I'm on 12.04

in my case I'm seeing libvirtd continuesly respawning and mounting the device 
some how.
umount /var/lib/schroot/mount/precise-2d97fb31-1cae-47e4-a363-0a652a518610/dev
root@bork:~# lsof | grep 
/var/lib/schroot/mount/precise-2d97fb31-1cae-47e4-a363-0a652a518610/dev
dbus-daem 19780    messagebus    0u      CHR                1,3      0t0       
5826 /var/lib/schroot/mount/precise-2d97fb31-1cae-47e4-a363-0a652a518610/dev/nul
tgtd      19794          root    0u      CHR                1,3      0t0       
5826 
/var/lib/schroot/mount/precise-2d97fb31-1cae-47e4-a363-0a652a518610/dev/null
libvirtd  19913          root    0r      CHR                1,3      0t0       
5826 
/var/lib/schroot/mount/precise-2d97fb31-1cae-47e4-a363-0a652a518610/dev/null

usually attempting to kill the processes just ends up in them respawning and 
magically remounting the directories. I can tell this by 
I see message in dmesg to the effect of libvirt-bin terminated. Then right 
below it I see another message saying libvirtd-bin process e ended respawning.

The main culprits is usually udev though.

rebooting is problematic too if the schroot daemon picks up old sessions
in the /var/lib/schroot/sessions directory and mounts those directories.
:|


Seems the only sure fire way I've found is to delete the sessions directory and 
reboot. then I can umount them. And yes they misteresly are mounted some how.

I can't ease the schroots root directory unless I do this process and I
was useing schroot so I could quickly ease a linux environment and start
from scratch. Whats the status on this bug. It seems like the inability
to forcefully umount the directories is the main cause of head ache.

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https://bugs.launchpad.net/bugs/917339

Title:
  10mount: umount: /<<CHROOT>>/dev: device is busy

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