Why do RHV/KVM: RHEL5 guests seem hung following a live migration to a RHEL 7.5 Hypervisor?

Solution Verified - Updated -


  • After a migration, a RHEL5 guest goes unresponsive
  • The VM seems hung after migration, indefinitely, for several seconds or even dozens of minutes
  • Console seems frozen
  • SSH is very slow, after some time it seems to recover
  • Why do I see CPU soft lockups and poor performance on RHEL5 guest?


  • Red Hat Virtualization
    • Red Hat Enterprise Linux 7.5 Hosts/Hypervisors
      • kernel-3.10.0-862*
    • Red Hat Enterprise Linux 5 (RHEL5) guests
  • Red Hat Enterprise Linux 7.5 KVM Hosts

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