FWIW the following 2 commits in qemu master resolve the issue for qemu- img.
http://git.qemu.org/?p=qemu.git;a=commit;h=38c4d0aea3e1264c86e282d99560330adf2b6e25 http://git.qemu.org/?p=qemu.git;a=commit;h=7c15903789953ead14a417882657d52dc0c19a24 If possible they should be back ported to trusty and utopic. You'll also need something like: http://git.qemu.org/?p=qemu.git;a=commit;h=4f11aa8a40351b28c0e67c7276e0003b38cc46ac before my 2 patches. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1368815 Title: qemu-img convert intermittently corrupts output images To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1368815/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs