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[Bug 1442656] [NEW] live migration fails, because incorrect arguments order passed to method

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Public bug reported:

steps to reproduce:
1.boot instance
2. call nova live-migration instance

2015-04-10 09:03:42.621 ERROR root [req-73637bbe-9a23-4ce9-92c8-d3bbceaf8341 admin admin] Original exception being dropped: ['Traceback (most recent call last):\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 340, in decorated_function\n    return function(self, context, *args, **kwargs)\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 5202, in live_migration\n    expected_attrs=expected)\n', '  File "/opt/stack/nova/nova/objects/instance.py", line 489, in _from_db_object\n    instance[field] = db_inst[field]\n', 'TypeError: string indices must be integers\n']
2015-04-10 09:03:42.622 ERROR oslo_messaging.rpc.dispatcher [req-73637bbe-9a23-4ce9-92c8-d3bbceaf8341 admin admin] Exception during message handling: 'unicode' object has no attribute 'uuid'
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher Traceback (most recent call last):
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     executor_callback))
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     executor_callback)
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/nova/nova/compute/manager.py", line 6663, in live_migration
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     migrate_data=migrate_data)
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/nova/nova/exception.py", line 88, in wrapped
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     payload)
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/nova/nova/exception.py", line 71, in wrapped
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     return f(self, context, *args, **kw)
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/nova/nova/compute/manager.py", line 352, in decorated_function
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     kwargs['instance'], e, sys.exc_info())
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/nova/nova/compute/utils.py", line 87, in add_instance_fault_from_exc
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     fault_obj.instance_uuid = instance.uuid
2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher AttributeError: 'unicode' object has no attribute 'uuid'

** Affects: nova
     Importance: Undecided
     Assignee: Timofey Durakov (tdurakov)
         Status: In Progress


** Tags: live-migration rpcapi

** Changed in: nova
     Assignee: (unassigned) => Timofey Durakov (tdurakov)

** Changed in: nova
       Status: New => Confirmed

** Changed in: nova
       Status: Confirmed => In Progress

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https://bugs.launchpad.net/bugs/1442656

Title:
  live migration fails, because incorrect arguments order passed to
  method

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  steps to reproduce:
  1.boot instance
  2. call nova live-migration instance

  2015-04-10 09:03:42.621 ERROR root [req-73637bbe-9a23-4ce9-92c8-d3bbceaf8341 admin admin] Original exception being dropped: ['Traceback (most recent call last):\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 340, in decorated_function\n    return function(self, context, *args, **kwargs)\n', '  File "/opt/stack/nova/nova/compute/manager.py", line 5202, in live_migration\n    expected_attrs=expected)\n', '  File "/opt/stack/nova/nova/objects/instance.py", line 489, in _from_db_object\n    instance[field] = db_inst[field]\n', 'TypeError: string indices must be integers\n']
  2015-04-10 09:03:42.622 ERROR oslo_messaging.rpc.dispatcher [req-73637bbe-9a23-4ce9-92c8-d3bbceaf8341 admin admin] Exception during message handling: 'unicode' object has no attribute 'uuid'
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher Traceback (most recent call last):
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     executor_callback))
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     executor_callback)
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/nova/nova/compute/manager.py", line 6663, in live_migration
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     migrate_data=migrate_data)
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/nova/nova/exception.py", line 88, in wrapped
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     payload)
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/nova/nova/exception.py", line 71, in wrapped
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     return f(self, context, *args, **kw)
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/nova/nova/compute/manager.py", line 352, in decorated_function
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     kwargs['instance'], e, sys.exc_info())
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/nova/nova/compute/utils.py", line 87, in add_instance_fault_from_exc
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher     fault_obj.instance_uuid = instance.uuid
  2015-04-10 09:03:42.622 TRACE oslo_messaging.rpc.dispatcher AttributeError: 'unicode' object has no attribute 'uuid'

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