[New-bugs-announce] [issue38790] test_fcntl failing on macOS CI

[Steve Dower]

New submission from Steve Dower <steve.dower at python.org>:

See https://dev.azure.com/Python/cpython/_build/results?buildId=53812&view=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.<locals>.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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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38790>
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