This patch set was never accepted that way, but yeah reviving that might be an option to work around this. Also this was long ago, but the lock rewrite/enablement happened only recently so a totally new approach might be needed (or is present without us knowing).
We might ping qemu-devel about that to be clear of too much assumptions. To help with that I found that repro could be as easy as: 1. start a guest 2. get the blockinfo and pick a disk 3. run qemu-img info on it while running Example: #1 (any other kvm guest will do as well) uvt-simplestreams-libvirt --verbose sync --source http://cloud-images.ubuntu.com/daily arch=amd64 label=daily release=xenial uvt-kvm create --password=ubuntu xenial-test release=xenial arch=amd64 label=daily #2 Depending on how you started it you might know the path already virsh domblklist xenial-test Target Source ------------------------------------------------ vda /var/lib/uvtool/libvirt/images/xenial-test.qcow vdb /var/lib/uvtool/libvirt/images/xenial-test-ds.qcow #3 check img info $ qemu-img info /var/lib/uvtool/libvirt/images/xenial-test.qcow qemu-img: Could not open '/var/lib/uvtool/libvirt/images/xenial-test.qcow': Failed to get shared "write" lock Is another process using the image? To simplify further - we don't care what the guest does: $ qemu-img create -f qcow2 /tmp/test.qcow2 1M $ qemu-system-x86_64 -hda /tmp/test.qcow2 -enable-kvm -nodefaults -nographic & $ qemu-img info /tmp/test.qcow2 qemu-img: Could not open '/tmp/test.qcow2': Failed to get shared "write" lock Is another process using the image? I't won't get easier, but that might be great to re-trigger the old nolock thread. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1718133 Title: Live block migration in Pike fails due to qemu-img To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nova/+bug/1718133/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
