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[Bug 1727134] [NEW] XenAPI: resolve the failure VM_MISSING_PV_DRIVERS for PV VM

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Public bug reported:

When testing: tempest.api.compute.volumes.test_attach_volume.AttachVolumeTestJSON.test_attach_detach_volume
observed the error of "VM_MISSING_PV_DRIVERS"; But actually the VM does have PV drivers installed.

2017-10-25 02:17:29.566 ^[[01;31mERROR nova.virt.xenapi.vm_utils [^[[01;36mreq-7997faf5-5d5b-4312-a7c6-d5a45d431526 ^[[00;36mtempest-ServerActionsTestJSON-1628628303 tempest-ServerActionsTestJSON-1628628303^[[01;31m] ^[[01;35m^[[01;31mUnable to unplug VBD^[[00m^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00mTraceback (most recent call last):^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/opt/stack/nova/nova/virt/xenapi/vm_utils.py", line 333, in unplug_vbd^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    greenthread.sleep(1)^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/opt/stack/nova/nova/virt/xenapi/client/objects.py", line 94, in unplug^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    synchronized_unplug()^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py", line 271, in inner^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    return f(*args, **kwargs)^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/opt/stack/nova/nova/virt/xenapi/client/objects.py", line 89, in synchronized_unplug^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    self._call_method("unplug", vbd_ref)^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/opt/stack/nova/nova/virt/xenapi/client/objects.py", line 59, in _call_method^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    return self.session.call_xenapi(call, *args)^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/opt/stack/nova/nova/virt/xenapi/client/session.py", line 197, in call_xenapi^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    return session.xenapi_request(method, args)^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 133, in xenapi_request^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    result = _parse_result(getattr(self, methodname)(*full_params))^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 203, in _parse_result^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    raise Failure(result['ErrorDescription'])^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00mFailure: ['VM_MISSING_PV_DRIVERS', 'OpaqueRef:269c1940-69fd-c549-ed1d-1aefe725b967']^M
^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m^M

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1727134

Title:
  XenAPI: resolve the failure VM_MISSING_PV_DRIVERS for PV VM

Status in OpenStack Compute (nova):
  New

Bug description:
  When testing: tempest.api.compute.volumes.test_attach_volume.AttachVolumeTestJSON.test_attach_detach_volume
  observed the error of "VM_MISSING_PV_DRIVERS"; But actually the VM does have PV drivers installed.

  2017-10-25 02:17:29.566 ^[[01;31mERROR nova.virt.xenapi.vm_utils [^[[01;36mreq-7997faf5-5d5b-4312-a7c6-d5a45d431526 ^[[00;36mtempest-ServerActionsTestJSON-1628628303 tempest-ServerActionsTestJSON-1628628303^[[01;31m] ^[[01;35m^[[01;31mUnable to unplug VBD^[[00m^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00mTraceback (most recent call last):^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/opt/stack/nova/nova/virt/xenapi/vm_utils.py", line 333, in unplug_vbd^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    greenthread.sleep(1)^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/opt/stack/nova/nova/virt/xenapi/client/objects.py", line 94, in unplug^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    synchronized_unplug()^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py", line 271, in inner^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    return f(*args, **kwargs)^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/opt/stack/nova/nova/virt/xenapi/client/objects.py", line 89, in synchronized_unplug^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    self._call_method("unplug", vbd_ref)^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/opt/stack/nova/nova/virt/xenapi/client/objects.py", line 59, in _call_method^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    return self.session.call_xenapi(call, *args)^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/opt/stack/nova/nova/virt/xenapi/client/session.py", line 197, in call_xenapi^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    return session.xenapi_request(method, args)^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 133, in xenapi_request^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    result = _parse_result(getattr(self, methodname)(*full_params))^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m  File "/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 203, in _parse_result^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m    raise Failure(result['ErrorDescription'])^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00mFailure: ['VM_MISSING_PV_DRIVERS', 'OpaqueRef:269c1940-69fd-c549-ed1d-1aefe725b967']^M
  ^[[01;31m2017-10-25 02:17:29.566 TRACE nova.virt.xenapi.vm_utils ^[[01;35m^[[00m^M

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