Hot Plugging a vCPU causes the Guest system time to jump forward with error "smpboot: do_boot_cpu failed(-1) to wakeup CPU"

Solution Verified - Updated -


  • CPU hot plug on a KVM Guest with long uptime cause:
    • time de-synchronization
    • error smpboot: do_boot_cpu failed(-1) to wakeup CPU in the logs


  • Red Hat Enterprise Linux 7, 8
    • Red Hat Virtualization 4.x
    • KVM

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