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[Bug 1703938] [NEW] AttributeError: 'PortContext' object has no attribute 'session' in l3_hamode_db

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Public bug reported:

Jul 11 20:08:35.720679 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers [None req-13c07cf3-201f-4b86-9e92-8f51bd141c6c admin admin] Mechanism driver 'l2population' failed in delete_port_postcommit: AttributeError: 'PortContext' object has no attribute 'session'
Jul 11 20:08:35.720775 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers Traceback (most recent call last):
Jul 11 20:08:35.720895 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/plugins/ml2/managers.py", line 426, in _call_on_drivers
Jul 11 20:08:35.720971 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     getattr(driver.obj, method_name)(context)
Jul 11 20:08:35.721056 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/plugins/ml2/drivers/l2pop/mech_driver.py", line 79, in delete_port_postcommit
Jul 11 20:08:35.721134 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     context, port['device_owner'], port['device_id']):
Jul 11 20:08:35.721206 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/db/l3_hamode_db.py", line 726, in is_ha_router_port
Jul 11 20:08:35.721283 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     context, router_id=router_id, ha=True)
Jul 11 20:08:35.721369 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/objects/base.py", line 712, in objects_exist
Jul 11 20:08:35.721447 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     context, cls.db_model, **cls.modify_fields_to_db(kwargs))
Jul 11 20:08:35.721526 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/objects/db/api.py", line 32, in get_object
Jul 11 20:08:35.721610 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     return _get_filter_query(context, model, **kwargs).first()
Jul 11 20:08:35.721725 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/objects/db/api.py", line 25, in _get_filter_query
Jul 11 20:08:35.721802 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     with context.session.begin(subtransactions=True):
Jul 11 20:08:35.721877 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers AttributeError: 'PortContext' object has no attribute 'session'
Jul 11 20:08:35.721952 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers 

Example: http://logs.openstack.org/73/304873/44/check/gate-tempest-dsvm-
neutron-dvr-ha-multinode-full-ubuntu-xenial-
nv/586400d/logs/screen-q-svc.txt.gz?level=TRACE#_Jul_11_20_08_35_720679

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: db l3-ha

** Tags added: db l3-ha

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https://bugs.launchpad.net/bugs/1703938

Title:
  AttributeError: 'PortContext' object has no attribute 'session' in
  l3_hamode_db

Status in neutron:
  New

Bug description:
  Jul 11 20:08:35.720679 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers [None req-13c07cf3-201f-4b86-9e92-8f51bd141c6c admin admin] Mechanism driver 'l2population' failed in delete_port_postcommit: AttributeError: 'PortContext' object has no attribute 'session'
  Jul 11 20:08:35.720775 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers Traceback (most recent call last):
  Jul 11 20:08:35.720895 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/plugins/ml2/managers.py", line 426, in _call_on_drivers
  Jul 11 20:08:35.720971 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     getattr(driver.obj, method_name)(context)
  Jul 11 20:08:35.721056 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/plugins/ml2/drivers/l2pop/mech_driver.py", line 79, in delete_port_postcommit
  Jul 11 20:08:35.721134 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     context, port['device_owner'], port['device_id']):
  Jul 11 20:08:35.721206 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/db/l3_hamode_db.py", line 726, in is_ha_router_port
  Jul 11 20:08:35.721283 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     context, router_id=router_id, ha=True)
  Jul 11 20:08:35.721369 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/objects/base.py", line 712, in objects_exist
  Jul 11 20:08:35.721447 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     context, cls.db_model, **cls.modify_fields_to_db(kwargs))
  Jul 11 20:08:35.721526 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/objects/db/api.py", line 32, in get_object
  Jul 11 20:08:35.721610 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     return _get_filter_query(context, model, **kwargs).first()
  Jul 11 20:08:35.721725 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers   File "/opt/stack/new/neutron/neutron/objects/db/api.py", line 25, in _get_filter_query
  Jul 11 20:08:35.721802 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers     with context.session.begin(subtransactions=True):
  Jul 11 20:08:35.721877 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers AttributeError: 'PortContext' object has no attribute 'session'
  Jul 11 20:08:35.721952 ubuntu-xenial-3-node-osic-cloud1-s3500-9770546 neutron-server[27121]: ERROR neutron.plugins.ml2.managers 

  Example: http://logs.openstack.org/73/304873/44/check/gate-tempest-
  dsvm-neutron-dvr-ha-multinode-full-ubuntu-xenial-
  nv/586400d/logs/screen-q-svc.txt.gz?level=TRACE#_Jul_11_20_08_35_720679

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