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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => juno-rc1

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https://bugs.launchpad.net/bugs/1374140

Title:
  Need to log the orignial libvirtError when InterfaceDetachFailed

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  This is not really useful:

  http://logs.openstack.org/17/123917/2/check/check-tempest-dsvm-
  neutron/4bc2052/logs/screen-n-cpu.txt.gz?level=TRACE#_2014-09-25_17_35_11_635

  2014-09-25 17:35:11.635 ERROR nova.virt.libvirt.driver [req-50afcbfb-203e-454d-a7eb-1549691caf77 TestNetworkBasicOps-985093118 TestNetworkBasicOps-1055683132] [instance: 960ee0b1-9c96-4d5b-b5f5-be76ae19a536] detaching network adapter failed.
  2014-09-25 17:35:11.635 27689 ERROR oslo.messaging.rpc.dispatcher [-] Exception during message handling: <nova.objects.instance.Instance object at 0x422fe90>
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/new/nova/nova/compute/manager.py", line 393, in decorated_function
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/new/nova/nova/compute/manager.py", line 4411, in detach_interface
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher     self.driver.detach_interface(instance, condemned)
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 1448, in detach_interface
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher     raise exception.InterfaceDetachFailed(instance)
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher InterfaceDetachFailed: <nova.objects.instance.Instance object at 0x422fe90>
  2014-09-25 17:35:11.635 27689 TRACE oslo.messaging.rpc.dispatcher 

  
  The code is logging that there was an error, but not the error itself:

          try:
              self.vif_driver.unplug(instance, vif)
              flags = libvirt.VIR_DOMAIN_AFFECT_CONFIG
              state = LIBVIRT_POWER_STATE[virt_dom.info()[0]]
              if state == power_state.RUNNING or state == power_state.PAUSED:
                  flags |= libvirt.VIR_DOMAIN_AFFECT_LIVE
              virt_dom.detachDeviceFlags(cfg.to_xml(), flags)
          except libvirt.libvirtError as ex:
              error_code = ex.get_error_code()
              if error_code == libvirt.VIR_ERR_NO_DOMAIN:
                  LOG.warn(_LW("During detach_interface, "
                               "instance disappeared."),
                           instance=instance)
              else:
                  LOG.error(_LE('detaching network adapter failed.'),
                           instance=instance)
                  raise exception.InterfaceDetachFailed(
                          instance_uuid=instance['uuid'])

  We should log the original libvirt error.

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