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[Russell Bryant <1274758@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova/havana
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1274758

Title:
  Error during ComputeManager.update_available_resource: 'NoneType'
  object has no attribute '__getitem__'

Status in OpenStack Compute (Nova):
  Fix Committed
Status in OpenStack Compute (nova) havana series:
  In Progress

Bug description:
  Error during ComputeManager.update_available_resource: 'NoneType'
  object has no attribute '__getitem__'

  
  ERROR nova.openstack.common.periodic_task [-] Error during ComputeManager.update_available_resource: 'NoneType' object has no attribute '__getitem__'
  TRACE nova.openstack.common.periodic_task Traceback (most recent call last):
  TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/openstack/common/periodic_task.py", line 182, in run_periodic_tasks
  TRACE nova.openstack.common.periodic_task     task(self, context)
  TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/compute/manager.py", line 5049, in update_available_resource
  TRACE nova.openstack.common.periodic_task     rt.update_available_resource(context)
  TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/openstack/common/lockutils.py", line 249, in inner
  TRACE nova.openstack.common.periodic_task     return f(*args, **kwargs)   
  TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/compute/resource_tracker.py", line 300, in update_available_resource
  TRACE nova.openstack.common.periodic_task     resources = self.driver.get_available_resource(self.nodename)
  TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 3943, in get_available_resource
  TRACE nova.openstack.common.periodic_task     stats = self.host_state.get_host_stats(refresh=True)
  TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 5016, in get_host_stats
  TRACE nova.openstack.common.periodic_task     self.update_status()
  TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 5052, in update_status
  TRACE nova.openstack.common.periodic_task     data["vcpus_used"] = self.driver.get_vcpu_used()
  TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 3626, in get_vcpu_used
  TRACE nova.openstack.common.periodic_task     total += len(vcpus[1])
  TRACE nova.openstack.common.periodic_task TypeError: 'NoneType' object has no attribute '__getitem__'
  TRACE nova.openstack.common.periodic_task 

  
  http://logs.openstack.org/51/63551/6/gate/gate-tempest-dsvm-postgres-full/4860441/logs/screen-n-cpu.txt.gz?level=TRACE#_2014-01-30_22_38_29_401

  Seen in the gate

  logstash query: message:"TypeError: 'NoneType' object has no attribute
  '__getitem__'" AND filename:"logs/screen-n-cpu.txt"

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