Have you been able to verify whether this does not happen when virt-
manager is not running?
Please try the following:
sudo mv /var/log/libvirt/libvirtd.log /var/log/libvirt/libvirtd.log.orig
echo "log_level = 1" | sudo tee -a /etc/libvirt/libvirtd.conf
sudo stop libvirt-bin; sudo start libvirt-bin
Then after one of the VMs has shut itself down,
sudo cp /var/log/libvirt/libvirtd.log /var/log/libvirt/log.submit
sudo stop libvirt-bin
sudo sed -i '/^log_level/d' /etc/libvirt/libvirtd.conf
sudo start libvirt-bin
Then attach /var/log/libvirt/log.submit to this report. This should
provide more debugging information from libvirt about what has happened.
** Changed in: libvirt (Ubuntu)
Status: New => Incomplete
** Changed in: qemu-kvm (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1022901
Title:
Ubuntu 12.04 64bit Guest (qemu/kvm) dies randomly
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