Hello,
I am running libvirt-2.0.0-10.el7_3.2.x86_64 on CentOS 7.3, I have few vms of CentOS and Windows 2012 servers.
Randomly they are hung, but the status of virtual machine keep running, vnc and network not responding.
I have checked all /var/log/messages and /var/log/libvirt/qemu/vm.log but nothing found anything wrong.