How to find out which process hangs tightly VM Server 2016 on qemu/kvm?

Question

KVM

The virtual machine hangs for one or two minutes every three or four days so that it does not even process pings to it, any connection breaks (ssh, rdp, spice server). It won't let me reconnect.
htop at such moments on the host shows all the cores of this VM are 100% loaded.
When it becomes available again, then, of course, there is nothing in the processes.
How can you see which process loaded the kernels, but after the fact, when the server is already available again.

Answer 1

htop at such moments on the host shows all the cores of this VM are 100% loaded.

Even at such moments, look at the iotop host. It is possible that the processor is busy with IO wait.

Answer 2

1. If you are so sure that the VM is being hung up, and not an incorrectly configured config for this virtual machine,
then collect the server logs
https://help.tableau.com/current/server/en-us/perf...
2 .is it worth QEMU Guest Agent on VM?
Is something running on the host at this moment, such as a backup, service or maintenance tasks?
is NUMA enabled? is Ballooning memory used? for this VM