Public bug reported:
The linux bridge agent is picking up too many false positives in its
detection mechanism for when devices have been modified locally. In the
following the 4 tap devices attached to a particular bridge had
timestamps that jumped forward even though none of the interfaces
actually changed:
2016-09-13 00:13:38.744 14179 DEBUG
neutron.plugins.ml2.drivers.agent._common_agent
[req-82c02245-80fd-4712-baa6-cdd4033315d1 - -] Adding locally changed devices
to updated set: set(['tap422b85d9-95', 'tap9b365584-34', 'tapee2684f8-51',
'tap66ef2d8e-3b']) scan_devices
/opt/stack/new/neutron/neutron/plugins/ml2/drivers/agent/_common_agent.py:397
2016-09-13 00:13:38.744 14179 DEBUG
neutron.plugins.ml2.drivers.agent._common_agent
[req-82c02245-80fd-4712-baa6-cdd4033315d1 - -] Agent loop found changes!
{'current': set(['tap422b85d9-95', 'tapee2684f8-51', 'tap6028e7a2-c0',
'tap9b365584-34', 'tap0960ffac-f9', 'tap7ba5f865-54', 'tap66ef2d8e-3b',
'tapfe427ba3-63', 'tap475f33ef-c3']), 'timestamps': {'tap422b85d9-95':
1473725618.73996, 'tapee2684f8-51': 1473725618.73996, 'tap6028e7a2-c0': None,
'tap9b365584-34': 1473725618.73996, 'tap0960ffac-f9': 1473725618.73996,
'tap7ba5f865-54': 1473725616.7399597, 'tap66ef2d8e-3b': 1473725618.73996,
'tapfe427ba3-63': 1473725616.7399597, 'tap475f33ef-c3': None}, 'removed':
set([]), 'added': set([]), 'updated': set(['tap422b85d9-95', 'tap9b365584-34',
'tapee2684f8-51', 'tap66ef2d8e-3b'])} daemon_loop
/opt/stack/new/neutron/neutron/plugins/ml2/drivers/agent/_common_agent.py:448
This leads to the agent refetching the details, which puts the port in BUILD
and then back to ACTIVE. This leads to sporadic failures when tempest tests are
asserting that a port should be in the ACTIVE status.
** Affects: neutron
Importance: Undecided
Assignee: Kevin Benton (kevinbenton)
Status: New
** Changed in: neutron
Assignee: (unassigned) => Kevin Benton (kevinbenton)
** Changed in: neutron
Milestone: None => newton-rc1
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https://bugs.launchpad.net/bugs/1622833
Title:
timestamp mechanism in linux bridge false positives
Status in neutron:
New
Bug description:
The linux bridge agent is picking up too many false positives in its
detection mechanism for when devices have been modified locally. In
the following the 4 tap devices attached to a particular bridge had
timestamps that jumped forward even though none of the interfaces
actually changed:
2016-09-13 00:13:38.744 14179 DEBUG
neutron.plugins.ml2.drivers.agent._common_agent
[req-82c02245-80fd-4712-baa6-cdd4033315d1 - -] Adding locally changed devices
to updated set: set(['tap422b85d9-95', 'tap9b365584-34', 'tapee2684f8-51',
'tap66ef2d8e-3b']) scan_devices
/opt/stack/new/neutron/neutron/plugins/ml2/drivers/agent/_common_agent.py:397
2016-09-13 00:13:38.744 14179 DEBUG
neutron.plugins.ml2.drivers.agent._common_agent
[req-82c02245-80fd-4712-baa6-cdd4033315d1 - -] Agent loop found changes!
{'current': set(['tap422b85d9-95', 'tapee2684f8-51', 'tap6028e7a2-c0',
'tap9b365584-34', 'tap0960ffac-f9', 'tap7ba5f865-54', 'tap66ef2d8e-3b',
'tapfe427ba3-63', 'tap475f33ef-c3']), 'timestamps': {'tap422b85d9-95':
1473725618.73996, 'tapee2684f8-51': 1473725618.73996, 'tap6028e7a2-c0': None,
'tap9b365584-34': 1473725618.73996, 'tap0960ffac-f9': 1473725618.73996,
'tap7ba5f865-54': 1473725616.7399597, 'tap66ef2d8e-3b': 1473725618.73996,
'tapfe427ba3-63': 1473725616.7399597, 'tap475f33ef-c3': None}, 'removed':
set([]), 'added': set([]), 'updated': set(['tap422b85d9-95', 'tap9b365584-34',
'tapee2684f8-51', 'tap66ef2d8e-3b'])} daemon_loop
/opt/stack/new/neutron/neutron/plugins/ml2/drivers/agent/_common_agent.py:448
This leads to the agent refetching the details, which puts the port in BUILD
and then back to ACTIVE. This leads to sporadic failures when tempest tests are
asserting that a port should be in the ACTIVE status.
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https://bugs.launchpad.net/neutron/+bug/1622833/+subscriptions
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