About a situation that live migration would never complete

Solution Verified - Updated -

Issue

 If the original guest modifies pages faster than KVM can transfer them to the destination host, offline migration must be used, as live migration would never complete.
  • Is there any example about case that 'the original guest modifies pages faster than KVM can transfer them to the destination host'?
  • Also, it says that live migration would never complete, but what behavior is it concretely?
  • Is there any recommended method to cancel migration using virsh or virt-manager except for killing of processes (virsh and virt-manager)?

Environment

  • Red Hat Enterprise Linux 6.3

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