[New-bugs-announce] [issue38377] test_asyncio.test_events.GetEventLoopTestsMixin.test_get_event_loop_new_process mixin breaks in the Unix environment without working /dev/shm

[Matej Cepl]

New submission from Matej Cepl <mcepl at cepl.eu>:

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ERROR: test_get_event_loop_new_process (test.test_asyncio.test_events.TestCGetEventLoop)
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Traceback (most recent call last):
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/test/test_asyncio/test_events.py", line 2647, in test_get_event_loop_new_process
    self.loop.run_until_complete(main()),
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/asyncio/base_events.py", line 608, in run_until_complete
    return future.result()
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/test/test_asyncio/test_events.py", line 2640, in main
    pool = concurrent.futures.ProcessPoolExecutor()
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/concurrent/futures/process.py", line 555, in __init__
    self._call_queue = _SafeQueue(
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/concurrent/futures/process.py", line 165, in __init__
    super().__init__(max_size, ctx=ctx)
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/multiprocessing/queues.py", line 42, in __init__
    self._rlock = ctx.Lock()
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/multiprocessing/context.py", line 68, in Lock
    return Lock(ctx=self.get_context())
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/multiprocessing/synchronize.py", line 162, in __init__
    SemLock.__init__(self, SEMAPHORE, 1, 1, ctx=ctx)
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/multiprocessing/synchronize.py", line 57, in __init__
    sl = self._semlock = _multiprocessing.SemLock(
OSError: [Errno 38] Function not implemented

======================================================================
ERROR: test_get_event_loop_new_process (test.test_asyncio.test_events.TestPyGetEventLoop)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/test/test_asyncio/test_events.py", line 2647, in test_get_event_loop_new_process
    self.loop.run_until_complete(main()),
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/asyncio/base_events.py", line 608, in run_until_complete
    return future.result()
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/test/test_asyncio/test_events.py", line 2640, in main
    pool = concurrent.futures.ProcessPoolExecutor()
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/concurrent/futures/process.py", line 555, in __init__
    self._call_queue = _SafeQueue(
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/concurrent/futures/process.py", line 165, in __init__
    super().__init__(max_size, ctx=ctx)
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/multiprocessing/queues.py", line 42, in __init__
    self._rlock = ctx.Lock()
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/multiprocessing/context.py", line 68, in Lock
    return Lock(ctx=self.get_context())
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/multiprocessing/synchronize.py", line 162, in __init__
    SemLock.__init__(self, SEMAPHORE, 1, 1, ctx=ctx)
  File "/home/abuild/rpmbuild/BUILD/Python-3.8.0rc1/Lib/multiprocessing/synchronize.py", line 57, in __init__
    sl = self._semlock = _multiprocessing.SemLock(
OSError: [Errno 38] Function not implemented

----------------------------------------------------------------------

The problem is that in the OpenBuildService (the build system of SUSE distributions) /dev/shm is limited to:

abuild at milic:~/rpmbuild/BUILD/Python-3.8.0rc1> ls -ld /dev/shm
drwxr-xr-x 1 root root 0 Oct  5 13:23 /dev/shm
abuild at milic:~/rpmbuild/BUILD/Python-3.8.0rc1>

Provided PR will skip test if /dev/shm doesn’t exist or it doesn’t sufficient permissions.

----------
components: asyncio
messages: 354010
nosy: asvetlov, mcepl, yselivanov
priority: normal
severity: normal
status: open
title: test_asyncio.test_events.GetEventLoopTestsMixin.test_get_event_loop_new_process mixin breaks in the Unix environment without working /dev/shm
versions: Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38377>
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