Some processes refused to die

libvirtError.txt

Traceback (most recent call last):
  File "/opt/stack/nova/nova/compute/manager.py", line 2394, in do_terminate_ins
    self._delete_instance(context, instance, bdms, quotas)
  File "/opt/stack/nova/nova/hooks.py", line 131, in inner
    rv = f(*args, **kwargs)
  File "/opt/stack/nova/nova/compute/manager.py", line 2363, in _delete_instance
    quotas.rollback()
  File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__
    six.reraise(self.type_, self.value, self.tb)
  File "/opt/stack/nova/nova/compute/manager.py", line 2340, in _delete_instance
    self._shutdown_instance(context, instance, bdms)
  File "/opt/stack/nova/nova/compute/manager.py", line 2270, in _shutdown_instan
    requested_networks)
  File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__
    six.reraise(self.type_, self.value, self.tb)
  File "/opt/stack/nova/nova/compute/manager.py", line 2259, in _shutdown_instan
    block_device_info)
  File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 976, in destroy
    self._destroy(instance)
  File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 932, in _destroy
    instance=instance)
  File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__
    six.reraise(self.type_, self.value, self.tb)
  File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 904, in _destroy
    virt_dom.destroy()
  File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 179, in doit
    result = proxy_call(self._autowrap, f, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 139, in proxy_
    rv = execute(f,*args,**kwargs)
  File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 77, in tworker
    rv = meth(*args,**kwargs)
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 918, in destroy
    if ret == -1: raise libvirtError ('virDomainDestroy() failed', dom=self)
libvirtError: internal error: Some processes refused to die