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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