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Transient error in multiprocessing (test_number_of_objects) #50180

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pitrou opened this issue May 4, 2009 · 8 comments
Closed

Transient error in multiprocessing (test_number_of_objects) #50180

pitrou opened this issue May 4, 2009 · 8 comments
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stdlib Python modules in the Lib dir tests Tests in the Lib/test dir type-bug An unexpected behavior, bug, or error

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@pitrou
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pitrou commented May 4, 2009

BPO 5930
Nosy @pitrou, @vstinner, @florentx

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 2014-06-27.20:05:55.046>
created_at = <Date 2009-05-04.21:33:23.556>
labels = ['tests', 'type-bug', 'library']
title = 'Transient error in multiprocessing (test_number_of_objects)'
updated_at = <Date 2014-06-27.20:05:55.045>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2014-06-27.20:05:55.045>
actor = 'vstinner'
assignee = 'jnoller'
closed = True
closed_date = <Date 2014-06-27.20:05:55.046>
closer = 'vstinner'
components = ['Library (Lib)', 'Tests']
creation = <Date 2009-05-04.21:33:23.556>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 5930
keywords = ['buildbot']
message_count = 8.0
messages = ['87182', '87183', '99101', '99582', '100405', '113329', '113905', '221705']
nosy_count = 6.0
nosy_names = ['pitrou', 'vstinner', 'jnoller', 'asksol', 'flox', 'BreamoreBoy']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'test needed'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue5930'
versions = ['Python 3.4', 'Python 3.5']
@pitrou
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pitrou commented May 4, 2009

Just got this on py3k, I can't reproduce unfortunately.

test test_multiprocessing failed -- Traceback (most recent call last):
  File "/home/antoine/py3k/__svn__/Lib/test/test_multiprocessing.py",
line 1070, in test_number_of_objects
    self.assertEqual(refs, EXPECTED_NUMBER)
AssertionError: 10 != 1

@pitrou pitrou added stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error labels May 4, 2009
@jnoller
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jnoller mannequin commented May 4, 2009

there's not much I can do without the ability to reproduce it :(

@florentx florentx mannequin added the tests Tests in the Lib/test dir label Feb 8, 2010
@florentx
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florentx mannequin commented Feb 9, 2010

Closed duplicate reports bpo-6366 and bpo-6747.

@florentx
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florentx mannequin commented Feb 19, 2010

Again, but with more details:
http://www.python.org/dev/buildbot/all/builders/i386%20Ubuntu%203.1/builds/302

test_multiprocessing
Process Process-49:
Traceback (most recent call last):
  File "/scratch/pybot-buildarea/3.1.klose-ubuntu-i386/build/Lib/multiprocessing/process.py", line 233, in _bootstrap
    self.run()
  File "/scratch/pybot-buildarea/3.1.klose-ubuntu-i386/build/Lib/multiprocessing/process.py", line 88, in run
    self._target(*self._args, **self._kwargs)
  File "/scratch/pybot-buildarea/3.1.klose-ubuntu-i386/build/Lib/test/test_multiprocessing.py", line 616, in f
    woken.release()
  File "/scratch/pybot-buildarea/3.1.klose-ubuntu-i386/build/Lib/multiprocessing/managers.py", line 962, in release
    return self._callmethod('release')
  File "/scratch/pybot-buildarea/3.1.klose-ubuntu-i386/build/Lib/multiprocessing/managers.py", line 750, in _callmethod
    raise convert_to_error(kind, result)
multiprocessing.managers.RemoteError: 
---------------------------------------------------------------------------
Traceback (most recent call last):
  File "/scratch/pybot-buildarea/3.1.klose-ubuntu-i386/build/Lib/multiprocessing/managers.py", line 219, in serve_client
    obj, exposed, gettypeid = id_to_obj[ident]
KeyError: 'cc9dc3c'
---------------------------------------------------------------------------
test test_multiprocessing failed -- Traceback (most recent call last):
  File "/scratch/pybot-buildarea/3.1.klose-ubuntu-i386/build/Lib/test/test_multiprocessing.py", line 1077, in test_number_of_objects
    self.assertEqual(refs, EXPECTED_NUMBER)
AssertionError: 9 != 1

@florentx
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florentx mannequin commented Mar 4, 2010

It might be related to bpo-7805. Let see if it happens again.

@vstinner vstinner changed the title Transient error in multiprocessing Transient error in multiprocessing (test_number_of_objects) Apr 18, 2010
@florentx
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florentx mannequin commented Aug 8, 2010

Confirmed on some buildbots.

@florentx
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florentx mannequin commented Aug 14, 2010

It happens on some 3.1 buildbots:

(...)
test_number_of_objects (test.test_multiprocessing.WithManagerTestZZZNumberOfObjects) ...
2c44bbe0: refcount=1
<_thread.lock object at 0x2c44bbe0>
2c56030c: refcount=2
<multiprocessing.pool.Pool object at 0x2c56030c>
2cf51a0c: refcount=1
<_RLock owner=None count=0>
2e3b81b4: refcount=1
<generator object <genexpr> at 0x2e3b81b4>
2e466e34: refcount=1
<multiprocessing.pool.ApplyResult object at 0x2e466e34>
2e5a506c: refcount=1
<multiprocessing.pool.IMapIterator object at 0x2e5a506c>
2c44bbe0: refcount=1
<_thread.lock object at 0x2c44bbe0>
2c56030c: refcount=2
<multiprocessing.pool.Pool object at 0x2c56030c>
2cf51a0c: refcount=1
<_RLock owner=None count=0>
2e3b81b4: refcount=1
<generator object <genexpr> at 0x2e3b81b4>
2e466e34: refcount=1
<multiprocessing.pool.ApplyResult object at 0x2e466e34>
2e5a506c: refcount=1
<multiprocessing.pool.IMapIterator object at 0x2e5a506c>
FAIL

(...)
======================================================================
FAIL: test_number_of_objects (test.test_multiprocessing.WithManagerTestZZZNumberOfObjects)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/usr/home/db3l/buildarea/3.1.bolen-freebsd7/build/Lib/test/test_multiprocessing.py", line 1085, in test_number_of_objects
    self.assertEqual(refs, EXPECTED_NUMBER)
AssertionError: 6 != 1

@BreamoreBoy
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BreamoreBoy mannequin commented Jun 27, 2014

Can this be closed as "out of date"?

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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