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[Steve Noyes <steve.noyes@xxxxxxxxxx>]

Public bug reported:

I hit an extra exception during a failed live migration rollback. This
exception occurred on the destination node. This bug is not about the
reason for the failed migration, but for the failure in the rollback.

The exception:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py", line 157, in _process_incoming
    res = self.dispatcher.dispatch(message)
  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 213, in dispatch
    return self._do_dispatch(endpoint, method, ctxt, args)
  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 183, in _do_dispatch
    result = func(ctxt, **new_args)
  File "/opt/stack/nova/nova/exception_wrapper.py", line 77, in wrapped
    function_name, call_dict, binary)
  File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
    self.force_reraise()
  File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
    six.reraise(self.type_, self.value, self.tb)
  File "/opt/stack/nova/nova/exception_wrapper.py", line 68, in wrapped
    return f(self, context, *args, **kw)
  File "/opt/stack/nova/nova/compute/manager.py", line 5090, in remove_volume_connection
    driver_bdm.driver_detach(context, instance, connector,
TypeError: driver_detach() takes exactly 5 arguments (6 given)


In compute manager.remove_volume_connection, this line calls driver_detach:

            driver_bdm.driver_detach(context, instance, connector,
                                     self.volume_api, self.driver)

This is driver_detach in block_device.DriverVolumeBlockDevice:

    def driver_detach(self, context, instance, volume_api, virt_driver):

The connector seems to be the culprit.

ubuntu xenial/libvirt/pike...

commit c2c6960e374351b3ce1b43a564b57e14b54c4877
Merge: 8d9eb67 95c190c
Author: Jenkins <jenkins@xxxxxxxxxxxxxxxxxxxx>
Date:   Mon May 15 17:45:36 2017 +0000

    Merge "Make discover_hosts only query for unmapped ComputeNode
records"

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1694535

Title:
  migration rollback: driver_detach called with wrong number of args

Status in OpenStack Compute (nova):
  New

Bug description:
  I hit an extra exception during a failed live migration rollback. This
  exception occurred on the destination node. This bug is not about the
  reason for the failed migration, but for the failure in the rollback.

  The exception:

  Traceback (most recent call last):
    File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py", line 157, in _process_incoming
      res = self.dispatcher.dispatch(message)
    File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 213, in dispatch
      return self._do_dispatch(endpoint, method, ctxt, args)
    File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 183, in _do_dispatch
      result = func(ctxt, **new_args)
    File "/opt/stack/nova/nova/exception_wrapper.py", line 77, in wrapped
      function_name, call_dict, binary)
    File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
      self.force_reraise()
    File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
      six.reraise(self.type_, self.value, self.tb)
    File "/opt/stack/nova/nova/exception_wrapper.py", line 68, in wrapped
      return f(self, context, *args, **kw)
    File "/opt/stack/nova/nova/compute/manager.py", line 5090, in remove_volume_connection
      driver_bdm.driver_detach(context, instance, connector,
  TypeError: driver_detach() takes exactly 5 arguments (6 given)

  
  In compute manager.remove_volume_connection, this line calls driver_detach:

              driver_bdm.driver_detach(context, instance, connector,
                                       self.volume_api, self.driver)

  This is driver_detach in block_device.DriverVolumeBlockDevice:

      def driver_detach(self, context, instance, volume_api,
  virt_driver):

  The connector seems to be the culprit.

  ubuntu xenial/libvirt/pike...

  commit c2c6960e374351b3ce1b43a564b57e14b54c4877
  Merge: 8d9eb67 95c190c
  Author: Jenkins <jenkins@xxxxxxxxxxxxxxxxxxxx>
  Date:   Mon May 15 17:45:36 2017 +0000

      Merge "Make discover_hosts only query for unmapped ComputeNode
  records"

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