Suspend Instance 时报异常，如何处理

code: 500
message: libvirtError

internal error unable to send file handle 'migrate': No file descriptor supplied via SCM_RIGHTS
  File "/usr/lib/python2.6/site-packages/nova-2012.1.1-py2.6.egg/nova/compute/manager.py", line 177, in decorated_function
    return function(self, context, instance_uuid, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/nova-2012.1.1-py2.6.egg/nova/compute/manager.py", line 1550, in suspend_instance
    self.driver.suspend(instance_ref)
  File "/usr/lib/python2.6/site-packages/nova-2012.1.1-py2.6.egg/nova/exception.py", line 114, in wrapped
    return f(*args, **kw)
  File "/usr/lib/python2.6/site-packages/nova-2012.1.1-py2.6.egg/nova/virt/libvirt/connection.py", line 819, in suspend
    dom.managedSave(0)
  File "/usr/lib64/python2.6/site-packages/libvirt.py", line 789, in managedSave
    if ret == -1: raise libvirtError ('virDomainManagedSave() failed', dom=self)

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