Created attachment 688597 [details]
engine.log

Description of problem:
Hot-unplug fails when trying to unplug and change MAC address for nic under running VM 

Version-Release number of selected component (if applicable):
rhevm-3.2.0-5.el6ev.noarch
vdsm-4.10.2-4.0.el6ev.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Create VM with 1 nic and start the VM
2.while the VM is up hot-unplug the nic and change the MAC address (one operation)

  
Actual results:
Error and operation fails.

Expected results:
operation should pass without any errors.

Additional info:
from engine - 2013-01-27 21:34:38,993 ERROR [org.ovirt.engine.core.bll.network.vm.ActivateDeactivateVmNicCommand] (ajp-/127.0.0.1:8702-15) [7de5865d] Command org.ovirt.engine.core.bll.network.vm.ActivateDea
ctivateVmNicCommand throw Vdc Bll exception. With error message VdcBLLException: org.ovirt.engine.core.vdsbroker.vdsbroker.VDSErrorException: VDSGenericException: VDSErrorException: Failed to
HotUnplugNicVDS, error = Unexpected exception

from VDSM - Thread-29801::ERROR::2013-01-28 09:34:24,803::libvirtvm::1717::vm.Vm::(hotunplugNic) vmId=`0e0147fb-4ebe-4c45-a530-2ee76120a5aa`::Hotunplug NIC failed - NIC not found: {'nicModel': 'pv', 'macA
ddr': '00:14:14:14:14:14', 'linkActive': 'true', 'network': 'rhevm', 'filter': 'vdsm-no-mac-spoofing', 'specParams': {}, 'deviceId': 'f8011197-741e-4ba2-9449-255dd4974b6e', 'address': {'bus':
'0x00', ' slot': '0x06', ' domain': '0x0000', ' type': 'pci', ' function': '0x0'}, 'device': 'bridge', 'type': 'interface'}
Thread-29801::ERROR::2013-01-28 09:34:24,806::BindingXMLRPC::932::vds::(wrapper) unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/BindingXMLRPC.py", line 918, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/BindingXMLRPC.py", line 263, in vmHotunplugNic
    return vm.hotunplugNic(params)
  File "/usr/share/vdsm/API.py", line 407, in hotunplugNic
    return curVm.hotunplugNic(params)
  File "/usr/share/vdsm/libvirtvm.py", line 1718, in hotunplugNic
    hooks.after_nic_hotunplug_fail(nicXml, self.conf)
UnboundLocalError: local variable 'nicXml' referenced before assignment