GeezerVison

    def tearDown(self):
        super().tearDown()  # shutdown executor
        if self.mp_context and self.mp_context.get_start_method() in ("spawn", "forkserver"):
            # Stop resource tracker manually now, so we can verify there are
            # not leaked resources by checking the process exit code
            from multiprocessing.resource_tracker import _resource_tracker
            _resource_tracker._stop()
            self.assertEqual(_resource_tracker._exitcode, 0)

$ ./python -m unittest test.test_concurrent_futures.ProcessPoolForkserverFailingInitializerTest -v
test_initializer (test.test_concurrent_futures.ProcessPoolForkserverFailingInitializerTest.test_initializer) ... /home/user/cpython/Lib/multiprocessing/resource_tracker.py:236: UserWarning: resource_tracker: There appear to be 3 leaked semaphore objects to clean up at shutdown
  warnings.warn('resource_tracker: There appear to be %d '
FAIL
Traceback (most recent call last):
  File "/home/user/cpython/Lib/multiprocessing/util.py", line 300, in _run_finalizers
    finalizer()
  File "/home/user/cpython/Lib/multiprocessing/util.py", line 224, in __call__
    res = self._callback(*self._args, **self._kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/cpython/Lib/multiprocessing/synchronize.py", line 87, in _cleanup
    sem_unlink(name)
FileNotFoundError: [Errno 2] No such file or directory
Traceback (most recent call last):
  File "/home/user/cpython/Lib/multiprocessing/util.py", line 300, in _run_finalizers
    finalizer()
  File "/home/user/cpython/Lib/multiprocessing/util.py", line 224, in __call__
    res = self._callback(*self._args, **self._kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/cpython/Lib/multiprocessing/synchronize.py", line 87, in _cleanup
    sem_unlink(name)
FileNotFoundError: [Errno 2] No such file or directory
Traceback (most recent call last):
  File "/home/user/cpython/Lib/multiprocessing/util.py", line 300, in _run_finalizers
    finalizer()
  File "/home/user/cpython/Lib/multiprocessing/util.py", line 224, in __call__
    res = self._callback(*self._args, **self._kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/cpython/Lib/multiprocessing/synchronize.py", line 87, in _cleanup
    sem_unlink(name)
FileNotFoundError: [Errno 2] No such file or directory

======================================================================
FAIL: test_initializer (test.test_concurrent_futures.ProcessPoolForkserverFailingInitializerTest.test_initializer)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/user/cpython/Lib/test/test_concurrent_futures.py", line 298, in tearDown
    self.assertEqual(_resource_tracker._exitcode, 0)
AssertionError: 1 != 0

----------------------------------------------------------------------
Ran 1 test in 0.269s

FAILED (failures=1)