Description of problem:
Until some time last week I was able to start kvm guests, but now none of them will start.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Attempt to start any guest, either via virt-manager or virsh
virsh # start F13
error: Failed to start domain F13
error: internal error Process exited while reading console log output: char device redirected to /dev/pts/1
qemu: could not open disk image /mnt/backup/VM/F12-clone.img: Invalid argument
Tried rolling back libvirt to a previous version but didn't help (so am back on latest libvirt-0.8.1-6.el6).
*** This bug has been marked as a duplicate of bug 593909 ***