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OVM 3 Guest VM Hang with message "Clocksource tsc unstable" (Doc ID 2241977.1)

Last updated on SEPTEMBER 08, 2021

Applies to:

Oracle VM - Version 3.3.3 and later
Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64


The Guest VM hung while increasing the vCPU and the vmcore was generated.

According to vmcore log, below is the error:

installing Xen timer for CPU 5
Clocksource tsc unstable (delta = -2888770892163 ns). Enable clocksource failover by adding clocksource_failover kernel parameter.

VMcore :



 Tried to add extra vCPU to the guest VM.


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