>
> After about 7 rounds I get this in messages of the host where the VM is
> running:
>
> Feb  1 23:31:39 ovmsrv06 kernel: dd: sending ioctl 80306d02 to a partition!
> Feb  1 23:31:39 ovmsrv06 kernel: dd: sending ioctl 80306d02 to a partition!
> Feb  1 23:31:44 ovmsrv06 kernel: dd: sending ioctl 80306d02 to a partition!
> Feb  1 23:31:45 ovmsrv06 kernel: dd: sending ioctl 80306d02 to a partition!
> Feb  1 23:31:45 ovmsrv06 kernel: dd: sending ioctl 80306d02 to a partition!
> Feb  1 23:31:47 ovmsrv06 kernel: dd: sending ioctl 80306d02 to a partition!
> Feb  1 23:31:50 ovmsrv06 kernel: dd: sending ioctl 80306d02 to a partition!
> Feb  1 23:31:50 ovmsrv06 kernel: dd: sending ioctl 80306d02 to a partition!
> Feb  1 23:31:56 ovmsrv06 kernel: dd: sending ioctl 80306d02 to a partition!
> Feb  1 23:31:57 ovmsrv06 kernel: dd: sending ioctl 80306d02 to a partition!

This is interesting, we have seen this messages before, but could never
detect the flow causing them, are you sure you see this each time you extend
your disk?

If you can reproduce this, please file a bug.