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[Bug 1551925] [NEW] NotImplementedError: Cannot load 'serial_listen_addr' in the base class

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Public bug reported:

This is seen in unit test runs:

http://logs.openstack.org/59/284959/5/gate/gate-nova-
python27/8ab5da7/console.html

2016-03-01 14:54:26.205 | {1} nova.tests.unit.virt.test_virt_drivers.LibvirtConnTestCase.test_live_migration [0.190245s] ... ok
2016-03-01 14:54:26.205 | 
2016-03-01 14:54:26.205 | Captured stderr:
2016-03-01 14:54:26.206 | ~~~~~~~~~~~~~~~~
2016-03-01 14:54:26.206 |     Traceback (most recent call last):
2016-03-01 14:54:26.206 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 457, in fire_timers
2016-03-01 14:54:26.206 |         timer()
2016-03-01 14:54:26.206 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/eventlet/hubs/timer.py", line 58, in __call__
2016-03-01 14:54:26.206 |         cb(*args, **kw)
2016-03-01 14:54:26.206 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/eventlet/greenthread.py", line 214, in main
2016-03-01 14:54:26.206 |         result = function(*args, **kwargs)
2016-03-01 14:54:26.206 |       File "nova/utils.py", line 1160, in context_wrapper
2016-03-01 14:54:26.206 |         return func(*args, **kwargs)
2016-03-01 14:54:26.206 |       File "nova/virt/libvirt/driver.py", line 6088, in _live_migration_operation
2016-03-01 14:54:26.207 |         instance=instance)
2016-03-01 14:54:26.207 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2016-03-01 14:54:26.207 |         self.force_reraise()
2016-03-01 14:54:26.207 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2016-03-01 14:54:26.207 |         six.reraise(self.type_, self.value, self.tb)
2016-03-01 14:54:26.207 |       File "nova/virt/libvirt/driver.py", line 6014, in _live_migration_operation
2016-03-01 14:54:26.207 |         serial_listen_addr = migrate_data.serial_listen_addr
2016-03-01 14:54:26.207 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 67, in getter
2016-03-01 14:54:26.207 |         self.obj_load_attr(name)
2016-03-01 14:54:26.207 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 580, in obj_load_attr
2016-03-01 14:54:26.207 |         _("Cannot load '%s' in the base class") % attrname)
2016-03-01 14:54:26.207 |     NotImplementedError: Cannot load 'serial_listen_addr' in the base class
2016-03-01 14:54:26.208 |     

The error is squashed since the
nova.tests.unit.virt.test_virt_drivers._VirtDriverTestCase that defines
the test ignores NotImplementedError:

https://github.com/openstack/nova/blob/9ab6840af64d6af58baf51040afe86a3324221e5/nova/tests/unit/virt/test_virt_drivers.py#L659

The code is unconditionally loading the attribute:

https://github.com/openstack/nova/blob/1345d0fe1cad5093d49a58b6f0b7f4cb650f61d8/nova/virt/libvirt/driver.py#L5946

But the attribute is optional:

https://github.com/openstack/nova/blob/1345d0fe1cad5093d49a58b6f0b7f4cb650f61d8/nova/objects/migrate_data.py#L124

** Affects: nova
     Importance: Medium
     Assignee: Matt Riedemann (mriedem)
         Status: Triaged


** Tags: libvirt live-migration unified-objects

** Changed in: nova
     Assignee: (unassigned) => Matt Riedemann (mriedem)

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https://bugs.launchpad.net/bugs/1551925

Title:
  NotImplementedError: Cannot load 'serial_listen_addr' in the base
  class

Status in OpenStack Compute (nova):
  Triaged

Bug description:
  This is seen in unit test runs:

  http://logs.openstack.org/59/284959/5/gate/gate-nova-
  python27/8ab5da7/console.html

  2016-03-01 14:54:26.205 | {1} nova.tests.unit.virt.test_virt_drivers.LibvirtConnTestCase.test_live_migration [0.190245s] ... ok
  2016-03-01 14:54:26.205 | 
  2016-03-01 14:54:26.205 | Captured stderr:
  2016-03-01 14:54:26.206 | ~~~~~~~~~~~~~~~~
  2016-03-01 14:54:26.206 |     Traceback (most recent call last):
  2016-03-01 14:54:26.206 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 457, in fire_timers
  2016-03-01 14:54:26.206 |         timer()
  2016-03-01 14:54:26.206 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/eventlet/hubs/timer.py", line 58, in __call__
  2016-03-01 14:54:26.206 |         cb(*args, **kw)
  2016-03-01 14:54:26.206 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/eventlet/greenthread.py", line 214, in main
  2016-03-01 14:54:26.206 |         result = function(*args, **kwargs)
  2016-03-01 14:54:26.206 |       File "nova/utils.py", line 1160, in context_wrapper
  2016-03-01 14:54:26.206 |         return func(*args, **kwargs)
  2016-03-01 14:54:26.206 |       File "nova/virt/libvirt/driver.py", line 6088, in _live_migration_operation
  2016-03-01 14:54:26.207 |         instance=instance)
  2016-03-01 14:54:26.207 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2016-03-01 14:54:26.207 |         self.force_reraise()
  2016-03-01 14:54:26.207 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2016-03-01 14:54:26.207 |         six.reraise(self.type_, self.value, self.tb)
  2016-03-01 14:54:26.207 |       File "nova/virt/libvirt/driver.py", line 6014, in _live_migration_operation
  2016-03-01 14:54:26.207 |         serial_listen_addr = migrate_data.serial_listen_addr
  2016-03-01 14:54:26.207 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 67, in getter
  2016-03-01 14:54:26.207 |         self.obj_load_attr(name)
  2016-03-01 14:54:26.207 |       File "/home/jenkins/workspace/gate-nova-python27/.tox/py27/local/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 580, in obj_load_attr
  2016-03-01 14:54:26.207 |         _("Cannot load '%s' in the base class") % attrname)
  2016-03-01 14:54:26.207 |     NotImplementedError: Cannot load 'serial_listen_addr' in the base class
  2016-03-01 14:54:26.208 |     

  The error is squashed since the
  nova.tests.unit.virt.test_virt_drivers._VirtDriverTestCase that
  defines the test ignores NotImplementedError:

  https://github.com/openstack/nova/blob/9ab6840af64d6af58baf51040afe86a3324221e5/nova/tests/unit/virt/test_virt_drivers.py#L659

  The code is unconditionally loading the attribute:

  https://github.com/openstack/nova/blob/1345d0fe1cad5093d49a58b6f0b7f4cb650f61d8/nova/virt/libvirt/driver.py#L5946

  But the attribute is optional:

  https://github.com/openstack/nova/blob/1345d0fe1cad5093d49a58b6f0b7f4cb650f61d8/nova/objects/migrate_data.py#L124

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