test_multiprocessing_spawn regression on Windows

[pitrou]

BPO	36894
Nosy	@pitrou, @vstinner, @ambv, @pablogsal, @pierreglaser
PRs	bpo-36894: Fix regression in test_multiprocessing_spawn (no tests run on Windows) #13290

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-06-05.08:24:31.808>
created_at = <Date 2019-05-12.17:03:41.689>
labels = ['tests', '3.8', 'type-bug', 'library', 'deferred-blocker']
title = 'test_multiprocessing_spawn regression on Windows'
updated_at = <Date 2019-06-05.08:24:31.802>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2019-06-05.08:24:31.802>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-06-05.08:24:31.808>
closer = 'vstinner'
components = ['Library (Lib)', 'Tests']
creation = <Date 2019-05-12.17:03:41.689>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 36894
keywords = ['patch']
message_count = 6.0
messages = ['342262', '342270', '342368', '342371', '344609', '344682']
nosy_count = 5.0
nosy_names = ['pitrou', 'vstinner', 'lukasz.langa', 'pablogsal', 'pierreglaser']
pr_nums = ['13290']
priority = 'deferred blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36894'
versions = ['Python 3.8']

[pitrou]

After bpo-36867, test_multiprocessing_spawn fails running any test on Windows (but it isn't noticed as a fail build).

https://ci.appveyor.com/project/python/cpython/builds/24485897#L1264

0:04:05 load avg: 5.39 [389/421] test_multiprocessing_spawn run no tests
ERROR
======================================================================
ERROR: setUpModule (test.test_multiprocessing_spawn)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "C:\projects\cpython\lib\test\_test_multiprocessing.py", line 5498, in setUpModule
    multiprocessing.set_forkserver_preload(PRELOAD)
  File "C:\projects\cpython\lib\multiprocessing\context.py", line 183, in set_forkserver_preload
    from .forkserver import set_forkserver_preload
  File "C:\projects\cpython\lib\multiprocessing\forkserver.py", line 14, in <module>
    from . import resource_tracker
  File "C:\projects\cpython\lib\multiprocessing\resource_tracker.py", line 24, in <module>
    import _posixshmem
ModuleNotFoundError: No module named '_posixshmem'

---

Ran 0 tests in 0.005s
FAILED (errors=1)

[pablogsal]

Indeed, this is failing as well in all buildbots but has not been reported because fails in the setUp and therefore is counted as "RUN NO TESTS". Example:

https://buildbot.python.org/all/#/builders/58/builds/2368/steps/3/logs/stdio

[pierreglaser]

Thanks for the fix Antoine.

[pitrou]

New changeset 95da83d by Antoine Pitrou in branch 'master':
bpo-36894: Fix regression in test_multiprocessing_spawn (no tests run on Windows) (GH-13290)
95da83d

[ambv]

Can this be closed?

[vstinner]

I close the issue.