Looks like parsing is all fine. I recreated the error by enabling debug and seeing the qemu hmp command passed, then I launched my own instance and surfaced the HMP monitor, when I repeated the drive_add command it complained, unknown protocol rbd; this is the result of qemu being launched by libvirt and libvirt's apparmor policy not allowing qemu to mmap the needed block libraries.
[ 9606.350763] type=1400 audit(1442421386.001:26): apparmor="DENIED" operation="file_mmap" profile="libvirt-1b1ecffb-bddc-4825-8adb-3dce71fbcc57" name="/usr/lib/x86_64-linux-gnu/qemu/block-curl.so" pid=23428 comm="qemu-system-x86" requested_mask="m" denied_mask="m" fsuid=107 ouid=0 [ 9606.350902] type=1400 audit(1442421386.001:27): apparmor="DENIED" operation="file_mmap" profile="libvirt-1b1ecffb-bddc-4825-8adb-3dce71fbcc57" name="/usr/lib/x86_64-linux-gnu/qemu/block-rbd.so" pid=23428 comm="qemu-system-x86" requested_mask="m" denied_mask="m" fsuid=107 ouid=0 -- 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/1495895 Title: Unable to attach rados block device to instances To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1495895/+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
