[Bug 1904424] Re: oslo.service fails with python3.9 due to Semaphore() not implementing _at_fork_reinit

[Dimitri John Ledkov]

** Also affects: oslo.service
   Importance: Undecided
       Status: New

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Title:
  oslo.service fails with python3.9 due to Semaphore() not implementing
  _at_fork_reinit

Status in oslo.concurrency:
  New
Status in oslo.service:
  New
Status in python-oslo.concurrency package in Ubuntu:
  New
Status in python-oslo.service package in Ubuntu:
  New

Bug description:
  oslo.service fails with python3.9 due to Semaphore() not implementing
  _at_fork_reinit

  when testing oslo.service, it fails with AttributeErrors in python3.9,
  leading me to believe that oslo.concurrency is not compatible with
  python3.9 and i'm not sure how to fix it.

  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
  /autopkgtest-hirsute/hirsute/amd64/p/python-
  oslo.service/20201116_120433_0b2e5@/log.gz

  
  {0} oslo_service.tests.test_periodic.PeriodicTasksTestCase.test_called_correct [0.008885s] ... ok
     ERROR [oslo_service.periodic_task] Error during AService.crashit
  Traceback (most recent call last):
    File "/tmp/autopkgtest.yxXbpd/build.9dR/src/oslo_service/periodic_task.py", line 216, in run_periodic_tasks
      task(self, context)
    File "/tmp/autopkgtest.yxXbpd/build.9dR/src/oslo_service/tests/test_periodic.py", line 54, in crashit
      raise AnException('urg')
  oslo_service.tests.test_periodic.AnException: urg
     ERROR [oslo_service.periodic_task] Error during AService.crashit
  Traceback (most recent call last):
    File "/tmp/autopkgtest.yxXbpd/build.9dR/src/oslo_service/periodic_task.py", line 216, in run_periodic_tasks
      task(self, context)
    File "/tmp/autopkgtest.yxXbpd/build.9dR/src/oslo_service/tests/test_periodic.py", line 54, in crashit
      raise AnException('urg')
  oslo_service.tests.test_periodic.AnException: urg
  {0} oslo_service.tests.test_periodic.PeriodicTasksTestCase.test_called_thrice [0.005251s] ... ok
  {0} oslo_service.tests.test_periodic.PeriodicTasksTestCase.test_name [0.002083s] ... ok
  {0} oslo_service.tests.test_periodic.PeriodicTasksTestCase.test_raises [0.002519s] ... ok
  Exception ignored in: <function _after_fork at 0x7f4da9878790>
  Traceback (most recent call last):
    File "/usr/lib/python3.9/threading.py", line 1486, in _after_fork
      thread._reset_internal_locks(True)
    File "/usr/lib/python3.9/threading.py", line 827, in _reset_internal_locks
      self._started._at_fork_reinit()
    File "/usr/lib/python3.9/threading.py", line 527, in _at_fork_reinit
      self._cond._at_fork_reinit()
    File "/usr/lib/python3.9/threading.py", line 253, in _at_fork_reinit
      self._lock._at_fork_reinit()
  AttributeError: 'Semaphore' object has no attribute '_at_fork_reinit'
  Exception ignored in: <function _after_at_fork_child_reinit_locks at 0x7f4da93150d0>
  Traceback (most recent call last):
    File "/usr/lib/python3.9/logging/__init__.py", line 251, in _after_at_fork_child_reinit_locks
      handler._at_fork_reinit()
    File "/usr/lib/python3.9/logging/__init__.py", line 890, in _at_fork_reinit
      self.lock._at_fork_reinit()
    File "/usr/lib/python3.9/threading.py", line 126, in _at_fork_reinit
      self._block._at_fork_reinit()
  AttributeError: 'Semaphore' object has no attribute '_at_fork_reinit'
  Exception ignored in: <function _after_fork at 0x7f4da8a203a0>
  Traceback (most recent call last):
    File "/usr/lib/python3.9/threading.py", line 1492, in _after_fork
      thread._reset_internal_locks(False)
    File "/usr/lib/python3.9/threading.py", line 827, in _reset_internal_locks
      self._started._at_fork_reinit()
    File "/usr/lib/python3.9/threading.py", line 527, in _at_fork_reinit
      self._cond._at_fork_reinit()
    File "/usr/lib/python3.9/threading.py", line 253, in _at_fork_reinit
      self._lock._at_fork_reinit()

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