Comment 1 for bug 470636

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Jamie Strandboge (jdstrand) wrote : Re: virt-aa-helper fails to add copy-on-write images on apparmor profile

Thank you for using Ubuntu and taking the time to report a bug. For now, you must add the readonly file to /etc/apparmor.d/libvirt/libvirt-<uuid> (don't add it to the dynamically generated libvirt-<uuid>.files file). After that you can shutdown the virtual machine and after that it will work as expected.

I am going to mark this wishlist for now. While this is a bug, libvirt does not support snapshotting by using cow files. This will be fixed when the upstream sVirt plugin framework supports snapshotting via cow files.