Red Hat Bugzilla – Bug 1301860
vCPU offline hang in real-time guest
Last modified: 2017-07-06 00:34:56 EDT
There are some known hotplug issues on kernel-rt. For an example, see BZ1267425.
On this BZ I was able to identify the root cause by inspecting a
vmcore, and on these cases, the vmcore is the best tool to understand
why the system hanged.
Can you please capture a vmcore of the VM after it hangs on hotplug
Here is a document from support explaining how to capture a vmcore of a VM:
We will also need the debuginfo packages of the kernel that was running
on the VM.