VM migration in RHEV environment failed due to libvirt error "Failed to inquire lock: No such process"

Issue

• All VMs running on a specific RHEV host could not be migrated to any other host.

• The vdsm logs on the source host contain an "libvirtError: Failed to inquire lock: No such process" error;

Thread-202::ERROR::2014-04-14 14:29:21,774::vm::338::vm.Vm::(run) vmId=`ac0d50b1-1ecf-487d-bf1d-afb9e9b030fb`::Failed to migrate
Traceback (most recent call last):
  File "/usr/share/vdsm/vm.py", line 324, in run
    self._startUnderlyingMigration()
  File "/usr/share/vdsm/vm.py", line 406, in _startUnderlyingMigration
    None, maxBandwidth)
  File "/usr/share/vdsm/vm.py", line 845, in f
    ret = attr(*args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/vdsm/libvirtconnection.py", line 76, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/libvirt.py", line 1178, in migrateToURI2
    if ret == -1: raise libvirtError ('virDomainMigrateToURI2() failed', dom=self)
libvirtError: Failed to inquire lock: No such process

• The vdsm logs on the destination host contain;

Thread-179721::ERROR::2014-04-14 14:29:17,692::vm::2169::vm.Vm::(_startUnderlyingVm) vmId=`ac0d50b1-1ecf-487d-bf1d-afb9e9b030fb`::The vm start process failed
Traceback (most recent call last):
  File "/usr/share/vdsm/vm.py", line 2147, in _startUnderlyingVm
    self._waitForIncomingMigrationFinish()
  File "/usr/share/vdsm/vm.py", line 3571, in _waitForIncomingMigrationFinish
    self._connection.lookupByUUIDString(self.id),
  File "/usr/lib64/python2.6/site-packages/vdsm/libvirtconnection.py", line 76, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/libvirt.py", line 2858, in lookupByUUIDString
    if ret is None:raise libvirtError('virDomainLookupByUUIDString() failed', conn=self)
libvirtError: Domain not found: no domain with matching uuid 'ac0d50b1-1ecf-487d-bf1d-afb9e9b030fb'