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["Davanum Srinivas \(DIMS\)" <davanum@xxxxxxxxx>]

*** This bug is a duplicate of bug 1238374 ***
    https://bugs.launchpad.net/bugs/1238374

** This bug has been marked a duplicate of bug 1238374
   TypeError in periodic task 'update_available_resource'

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https://bugs.launchpad.net/bugs/1233767

Title:
  Error during ComputeManager.update_available_resource: 'NoneType'
  object is not iterable

Status in OpenStack Compute (Nova):
  Confirmed

Bug description:
  2013-10-01 16:29:18.979 25543 ERROR nova.virt.libvirt.driver [-] [instance: f3ed83a9-2e8f-4d6e-a462-ad35e88507b6] During wait destroy, instance disappeared.
  2013-10-01 16:30:04.240 25543 ERROR nova.openstack.common.periodic_task [-] Error during ComputeManager.update_available_resource: 'NoneType' object is not iterable
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task Traceback (most recent call last):
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/openstack/common/periodic_task.py", line 180, in run_periodic_tasks
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task     task(self, context)
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/compute/manager.py", line 4863, in update_available_resource
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task     rt.update_available_resource(context)
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/openstack/common/lockutils.py", line 246, in inner
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task     return f(*args, **kwargs)
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/compute/resource_tracker.py", line 318, in update_available_resource
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task     self.pci_tracker.clean_usage(instances, migrations, orphans)
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/pci/pci_manager.py", line 285, in clean_usage
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task     for dev in self.claims.pop(uuid):
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task TypeError: 'NoneType' object is not iterable
  2013-10-01 16:30:04.240 25543 TRACE nova.openstack.common.periodic_task 

  
  http://logs.openstack.org/35/43335/12/check/check-tempest-devstack-vm-full/49e7df0/logs/screen-n-cpu.txt.gz?level=TRACE#_2013-10-01_16_29_18_979

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