Comment 12 for bug 1354167

I just had the chance to help debugging another case of this, and it turned out that qemu-img snapshot was used on the image while the VM is running. This was likely the root cause of the corruption. So if you're reading this, it's probably already too late, but I want to spell it out anyway:

WARNING: Never open the same disk image from two processes at the same time, except if both are read-only! If your VM is running, use the qemu monitor of that VM (or libvirt functionality, which will do the same internally) to do operations on the image. Use qemu-img only for images of shut down VMs.

If you reported in this bug that you are affected, can you please reply and specify whether you ever used qemu-img (except for read-only subcommands) on your image while the VM was running?