test_multiprocessing_forkserver: test_forkserver_sigkill() fails randomly · Issue #78221 · python/cpython · GitHub

BPO	34040
Nosy	@vstinner, @miss-islington
PRs	bpo-34040, multiprocessing: Fix test_forkserver_sigkill() #8081 [3.7] bpo-34040, multiprocessing: Fix test_forkserver_sigkill() (GH-8081) #8084 [3.6] bpo-34040, multiprocessing: Fix test_forkserver_sigkill() (GH-8081) #8085

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GitHub fields:

assignee = None
closed_at = <Date 2018-07-04.10:35:04.404>
created_at = <Date 2018-07-04.07:49:19.169>
labels = ['3.8', '3.7', 'tests']
title = 'test_multiprocessing_forkserver: test_forkserver_sigkill() fails randomly'
updated_at = <Date 2018-07-04.10:35:04.403>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2018-07-04.10:35:04.403>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2018-07-04.10:35:04.404>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2018-07-04.07:49:19.169>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 34040
keywords = ['patch']
message_count = 7.0
messages = ['321015', '321017', '321024', '321025', '321028', '321030', '321031']
nosy_count = 2.0
nosy_names = ['vstinner', 'miss-islington']
pr_nums = ['8081', '8084', '8085']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue34040'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

AMD64 FreeBSD 10.x Shared 3.x:
http://buildbot.python.org/all/#/builders/87/builds/1137

======================================================================
FAIL: test_forkserver_sigkill (test.test_multiprocessing_forkserver.WithProcessesTestProcess)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10/build/Lib/test/_test_multiprocessing.py", line 680, in test_forkserver_sigkill
    self.check_forkserver_death(signal.SIGKILL)
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10/build/Lib/test/_test_multiprocessing.py", line 670, in check_forkserver_death
    self.assertTrue(evt.is_set())
AssertionError: False is not true

Re-running test 'test_multiprocessing_forkserver' in verbose mode
Ran 310 tests in 100.124s
OK (skipped=27)

Another example of failure:
https://bugs.python.org/issue31687#msg307355

x86 Tiger 3.x:

http://buildbot.python.org/all/#/builders/30/builds/260

======================================================================
FAIL: test_semaphore_tracker (test.test_multiprocessing_forkserver.TestSemaphoreTracker)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/test/_test_multiprocessing.py", line 4380, in test_semaphore_tracker
    _multiprocessing.sem_unlink(name2)
AssertionError: OSError not raised

======================================================================
FAIL: test_forkserver_sigkill (test.test_multiprocessing_forkserver.WithProcessesTestProcess)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/test/_test_multiprocessing.py", line 653, in test_forkserver_sigkill
    self.check_forkserver_death(signal.SIGKILL)
  File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/test/_test_multiprocessing.py", line 643, in check_forkserver_death
    self.assertTrue(evt.is_set())
AssertionError: False is not true

New changeset 07888e1 by Victor Stinner in branch 'master':
bpo-34040, multiprocessing: Fix test_forkserver_sigkill() (GH-8081)
07888e1

Python 2.7 is not affected: it has no forkserver.

New changeset eb700f8 by Miss Islington (bot) in branch '3.7':
bpo-34040, multiprocessing: Fix test_forkserver_sigkill() (GH-8081)
eb700f8

New changeset ae23d8d by Miss Islington (bot) in branch '3.6':
bpo-34040, multiprocessing: Fix test_forkserver_sigkill() (GH-8081)
ae23d8d

I doubled the sleep: it should be better. If not, we can easily increase even more the sleep ;-)

test_multiprocessing_forkserver: test_forkserver_sigkill() fails randomly · Issue #78221 · python/cpython · GitHub

test_multiprocessing_forkserver: test_forkserver_sigkill() fails randomly #78221

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test_multiprocessing_forkserver: test_forkserver_sigkill() fails randomly · Issue #78221 · python/cpython · GitHub

test_multiprocessing_forkserver: test_forkserver_sigkill() fails randomly #78221

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vstinner commented on Jul 4, 2018

vstinner commented on Jul 4, 2018

vstinner commented on Jul 4, 2018

vstinner commented on Jul 4, 2018

miss-islington commented on Jul 4, 2018

miss-islington commented on Jul 4, 2018

vstinner commented on Jul 4, 2018

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