test_multiprocessing_spawn randomly hangs AMD64 FreeBSD 10.x Shared 3.x

[vstinner]

BPO	31376
Nosy	@vstinner
Superseder	bpo-31180: test_multiprocessing_spawn hangs randomly

^{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 2017-09-21.11:21:42.516>
created_at = <Date 2017-09-06.23:32:15.879>
labels = ['3.7', 'library']
title = 'test_multiprocessing_spawn randomly hangs AMD64 FreeBSD 10.x Shared 3.x'
updated_at = <Date 2017-09-21.11:21:42.515>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2017-09-21.11:21:42.515>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2017-09-21.11:21:42.516>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2017-09-06.23:32:15.879>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 31376
keywords = []
message_count = 2.0
messages = ['301544', '302275']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '31180'
type = None
url = 'https://bugs.python.org/issue31376'
versions = ['Python 3.7']

[vstinner]

http://buildbot.python.org/all/builders/AMD64%20FreeBSD%2010.x%20Shared%203.x/builds/818/steps/test/logs/stdio

0:08:27 load avg: 2.79 [403/407] test_strtod passed -- running: test_multiprocessing_spawn (244 sec)
0:08:27 load avg: 2.79 [404/407] test_syslog passed -- running: test_multiprocessing_spawn (244 sec)
0:08:28 load avg: 2.79 [405/407] test_pickle passed -- running: test_multiprocessing_spawn (246 sec)
0:08:52 load avg: 1.99 [406/407] test_io passed (49 sec) -- running: test_multiprocessing_spawn (269 sec)

command timed out: 1200 seconds without output running ['make', 'buildbottest', 'TESTOPTS=-j2 -j4', 'TESTPYTHONOPTS=', 'TESTTIMEOUT=900'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1733.500843

[vstinner]

I merged this issue with bpo-31180.