KVM machines freeze with 99% Host CPU

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Hi list,
I run two relatively small KVM machines with CentOS 7 on a FC27 Server. After some days, both machines freeze - both of them, with short delay if at all. On the host the kvm/qemu processes show 99% CPU and they have to be removed with e.g. "virsh destroy".

I have this scenario: https://forums.fedoraforum.org/showthread.php?317123-qemu-takes-100-of-a-core-freezes-the-VM

It happens on kernels 4.14 as well as 4.15. The host itself has no problems, there are no errors in logs. Any hints where to debug this?

regards
Jens
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