unittest/case.py", line 60, 
in testPartExecutor
yield
  File "/Users/runner/runners/2.160.0/work/1/s/Lib/unittest/case.py", line 659, 
in run
self._callTestMethod(testMethod)
  File "/Users/runner/runners/2.160.0/work/1/s/Lib/unittest/case.py", line 616, 
in _callTestMethod
method()
  File "/Users/runner/runners/2.160.0/work/1/s/Lib/test/test_fcntl.py", line 
149, in test_lockf_exclusive
p.start()
  File "/Users/runner/runners/2.160.0/work/1/s/Lib/multiprocessing/process.py", 
line 121, in start
self._popen = self._Popen(self)
  File "/Users/runner/runners/2.160.0/work/1/s/Lib/multiprocessing/context.py", 
line 224, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
  File "/Users/runner/runners/2.160.0/work/1/s/Lib/multiprocessing/context.py", 
line 283, in _Popen
return Popen(process_obj)
  File 
"/Users/runner/runners/2.160.0/work/1/s/Lib/multiprocessing/popen_spawn_posix.py",
 line 32, in __init__
super().__init__(process_obj)
  File 
"/Users/runner/runners/2.160.0/work/1/s/Lib/multiprocessing/popen_fork.py", 
line 19, in __init__
self._launch(process_obj)
  File 
"/Users/runner/runners/2.160.0/work/1/s/Lib/multiprocessing/popen_spawn_posix.py",
 line 47, in _launch
reduction.dump(process_obj, fp)
  File 
"/Users/runner/runners/2.160.0/work/1/s/Lib/multiprocessing/reduction.py", line 
60, in dump
ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 
'TestFcntl.test_lockf_exclusive..try_lockf_on_other_process'

--
components: Tests, macOS
messages: 356565
nosy: alexandre.vassalotti, ned.deily, ronaldoussoren, steve.dower
priority: normal
severity: normal
stage: needs patch
status: open
title: test_fcntl failing on macOS CI
type: behavior

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