multiprocessing tests log: UserWarning: resource_tracker: There appear to be 1 leaked shared_memory objects to clean up at shutdown

vstinner

BPO	45209
Nosy	@vstinner, @ambv, @miss-islington, @sobolevn
PRs	bpo-45209: fix `UserWarning: resource_tracker` in test_multiprocessing #28377 [3.10] bpo-45209: fix `UserWarning: resource_tracker` in test_multiprocessing (GH-28377) #28499 [3.9] bpo-45209: fix `UserWarning: resource_tracker` in test_multiprocessing (GH-28377) #28500

^{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 2021-09-21.18:37:39.102>
created_at = <Date 2021-09-15.13:29:13.571>
labels = ['tests', '3.9', '3.10', '3.11']
title = 'multiprocessing tests log: UserWarning: resource_tracker: There appear to be 1 leaked shared_memory objects to clean up at shutdown'
updated_at = <Date 2021-09-21.18:37:39.101>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2021-09-21.18:37:39.101>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2021-09-21.18:37:39.102>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2021-09-15.13:29:13.571>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 45209
keywords = ['patch']
message_count = 7.0
messages = ['401837', '401866', '401902', '402336', '402341', '402342', '402343']
nosy_count = 4.0
nosy_names = ['vstinner', 'lukasz.langa', 'miss-islington', 'sobolevn']
pr_nums = ['28377', '28499', '28500']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue45209'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']