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

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content