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[Bug 1770452] [NEW] neutron.tests.unit.objects.test_subnet.SubnetDbObjectTestCase.test_db_obj failing with <NetworkSegment at 0x7fdf760a7310> is not bound to a Session

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Miguel Lavalle <miguel@xxxxxxxxxxxx>
Date: Thu, 10 May 2018 16:45:29 -0000
Reply-to: Bug 1770452 <1770452@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

Today I found the same failure in two unrelated patches:

http://logs.openstack.org/61/567461/1/check/openstack-tox-py27/1bbd80a
/job-output.txt.gz#_2018-05-10_03_52_48_299412

http://logs.openstack.org/73/566673/2/gate/openstack-tox-cover/a8914e0
/job-output.txt.gz#_2018-05-10_12_42_13_309505

The traceback looks as follows:

2018-05-10 12:42:13.309505 | ubuntu-xenial | FAIL: neutron.tests.unit.objects.test_subnet.SubnetDbObjectTestCase.test_db_obj
2018-05-10 12:42:13.309555 | ubuntu-xenial | tags: worker-1
2018-05-10 12:42:13.309605 | ubuntu-xenial | ----------------------------------------------------------------------
2018-05-10 12:42:13.309632 | ubuntu-xenial | Traceback (most recent call last):
2018-05-10 12:42:13.309666 | ubuntu-xenial |   File "neutron/tests/base.py", line 140, in func
2018-05-10 12:42:13.309692 | ubuntu-xenial |     return f(self, *args, **kwargs)
2018-05-10 12:42:13.309739 | ubuntu-xenial |   File "neutron/tests/unit/objects/test_base.py", line 2017, in test_db_obj
2018-05-10 12:42:13.309768 | ubuntu-xenial |     old_model = copy.deepcopy(obj.db_obj)
2018-05-10 12:42:13.309806 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 190, in deepcopy
2018-05-10 12:42:13.309833 | ubuntu-xenial |     y = _reconstruct(x, rv, 1, memo)
2018-05-10 12:42:13.309897 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 334, in _reconstruct
2018-05-10 12:42:13.309928 | ubuntu-xenial |     state = deepcopy(state, memo)
2018-05-10 12:42:13.309967 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 163, in deepcopy
2018-05-10 12:42:13.310010 | ubuntu-xenial |     y = copier(x, memo)
2018-05-10 12:42:13.310066 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 257, in _deepcopy_dict
2018-05-10 12:42:13.310141 | ubuntu-xenial |     y[deepcopy(key, memo)] = deepcopy(value, memo)
2018-05-10 12:42:13.310187 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 190, in deepcopy
2018-05-10 12:42:13.310214 | ubuntu-xenial |     y = _reconstruct(x, rv, 1, memo)
2018-05-10 12:42:13.310255 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 334, in _reconstruct
2018-05-10 12:42:13.310280 | ubuntu-xenial |     state = deepcopy(state, memo)
2018-05-10 12:42:13.310318 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 163, in deepcopy
2018-05-10 12:42:13.310338 | ubuntu-xenial |     y = copier(x, memo)
2018-05-10 12:42:13.310380 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 257, in _deepcopy_dict
2018-05-10 12:42:13.310414 | ubuntu-xenial |     y[deepcopy(key, memo)] = deepcopy(value, memo)
2018-05-10 12:42:13.310452 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 190, in deepcopy
2018-05-10 12:42:13.310479 | ubuntu-xenial |     y = _reconstruct(x, rv, 1, memo)
2018-05-10 12:42:13.310519 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 352, in _reconstruct
2018-05-10 12:42:13.310538 | ubuntu-xenial |     y.append(item)
2018-05-10 12:50:00.920204 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/collections.py", line 1044, in append
2018-05-10 12:50:00.920385 | ubuntu-xenial |     item = __set(self, item, _sa_initiator)
2018-05-10 12:50:00.920620 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/collections.py", line 1016, in __set
2018-05-10 12:50:00.920754 | ubuntu-xenial |     item = executor.fire_append_event(item, _sa_initiator)
2018-05-10 12:50:00.920975 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/collections.py", line 680, in fire_append_event
2018-05-10 12:50:00.921021 | ubuntu-xenial |     item, initiator)
2018-05-10 12:50:00.921251 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 943, in fire_append_event
2018-05-10 12:50:00.921335 | ubuntu-xenial |     state, value, initiator or self._append_token)
2018-05-10 12:50:00.921566 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 1228, in emit_backref_from_collection_append_event
2018-05-10 12:50:00.921628 | ubuntu-xenial |     passive=PASSIVE_NO_FETCH)
2018-05-10 12:50:00.921845 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 624, in append
2018-05-10 12:50:00.921964 | ubuntu-xenial |     self.set(state, dict_, value, initiator, passive=passive)
2018-05-10 12:50:00.922173 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 798, in set
2018-05-10 12:50:00.922227 | ubuntu-xenial |     LOAD_AGAINST_COMMITTED)
2018-05-10 12:50:00.922414 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 599, in get
2018-05-10 12:50:00.922479 | ubuntu-xenial |     value = self.callable_(state, passive)
2018-05-10 12:50:00.922680 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/strategies.py", line 596, in _load_for_state
2018-05-10 12:50:00.922743 | ubuntu-xenial |     (orm_util.state_str(state), self.key)
2018-05-10 12:50:00.923061 | ubuntu-xenial | sqlalchemy.orm.exc.DetachedInstanceError: Parent instance <NetworkSegment at 0x7fdf760a7310> is not bound to a Session; lazy load operation of attribute 'network' cannot proceed (Background on this error at: http://sqlalche.me/e/bhk3)

** Affects: neutron
     Importance: Low
         Status: New

** Changed in: neutron
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/1770452

Title:
  neutron.tests.unit.objects.test_subnet.SubnetDbObjectTestCase.test_db_obj
  failing with  <NetworkSegment at 0x7fdf760a7310> is not bound to a
  Session

Status in neutron:
  New

Bug description:
  Today I found the same failure in two unrelated patches:

  http://logs.openstack.org/61/567461/1/check/openstack-tox-py27/1bbd80a
  /job-output.txt.gz#_2018-05-10_03_52_48_299412

  http://logs.openstack.org/73/566673/2/gate/openstack-tox-cover/a8914e0
  /job-output.txt.gz#_2018-05-10_12_42_13_309505

  The traceback looks as follows:

  2018-05-10 12:42:13.309505 | ubuntu-xenial | FAIL: neutron.tests.unit.objects.test_subnet.SubnetDbObjectTestCase.test_db_obj
  2018-05-10 12:42:13.309555 | ubuntu-xenial | tags: worker-1
  2018-05-10 12:42:13.309605 | ubuntu-xenial | ----------------------------------------------------------------------
  2018-05-10 12:42:13.309632 | ubuntu-xenial | Traceback (most recent call last):
  2018-05-10 12:42:13.309666 | ubuntu-xenial |   File "neutron/tests/base.py", line 140, in func
  2018-05-10 12:42:13.309692 | ubuntu-xenial |     return f(self, *args, **kwargs)
  2018-05-10 12:42:13.309739 | ubuntu-xenial |   File "neutron/tests/unit/objects/test_base.py", line 2017, in test_db_obj
  2018-05-10 12:42:13.309768 | ubuntu-xenial |     old_model = copy.deepcopy(obj.db_obj)
  2018-05-10 12:42:13.309806 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 190, in deepcopy
  2018-05-10 12:42:13.309833 | ubuntu-xenial |     y = _reconstruct(x, rv, 1, memo)
  2018-05-10 12:42:13.309897 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 334, in _reconstruct
  2018-05-10 12:42:13.309928 | ubuntu-xenial |     state = deepcopy(state, memo)
  2018-05-10 12:42:13.309967 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 163, in deepcopy
  2018-05-10 12:42:13.310010 | ubuntu-xenial |     y = copier(x, memo)
  2018-05-10 12:42:13.310066 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 257, in _deepcopy_dict
  2018-05-10 12:42:13.310141 | ubuntu-xenial |     y[deepcopy(key, memo)] = deepcopy(value, memo)
  2018-05-10 12:42:13.310187 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 190, in deepcopy
  2018-05-10 12:42:13.310214 | ubuntu-xenial |     y = _reconstruct(x, rv, 1, memo)
  2018-05-10 12:42:13.310255 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 334, in _reconstruct
  2018-05-10 12:42:13.310280 | ubuntu-xenial |     state = deepcopy(state, memo)
  2018-05-10 12:42:13.310318 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 163, in deepcopy
  2018-05-10 12:42:13.310338 | ubuntu-xenial |     y = copier(x, memo)
  2018-05-10 12:42:13.310380 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 257, in _deepcopy_dict
  2018-05-10 12:42:13.310414 | ubuntu-xenial |     y[deepcopy(key, memo)] = deepcopy(value, memo)
  2018-05-10 12:42:13.310452 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 190, in deepcopy
  2018-05-10 12:42:13.310479 | ubuntu-xenial |     y = _reconstruct(x, rv, 1, memo)
  2018-05-10 12:42:13.310519 | ubuntu-xenial |   File "/usr/lib/python2.7/copy.py", line 352, in _reconstruct
  2018-05-10 12:42:13.310538 | ubuntu-xenial |     y.append(item)
  2018-05-10 12:50:00.920204 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/collections.py", line 1044, in append
  2018-05-10 12:50:00.920385 | ubuntu-xenial |     item = __set(self, item, _sa_initiator)
  2018-05-10 12:50:00.920620 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/collections.py", line 1016, in __set
  2018-05-10 12:50:00.920754 | ubuntu-xenial |     item = executor.fire_append_event(item, _sa_initiator)
  2018-05-10 12:50:00.920975 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/collections.py", line 680, in fire_append_event
  2018-05-10 12:50:00.921021 | ubuntu-xenial |     item, initiator)
  2018-05-10 12:50:00.921251 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 943, in fire_append_event
  2018-05-10 12:50:00.921335 | ubuntu-xenial |     state, value, initiator or self._append_token)
  2018-05-10 12:50:00.921566 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 1228, in emit_backref_from_collection_append_event
  2018-05-10 12:50:00.921628 | ubuntu-xenial |     passive=PASSIVE_NO_FETCH)
  2018-05-10 12:50:00.921845 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 624, in append
  2018-05-10 12:50:00.921964 | ubuntu-xenial |     self.set(state, dict_, value, initiator, passive=passive)
  2018-05-10 12:50:00.922173 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 798, in set
  2018-05-10 12:50:00.922227 | ubuntu-xenial |     LOAD_AGAINST_COMMITTED)
  2018-05-10 12:50:00.922414 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py", line 599, in get
  2018-05-10 12:50:00.922479 | ubuntu-xenial |     value = self.callable_(state, passive)
  2018-05-10 12:50:00.922680 | ubuntu-xenial |   File "/home/zuul/src/git.openstack.org/openstack/neutron/.tox/cover/local/lib/python2.7/site-packages/sqlalchemy/orm/strategies.py", line 596, in _load_for_state
  2018-05-10 12:50:00.922743 | ubuntu-xenial |     (orm_util.state_str(state), self.key)
  2018-05-10 12:50:00.923061 | ubuntu-xenial | sqlalchemy.orm.exc.DetachedInstanceError: Parent instance <NetworkSegment at 0x7fdf760a7310> is not bound to a Session; lazy load operation of attribute 'network' cannot proceed (Background on this error at: http://sqlalche.me/e/bhk3)

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Follow ups

[Bug 1770452] Re: neutron.tests.unit.objects.test_subnet.SubnetDbObjectTestCase.test_db_obj failing with <NetworkSegment at 0x7fdf760a7310> is not bound to a Session
From: OpenStack Infra, 2018-05-16