Public bug reported:

Description
===========
After evacuation, nova-compute where VMs were evacuated could not restart 
emitting InstanceNotFound exception when init_host() called.


Steps to reproduce
==================
0) service nova-compute stop at 'compute01'
1) nova evacuate 'compute01'
2) nova delete 'server at compute01'
3) service nova-compute restart at 'compute01'


Expected result
===============
nova-compute normally started

Actual result
=============
nova-compute could not started

Environment
===========
1. Exact version of OpenStack you are running. See the following
  list for all releases: http://docs.openstack.org/releases/

  stable/ocata

2. Which hypervisor did you use?
   (For example: Libvirt + KVM, Libvirt + XEN, Hyper-V, PowerKVM, ...)
   What's the version of that?
 
  libvirt + kvm

2. Which storage type did you use?
   (For example: Ceph, LVM, GPFS, ...)
   What's the version of that?

   Ceph


3. Which networking type did you use?
   (For example: nova-network, Neutron with OpenVSwitch, ...)
   neutron with linux bridge   


Logs & Configs
==============
2019-02-26 16:24:29.015 8901 INFO nova.virt.libvirt.driver 
[req-dc2a5061-29aa-4097-9a3e-83de36804460 - - - - -] [instance: 
25ab917a-1506-4154-9902-5b8b550ec929] Deleting instance files 
/var/lib/nova/instances/25ab917a-1506-4154-9902-5b8b550ec929_del
2019-02-26 16:24:29.017 8901 INFO nova.virt.libvirt.driver 
[req-dc2a5061-29aa-4097-9a3e-83de36804460 - - - - -] [instance: 
25ab917a-1506-4154-9902-5b8b550ec929] Deletion of 
/var/lib/nova/instances/25ab917a-1506-4154-9902-5b8b550ec929_del complete
2019-02-26 16:24:29.020 8901 DEBUG oslo_messaging._drivers.amqpdriver 
[req-dc2a5061-29aa-4097-9a3e-83de36804460 - - - - -] CALL msg_id: 
9bbf4371e977450d98a519dac213592b exchange 'nova' topic 'conductor' _send 
/opt/openstack/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py:550
2019-02-26 16:24:29.085 8901 DEBUG oslo_messaging._drivers.amqpdriver [-] 
received reply msg_id: 9bbf4371e977450d98a519dac213592b __call__ 
/opt/openstack/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py:407
2019-02-26 16:24:29.093 8901 DEBUG oslo_messaging._drivers.amqpdriver 
[req-dc2a5061-29aa-4097-9a3e-83de36804460 - - - - -] CAST unique_id: 
d5a0d3b93fbf42b6a379b9507e9c2a9a FANOUT topic 'scheduler' _send 
/opt/openstack/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py:539
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service 
[req-dc2a5061-29aa-4097-9a3e-83de36804460 - - - - -] Error starting thread.
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service Traceback (most recent 
call last):
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_service/service.py", line 722, 
in run_service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     service.start()
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/service.py", line 144, in start
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     
self.manager.init_host()
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/compute/manager.py", line 1155, in init_host
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     
self._destroy_evacuated_instances(context)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/compute/manager.py", line 674, in 
_destroy_evacuated_instances
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     bdi, destroy_disks)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/virt/libvirt/driver.py", line 915, in destroy
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     destroy_disks, 
migrate_data)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/virt/libvirt/driver.py", line 1034, in cleanup
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     instance.save()
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_versionedobjects/base.py", 
line 210, in wrapper
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     ctxt, self, 
fn.__name__, args, kwargs)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/conductor/rpcapi.py", line 244, in object_action
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     
objmethod=objmethod, args=args, kwargs=kwargs)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 
169, in call
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     retry=self.retry)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_messaging/transport.py", line 
97, in _send
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     timeout=timeout, 
retry=retry)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py",
 line 566, in send
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     retry=retry)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py",
 line 557, in _send
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     raise result
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service 
InstanceNotFound_Remote: Instance 25ab917a-1506-4154-9902-5b8b550ec929 could 
not be found.
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service Traceback (most recent 
call last):
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/conductor/manager.py", line 93, in 
_object_dispatch
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     return 
getattr(target, method)(*args, **kwargs)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_versionedobjects/base.py", 
line 226, in wrapper
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     return fn(self, 
*args, **kwargs)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/objects/instance.py", line 792, in save
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     
columns_to_join=_expected_cols(expected_attrs))
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/db/api.py", line 840, in 
instance_update_and_get_original
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     expected=expected)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/db/sqlalchemy/api.py", line 180, in wrapper
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     return f(*args, 
**kwargs)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_db/api.py", line 151, in 
wrapper
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     ectxt.value = 
e.inner_exc
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, 
in __exit__
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, 
in force_reraise
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_db/api.py", line 139, in 
wrapper
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     return f(*args, 
**kwargs)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/db/sqlalchemy/api.py", line 251, in wrapped
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     return f(context, 
*args, **kwargs)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/db/sqlalchemy/api.py", line 2714, in 
instance_update_and_get_original
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     
columns_to_join=columns_to_join)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/db/sqlalchemy/api.py", line 1910, in 
_instance_get_by_uuid
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     raise 
exception.InstanceNotFound(instance_id=uuid)
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service InstanceNotFound: 
Instance 25ab917a-1506-4154-9902-5b8b550ec929 could not be found.
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
2019-02-26 16:24:29.102 8901 DEBUG oslo_concurrency.lockutils 
[req-67496f45-7809-41c4-a6a1-365574533016 - - - - -] Acquired semaphore 
"singleton_lock" lock 
/opt/openstack/lib/python2.7/site-packages/oslo_concurrency/lockutils.py:212
2019-02-26 16:24:29.103 8901 DEBUG oslo_concurrency.lockutils 
[req-67496f45-7809-41c4-a6a1-365574533016 - - - - -] Releasing semaphore 
"singleton_lock" lock 
/opt/openstack/lib/python2.7/site-packages/oslo_concurrency/lockutils.py:225

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1817670

Title:
  nova-compute could not destroy evacuated instance which was deleted

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  After evacuation, nova-compute where VMs were evacuated could not restart 
emitting InstanceNotFound exception when init_host() called.

  
  Steps to reproduce
  ==================
  0) service nova-compute stop at 'compute01'
  1) nova evacuate 'compute01'
  2) nova delete 'server at compute01'
  3) service nova-compute restart at 'compute01'

  
  Expected result
  ===============
  nova-compute normally started

  Actual result
  =============
  nova-compute could not started

  Environment
  ===========
  1. Exact version of OpenStack you are running. See the following
    list for all releases: http://docs.openstack.org/releases/

    stable/ocata

  2. Which hypervisor did you use?
     (For example: Libvirt + KVM, Libvirt + XEN, Hyper-V, PowerKVM, ...)
     What's the version of that?
   
    libvirt + kvm

  2. Which storage type did you use?
     (For example: Ceph, LVM, GPFS, ...)
     What's the version of that?

     Ceph

  
  3. Which networking type did you use?
     (For example: nova-network, Neutron with OpenVSwitch, ...)
     neutron with linux bridge   

  
  Logs & Configs
  ==============
  2019-02-26 16:24:29.015 8901 INFO nova.virt.libvirt.driver 
[req-dc2a5061-29aa-4097-9a3e-83de36804460 - - - - -] [instance: 
25ab917a-1506-4154-9902-5b8b550ec929] Deleting instance files 
/var/lib/nova/instances/25ab917a-1506-4154-9902-5b8b550ec929_del
  2019-02-26 16:24:29.017 8901 INFO nova.virt.libvirt.driver 
[req-dc2a5061-29aa-4097-9a3e-83de36804460 - - - - -] [instance: 
25ab917a-1506-4154-9902-5b8b550ec929] Deletion of 
/var/lib/nova/instances/25ab917a-1506-4154-9902-5b8b550ec929_del complete
  2019-02-26 16:24:29.020 8901 DEBUG oslo_messaging._drivers.amqpdriver 
[req-dc2a5061-29aa-4097-9a3e-83de36804460 - - - - -] CALL msg_id: 
9bbf4371e977450d98a519dac213592b exchange 'nova' topic 'conductor' _send 
/opt/openstack/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py:550
  2019-02-26 16:24:29.085 8901 DEBUG oslo_messaging._drivers.amqpdriver [-] 
received reply msg_id: 9bbf4371e977450d98a519dac213592b __call__ 
/opt/openstack/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py:407
  2019-02-26 16:24:29.093 8901 DEBUG oslo_messaging._drivers.amqpdriver 
[req-dc2a5061-29aa-4097-9a3e-83de36804460 - - - - -] CAST unique_id: 
d5a0d3b93fbf42b6a379b9507e9c2a9a FANOUT topic 'scheduler' _send 
/opt/openstack/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py:539
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service 
[req-dc2a5061-29aa-4097-9a3e-83de36804460 - - - - -] Error starting thread.
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service Traceback (most 
recent call last):
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_service/service.py", line 722, 
in run_service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     service.start()
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/service.py", line 144, in start
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     
self.manager.init_host()
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/compute/manager.py", line 1155, in init_host
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     
self._destroy_evacuated_instances(context)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/compute/manager.py", line 674, in 
_destroy_evacuated_instances
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     bdi, 
destroy_disks)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/virt/libvirt/driver.py", line 915, in destroy
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     destroy_disks, 
migrate_data)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/virt/libvirt/driver.py", line 1034, in cleanup
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     instance.save()
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_versionedobjects/base.py", 
line 210, in wrapper
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     ctxt, self, 
fn.__name__, args, kwargs)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/conductor/rpcapi.py", line 244, in object_action
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     
objmethod=objmethod, args=args, kwargs=kwargs)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 
169, in call
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     retry=self.retry)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_messaging/transport.py", line 
97, in _send
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     timeout=timeout, 
retry=retry)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py",
 line 566, in send
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     retry=retry)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py",
 line 557, in _send
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     raise result
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service 
InstanceNotFound_Remote: Instance 25ab917a-1506-4154-9902-5b8b550ec929 could 
not be found.
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service Traceback (most 
recent call last):
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/conductor/manager.py", line 93, in 
_object_dispatch
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     return 
getattr(target, method)(*args, **kwargs)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_versionedobjects/base.py", 
line 226, in wrapper
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     return fn(self, 
*args, **kwargs)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/objects/instance.py", line 792, in save
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     
columns_to_join=_expected_cols(expected_attrs))
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/db/api.py", line 840, in 
instance_update_and_get_original
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     expected=expected)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/db/sqlalchemy/api.py", line 180, in wrapper
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     return f(*args, 
**kwargs)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_db/api.py", line 151, in 
wrapper
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     ectxt.value = 
e.inner_exc
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, 
in __exit__
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, 
in force_reraise
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/lib/python2.7/site-packages/oslo_db/api.py", line 139, in 
wrapper
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     return f(*args, 
**kwargs)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/db/sqlalchemy/api.py", line 251, in wrapped
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     return f(context, 
*args, **kwargs)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/db/sqlalchemy/api.py", line 2714, in 
instance_update_and_get_original
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     
columns_to_join=columns_to_join)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service   File 
"/opt/openstack/src/nova/nova/db/sqlalchemy/api.py", line 1910, in 
_instance_get_by_uuid
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service     raise 
exception.InstanceNotFound(instance_id=uuid)
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service InstanceNotFound: 
Instance 25ab917a-1506-4154-9902-5b8b550ec929 could not be found.
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.097 8901 ERROR oslo_service.service
  2019-02-26 16:24:29.102 8901 DEBUG oslo_concurrency.lockutils 
[req-67496f45-7809-41c4-a6a1-365574533016 - - - - -] Acquired semaphore 
"singleton_lock" lock 
/opt/openstack/lib/python2.7/site-packages/oslo_concurrency/lockutils.py:212
  2019-02-26 16:24:29.103 8901 DEBUG oslo_concurrency.lockutils 
[req-67496f45-7809-41c4-a6a1-365574533016 - - - - -] Releasing semaphore 
"singleton_lock" lock 
/opt/openstack/lib/python2.7/site-packages/oslo_concurrency/lockutils.py:225

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