I, or rather smb :) was wondering what could still be mounted that would
prevent an overmount, so I added another debug output, that of `mount`
right after `mount -n -o move /dev ${rootmnt}/dev`:

    Begin: Running /scripts/init-bottom ... rootfs on / type rootfs (rw)
    sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
    proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
    udev on /root/dev type devtmpfs 
(rw,relatime,size=2019088k,nr_inodes=504772,mode=755)
    devpts on /root/dev/pts type devpts 
(rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    tmpfs on /run type tmpfs (rw,nosuid,relatime,size=811332k,mode=755)
    fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
    /dev/vda on /root type ext4 
(ro,relatime,user_xattr,acl,barrier=1,data=ordered)
    done.
    run-init: nuking initramfs contents: Directory not empty
    [    6.357963] Kernel panic - not syncing: Attempted to kill init!
    [    6.359092] Pid: 1, comm: run-init Not tainted 3.0.0-12-server #20-Ubuntu
    [    6.360413] Call Trace:
    [    6.360893]  [<ffffffff815e8184>] panic+0x91/0x194
    [    6.361913]  [<ffffffff810626c5>] forget_original_parent+0x245/0x250
    [    6.363086]  [<ffffffff810626e7>] exit_notify+0x17/0x150
    [    6.364123]  [<ffffffff81062feb>] do_exit+0x1fb/0x440
    [    6.365066]  [<ffffffff81063387>] sys_exit+0x17/0x20
    [    6.366001]  [<ffffffff81606c02>] system_call_fastpath+0x16/0x1b

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https://bugs.launchpad.net/bugs/613273

Title:
  kernel panic on ec2 in system_call_fastpath

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