Public bug reported:

Description
===========
Occasionally, when performing live migration, the instance goes to ERROR state 
with the message "UnexpectedTaskStateError: Conflict updating instance XXXX. 
Expected: {'task_state': [u'migrating']}. Actual: {'task_state': None}"
The migration is always successful so far and the instance is always found 
residing on the target host. Updating the instances table "node" and "host" 
rows in the nova database with the destination host and then resetting the 
instance state to ACTIVE gets things back in order.

The issue appears to occur randomly across 16 uniform compute nodes and
seems like a race condition.

Steps to reproduce
==================
1. Boot an instance to Compute01
2. Issue a live-migrate command for instance targeting Compute02 (this can be 
done via Horizon and via python-openstackclient)
    # openstack server migrate --shared-migration --live computehost02 
e8928cb2-afae-4cca-93db-f218e9f22324
3. Live-migration works, the instance remains accessible and is moved to the 
new host. However, ~20% of the time, the instance goes to ERROR state and some 
cleanup must be done in the database.
    MariaDB [nova]> update instances set 
node='computehost02',host='computehost02' where uuid= 
'e8928cb2-afae-4cca-93db-f218e9f22324';
    # openstack server set --state active e8928cb2-afae-4cca-93db-f218e9f22324

Expected result
===============
The migrated instance should move successfully and return to ACTIVE state.

Actual result
=============
Instances occassional end up in ERROR state after a "successful" live-migration.

Environment
===========
1. This is a Newton environment with Nova Libvirt/KVM backed by Ceph. 
Networking is provided by Neutron ML2 linux bridge agent.
    root@computehost02:~# nova-compute --version
    14.0.8
    root@computehost02:~# dpkg -l | grep libvir
    ii  libvirt-bin                          1.3.1-1ubuntu10.15                 
        amd64        programs for the libvirt library
    ii  libvirt0:amd64                       1.3.1-1ubuntu10.15                 
        amd64        library for interfacing with different virtualization 
systems
    ii  python-libvirt                       1.3.1-1ubuntu1.1                   
        amd64        libvirt Python bindings
    root@computehost02:~# dpkg -l | grep qemu
    ii  ipxe-qemu                            
1.0.0+git-20150424.a25a16d-1ubuntu1.2      all          PXE boot firmware - ROM 
images for qemu
    ii  qemu                                 1:2.5+dfsg-5ubuntu10.16            
        amd64        fast processor emulator
    ii  qemu-block-extra:amd64               1:2.5+dfsg-5ubuntu10.16            
        amd64        extra block backend modules for qemu-system and qemu-utils
    ii  qemu-slof                            20151103+dfsg-1ubuntu1             
        all          Slimline Open Firmware -- QEMU PowerPC version
    ii  qemu-system                          1:2.5+dfsg-5ubuntu10.16            
        amd64        QEMU full system emulation binaries
    ii  qemu-system-arm                      1:2.5+dfsg-5ubuntu10.16            
        amd64        QEMU full system emulation binaries (arm)
    ii  qemu-system-common                   1:2.5+dfsg-5ubuntu10.16            
        amd64        QEMU full system emulation binaries (common files)
    ii  qemu-system-mips                     1:2.5+dfsg-5ubuntu10.16            
        amd64        QEMU full system emulation binaries (mips)
    ii  qemu-system-misc                     1:2.5+dfsg-5ubuntu10.16            
        amd64        QEMU full system emulation binaries (miscelaneous)
    ii  qemu-system-ppc                      1:2.5+dfsg-5ubuntu10.16            
        amd64        QEMU full system emulation binaries (ppc)
    ii  qemu-system-sparc                    1:2.5+dfsg-5ubuntu10.16            
        amd64        QEMU full system emulation binaries (sparc)
    ii  qemu-system-x86                      1:2.5+dfsg-5ubuntu10.16            
        amd64        QEMU full system emulation binaries (x86)
    ii  qemu-user                            1:2.5+dfsg-5ubuntu10.16            
        amd64        QEMU user mode emulation binaries
    ii  qemu-utils                           1:2.5+dfsg-5ubuntu10.16            
        amd64        QEMU utilities
    root@computehost02:~#

    root@cephhost:~# dpkg -l | grep -i ceph
    ii  ceph                                 10.2.10-1xenial                    
        amd64        distributed storage and file system
    ii  ceph-base                            10.2.10-1xenial                    
        amd64        common ceph daemon libraries and management tools
    ii  ceph-common                          10.2.10-1xenial                    
        amd64        common utilities to mount and interact with a ceph storage 
cluster
    ii  ceph-mon                             10.2.10-1xenial                    
        amd64        monitor server for the ceph storage system
    ii  ceph-osd                             10.2.10-1xenial                    
        amd64        OSD server for the ceph storage system
    ii  libcephfs1                           10.2.10-1xenial                    
        amd64        Ceph distributed file system client library
    ii  python-cephfs                        10.2.10-1xenial                    
        amd64        Python libraries for the Ceph libcephfs library
    ii  python-rados                         10.2.10-1xenial                    
        amd64        Python libraries for the Ceph librados library
    ii  python-rbd                           10.2.10-1xenial                    
        amd64        Python libraries for the Ceph librbd library
    root@cephhost:~#

Logs & Configs
==============
This is the specific error message that the target host generates in 
nova-compute.log:
oslo_messaging.rpc.server [req-1b4d172c-89b7-4e58-9a11-739e3a479499 
1926acfd1f341056c1aee48802ca49a4b5e2bbc0145b3f3b1bee46d3a5aa84cc 
397b1ee0a002419fbbfa13b43fe81482 - - -] Exception during message handling
oslo_messaging.rpc.server Traceback (most recent call last):
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/rpc/server.py",
 line 133, in _process_incoming
oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py",
 line 150, in dispatch
oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, 
args)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py",
 line 121, in _do_dispatch
oslo_messaging.rpc.server     result = func(ctxt, **new_args)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/exception_wrapper.py",
 line 75, in wrapped
oslo_messaging.rpc.server     function_name, call_dict, binary)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 220, in __exit__
oslo_messaging.rpc.server     self.force_reraise()
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 196, in force_reraise
oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/exception_wrapper.py",
 line 66, in wrapped
oslo_messaging.rpc.server     return f(self, context, *args, **kw)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/compute/utils.py",
 line 613, in decorated_function
oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/compute/manager.py",
 line 216, in decorated_function
oslo_messaging.rpc.server     kwargs['instance'], e, sys.exc_info())
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 220, in __exit__
oslo_messaging.rpc.server     self.force_reraise()
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 196, in force_reraise
oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/compute/manager.py",
 line 204, in decorated_function
oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/compute/manager.py",
 line 5611, in post_live_migration_at_destination
oslo_messaging.rpc.server     
instance.save(expected_task_state=task_states.MIGRATING)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_versionedobjects/base.py",
 line 210, in wrapper
oslo_messaging.rpc.server     ctxt, self, fn.__name__, args, kwargs)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/conductor/rpcapi.py",
 line 241, in object_action
oslo_messaging.rpc.server     objmethod=objmethod, args=args, kwargs=kwargs)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/rpc/client.py",
 line 169, in call
oslo_messaging.rpc.server     retry=self.retry)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/transport.py",
 line 97, in _send
oslo_messaging.rpc.server     timeout=timeout, retry=retry)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py",
 line 584, in send
oslo_messaging.rpc.server     retry=retry)
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py",
 line 575, in _send
oslo_messaging.rpc.server     raise result
oslo_messaging.rpc.server UnexpectedTaskStateError_Remote: Conflict updating 
instance e8928cb2-afae-4cca-93db-f218e9f22324. Expected: {'task_state': 
[u'migrating']}. Actual: {'task_state': None}
oslo_messaging.rpc.server Traceback (most recent call last):
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/conductor/manager.py",
 line 87, in _object_dispatch
oslo_messaging.rpc.server     return getattr(target, method)(*args, **kwargs)
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_versionedobjects/base.py",
 line 226, in wrapper
oslo_messaging.rpc.server     return fn(self, *args, **kwargs)
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/objects/instance.py",
 line 761, in save
oslo_messaging.rpc.server     columns_to_join=_expected_cols(expected_attrs))
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/db/api.py", 
line 838, in instance_update_and_get_original
oslo_messaging.rpc.server     expected=expected)
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py",
 line 169, in wrapper
oslo_messaging.rpc.server     return f(*args, **kwargs)
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_db/api.py", 
line 151, in wrapper
oslo_messaging.rpc.server     ectxt.value = e.inner_exc
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 220, in __exit__
oslo_messaging.rpc.server     self.force_reraise()
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 196, in force_reraise
oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_db/api.py", 
line 139, in wrapper
oslo_messaging.rpc.server     return f(*args, **kwargs)
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py",
 line 240, in wrapped
oslo_messaging.rpc.server     return f(context, *args, **kwargs)
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py",
 line 2637, in instance_update_and_get_original
oslo_messaging.rpc.server     context, instance_uuid, values, expected, 
original=instance_ref))
oslo_messaging.rpc.server
oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py",
 line 2773, in _instance_update
oslo_messaging.rpc.server     raise exc(**exc_props)
oslo_messaging.rpc.server
oslo_messaging.rpc.server UnexpectedTaskStateError: Conflict updating instance 
e8928cb2-afae-4cca-93db-f218e9f22324. Expected: {'task_state': [u'migrating']}. 
Actual: {'task_state': None}
oslo_messaging.rpc.server
oslo_messaging.rpc.server

** Affects: nova
     Importance: Undecided
         Status: New

-- 
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https://bugs.launchpad.net/bugs/1752986

Title:
  Live migrate UnexpectedTaskStateError

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  Occasionally, when performing live migration, the instance goes to ERROR 
state with the message "UnexpectedTaskStateError: Conflict updating instance 
XXXX. Expected: {'task_state': [u'migrating']}. Actual: {'task_state': None}"
  The migration is always successful so far and the instance is always found 
residing on the target host. Updating the instances table "node" and "host" 
rows in the nova database with the destination host and then resetting the 
instance state to ACTIVE gets things back in order.

  The issue appears to occur randomly across 16 uniform compute nodes
  and seems like a race condition.

  Steps to reproduce
  ==================
  1. Boot an instance to Compute01
  2. Issue a live-migrate command for instance targeting Compute02 (this can be 
done via Horizon and via python-openstackclient)
      # openstack server migrate --shared-migration --live computehost02 
e8928cb2-afae-4cca-93db-f218e9f22324
  3. Live-migration works, the instance remains accessible and is moved to the 
new host. However, ~20% of the time, the instance goes to ERROR state and some 
cleanup must be done in the database.
      MariaDB [nova]> update instances set 
node='computehost02',host='computehost02' where uuid= 
'e8928cb2-afae-4cca-93db-f218e9f22324';
      # openstack server set --state active e8928cb2-afae-4cca-93db-f218e9f22324

  Expected result
  ===============
  The migrated instance should move successfully and return to ACTIVE state.

  Actual result
  =============
  Instances occassional end up in ERROR state after a "successful" 
live-migration.

  Environment
  ===========
  1. This is a Newton environment with Nova Libvirt/KVM backed by Ceph. 
Networking is provided by Neutron ML2 linux bridge agent.
      root@computehost02:~# nova-compute --version
      14.0.8
      root@computehost02:~# dpkg -l | grep libvir
      ii  libvirt-bin                          1.3.1-1ubuntu10.15               
          amd64        programs for the libvirt library
      ii  libvirt0:amd64                       1.3.1-1ubuntu10.15               
          amd64        library for interfacing with different virtualization 
systems
      ii  python-libvirt                       1.3.1-1ubuntu1.1                 
          amd64        libvirt Python bindings
      root@computehost02:~# dpkg -l | grep qemu
      ii  ipxe-qemu                            
1.0.0+git-20150424.a25a16d-1ubuntu1.2      all          PXE boot firmware - ROM 
images for qemu
      ii  qemu                                 1:2.5+dfsg-5ubuntu10.16          
          amd64        fast processor emulator
      ii  qemu-block-extra:amd64               1:2.5+dfsg-5ubuntu10.16          
          amd64        extra block backend modules for qemu-system and 
qemu-utils
      ii  qemu-slof                            20151103+dfsg-1ubuntu1           
          all          Slimline Open Firmware -- QEMU PowerPC version
      ii  qemu-system                          1:2.5+dfsg-5ubuntu10.16          
          amd64        QEMU full system emulation binaries
      ii  qemu-system-arm                      1:2.5+dfsg-5ubuntu10.16          
          amd64        QEMU full system emulation binaries (arm)
      ii  qemu-system-common                   1:2.5+dfsg-5ubuntu10.16          
          amd64        QEMU full system emulation binaries (common files)
      ii  qemu-system-mips                     1:2.5+dfsg-5ubuntu10.16          
          amd64        QEMU full system emulation binaries (mips)
      ii  qemu-system-misc                     1:2.5+dfsg-5ubuntu10.16          
          amd64        QEMU full system emulation binaries (miscelaneous)
      ii  qemu-system-ppc                      1:2.5+dfsg-5ubuntu10.16          
          amd64        QEMU full system emulation binaries (ppc)
      ii  qemu-system-sparc                    1:2.5+dfsg-5ubuntu10.16          
          amd64        QEMU full system emulation binaries (sparc)
      ii  qemu-system-x86                      1:2.5+dfsg-5ubuntu10.16          
          amd64        QEMU full system emulation binaries (x86)
      ii  qemu-user                            1:2.5+dfsg-5ubuntu10.16          
          amd64        QEMU user mode emulation binaries
      ii  qemu-utils                           1:2.5+dfsg-5ubuntu10.16          
          amd64        QEMU utilities
      root@computehost02:~#

      root@cephhost:~# dpkg -l | grep -i ceph
      ii  ceph                                 10.2.10-1xenial                  
          amd64        distributed storage and file system
      ii  ceph-base                            10.2.10-1xenial                  
          amd64        common ceph daemon libraries and management tools
      ii  ceph-common                          10.2.10-1xenial                  
          amd64        common utilities to mount and interact with a ceph 
storage cluster
      ii  ceph-mon                             10.2.10-1xenial                  
          amd64        monitor server for the ceph storage system
      ii  ceph-osd                             10.2.10-1xenial                  
          amd64        OSD server for the ceph storage system
      ii  libcephfs1                           10.2.10-1xenial                  
          amd64        Ceph distributed file system client library
      ii  python-cephfs                        10.2.10-1xenial                  
          amd64        Python libraries for the Ceph libcephfs library
      ii  python-rados                         10.2.10-1xenial                  
          amd64        Python libraries for the Ceph librados library
      ii  python-rbd                           10.2.10-1xenial                  
          amd64        Python libraries for the Ceph librbd library
      root@cephhost:~#

  Logs & Configs
  ==============
  This is the specific error message that the target host generates in 
nova-compute.log:
  oslo_messaging.rpc.server [req-1b4d172c-89b7-4e58-9a11-739e3a479499 
1926acfd1f341056c1aee48802ca49a4b5e2bbc0145b3f3b1bee46d3a5aa84cc 
397b1ee0a002419fbbfa13b43fe81482 - - -] Exception during message handling
  oslo_messaging.rpc.server Traceback (most recent call last):
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/rpc/server.py",
 line 133, in _process_incoming
  oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py",
 line 150, in dispatch
  oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, 
ctxt, args)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py",
 line 121, in _do_dispatch
  oslo_messaging.rpc.server     result = func(ctxt, **new_args)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/exception_wrapper.py",
 line 75, in wrapped
  oslo_messaging.rpc.server     function_name, call_dict, binary)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 220, in __exit__
  oslo_messaging.rpc.server     self.force_reraise()
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 196, in force_reraise
  oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/exception_wrapper.py",
 line 66, in wrapped
  oslo_messaging.rpc.server     return f(self, context, *args, **kw)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/compute/utils.py",
 line 613, in decorated_function
  oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/compute/manager.py",
 line 216, in decorated_function
  oslo_messaging.rpc.server     kwargs['instance'], e, sys.exc_info())
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 220, in __exit__
  oslo_messaging.rpc.server     self.force_reraise()
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 196, in force_reraise
  oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/compute/manager.py",
 line 204, in decorated_function
  oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/compute/manager.py",
 line 5611, in post_live_migration_at_destination
  oslo_messaging.rpc.server     
instance.save(expected_task_state=task_states.MIGRATING)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_versionedobjects/base.py",
 line 210, in wrapper
  oslo_messaging.rpc.server     ctxt, self, fn.__name__, args, kwargs)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/conductor/rpcapi.py",
 line 241, in object_action
  oslo_messaging.rpc.server     objmethod=objmethod, args=args, kwargs=kwargs)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/rpc/client.py",
 line 169, in call
  oslo_messaging.rpc.server     retry=self.retry)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/transport.py",
 line 97, in _send
  oslo_messaging.rpc.server     timeout=timeout, retry=retry)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py",
 line 584, in send
  oslo_messaging.rpc.server     retry=retry)
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py",
 line 575, in _send
  oslo_messaging.rpc.server     raise result
  oslo_messaging.rpc.server UnexpectedTaskStateError_Remote: Conflict updating 
instance e8928cb2-afae-4cca-93db-f218e9f22324. Expected: {'task_state': 
[u'migrating']}. Actual: {'task_state': None}
  oslo_messaging.rpc.server Traceback (most recent call last):
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/conductor/manager.py",
 line 87, in _object_dispatch
  oslo_messaging.rpc.server     return getattr(target, method)(*args, **kwargs)
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_versionedobjects/base.py",
 line 226, in wrapper
  oslo_messaging.rpc.server     return fn(self, *args, **kwargs)
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/objects/instance.py",
 line 761, in save
  oslo_messaging.rpc.server     columns_to_join=_expected_cols(expected_attrs))
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/db/api.py", 
line 838, in instance_update_and_get_original
  oslo_messaging.rpc.server     expected=expected)
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py",
 line 169, in wrapper
  oslo_messaging.rpc.server     return f(*args, **kwargs)
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_db/api.py", 
line 151, in wrapper
  oslo_messaging.rpc.server     ectxt.value = e.inner_exc
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 220, in __exit__
  oslo_messaging.rpc.server     self.force_reraise()
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_utils/excutils.py",
 line 196, in force_reraise
  oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/oslo_db/api.py", 
line 139, in wrapper
  oslo_messaging.rpc.server     return f(*args, **kwargs)
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py",
 line 240, in wrapped
  oslo_messaging.rpc.server     return f(context, *args, **kwargs)
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py",
 line 2637, in instance_update_and_get_original
  oslo_messaging.rpc.server     context, instance_uuid, values, expected, 
original=instance_ref))
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server   File 
"/openstack/venvs/nova-r14.5.0/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py",
 line 2773, in _instance_update
  oslo_messaging.rpc.server     raise exc(**exc_props)
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server UnexpectedTaskStateError: Conflict updating 
instance e8928cb2-afae-4cca-93db-f218e9f22324. Expected: {'task_state': 
[u'migrating']}. Actual: {'task_state': None}
  oslo_messaging.rpc.server
  oslo_messaging.rpc.server

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