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[Bug 1906381] [NEW] [L2] current binding port get type errors

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Public bug reported:

get_binding_levels can return None if the binding host is None. But the
patch [1] did not handle such case. The code will raise a TypeError.

[1] https://review.opendev.org/c/openstack/neutron/+/606827


Bug was first found in stable/rocky, but the master branch has same code.

ERROR logs:
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 142, in wrapper
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     return f(*args, **kwargs)
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/neutron_lib/db/api.py", line 183, in wrapped
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     LOG.debug("Retry wrapper got retriable exception: %s", e)
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     self.force_reraise()
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/neutron_lib/db/api.py", line 179, in wrapped
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     return f(*dup_args, **dup_kwargs)
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 491, in _bind_port_if_needed
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     need_notify, try_again))
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 679, in _commit_port_binding
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     for level in levels:
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server TypeError: 'NoneType' object is not iterable
2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server

** Affects: neutron
     Importance: Low
     Assignee: LIU Yulong (dragon889)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1906381

Title:
  [L2] current binding port get type errors

Status in neutron:
  In Progress

Bug description:
  get_binding_levels can return None if the binding host is None. But
  the patch [1] did not handle such case. The code will raise a
  TypeError.

  [1] https://review.opendev.org/c/openstack/neutron/+/606827

  
  Bug was first found in stable/rocky, but the master branch has same code.

  ERROR logs:
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 142, in wrapper
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     return f(*args, **kwargs)
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/neutron_lib/db/api.py", line 183, in wrapped
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     LOG.debug("Retry wrapper got retriable exception: %s", e)
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     self.force_reraise()
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/neutron_lib/db/api.py", line 179, in wrapped
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     return f(*dup_args, **dup_kwargs)
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 491, in _bind_port_if_needed
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     need_notify, try_again))
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/plugin.py", line 679, in _commit_port_binding
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server     for level in levels:
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server TypeError: 'NoneType' object is not iterable
  2020-11-30 16:46:55.942 62088 ERROR oslo_messaging.rpc.server

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