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[Bug 1358609] [NEW] ENOENT error breaks update_status() of libvirt driver

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Public bug reported:

ENOENT error breaks update_status() during PowerKVM testing. It should
be a bug of libvirt driver.

Exception log:

2014-08-15 16:03:59.038 42817 ERROR nova.openstack.common.periodic_task [-] Error during PowerVCComputeManager.update_available_resource: [Errno 2] No such file or directory: '/mnt//nova/instances/2132a870-ad5e-4d42-a43c-
ca1e93fe7eeb/disk'
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task Traceback (most recent call last):
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/openstack/common/periodic_task.py", line 198, in run_periodic_tasks
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     task(self, context)
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 5667, in update_available_resource
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     rt.update_available_resource(context)
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/powervc_nova/compute/manager.py", line 3805, in update_available_resource
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     self.driver.get_host_stats(refresh=True)
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5026, in get_host_stats
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     return self.host_state.get_host_stats(refresh=refresh)
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/powervc_nova/virt/powerkvm/driver.py", line 1688, in get_host_stats
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     self._data = self.update_status()
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/powervc_nova/virt/powerkvm/driver.py", line 1693, in update_status
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     data = super(PowerKVMHostState, self).update_status()
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5515, in update_status
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     data['disk_available_least'] = _get_disk_available_least()
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5488, in _get_disk_available_least
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     disk_over_committed = (self.driver.
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4984, in _get_disk_over_committed_size_total
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     self._get_instance_disk_info(dom.name(), xml))
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4937, in _get_instance_disk_info
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     dk_size = int(os.path.getsize(path))
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib64/python2.7/genericpath.py", line 49, in getsize
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     return os.stat(filename).st_size
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task OSError: [Errno 2] No such file or directory: '/mnt//nova/instances/2132a870-ad5e-4d42-a43c-ca1e93fe7eeb/disk'
2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: libvirt

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https://bugs.launchpad.net/bugs/1358609

Title:
  ENOENT error breaks update_status() of libvirt driver

Status in OpenStack Compute (Nova):
  New

Bug description:
  ENOENT error breaks update_status() during PowerKVM testing. It should
  be a bug of libvirt driver.

  Exception log:

  2014-08-15 16:03:59.038 42817 ERROR nova.openstack.common.periodic_task [-] Error during PowerVCComputeManager.update_available_resource: [Errno 2] No such file or directory: '/mnt//nova/instances/2132a870-ad5e-4d42-a43c-
  ca1e93fe7eeb/disk'
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task Traceback (most recent call last):
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/openstack/common/periodic_task.py", line 198, in run_periodic_tasks
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     task(self, context)
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 5667, in update_available_resource
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     rt.update_available_resource(context)
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/powervc_nova/compute/manager.py", line 3805, in update_available_resource
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     self.driver.get_host_stats(refresh=True)
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5026, in get_host_stats
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     return self.host_state.get_host_stats(refresh=refresh)
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/powervc_nova/virt/powerkvm/driver.py", line 1688, in get_host_stats
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     self._data = self.update_status()
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/powervc_nova/virt/powerkvm/driver.py", line 1693, in update_status
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     data = super(PowerKVMHostState, self).update_status()
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5515, in update_status
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     data['disk_available_least'] = _get_disk_available_least()
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 5488, in _get_disk_available_least
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     disk_over_committed = (self.driver.
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4984, in _get_disk_over_committed_size_total
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     self._get_instance_disk_info(dom.name(), xml))
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4937, in _get_instance_disk_info
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     dk_size = int(os.path.getsize(path))
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task   File "/usr/lib64/python2.7/genericpath.py", line 49, in getsize
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task     return os.stat(filename).st_size
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task OSError: [Errno 2] No such file or directory: '/mnt//nova/instances/2132a870-ad5e-4d42-a43c-ca1e93fe7eeb/disk'
  2014-08-15 16:03:59.038 42817 TRACE nova.openstack.common.periodic_task

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