Comment 10 for bug 917339

@barry - do you use lvm with schroot? I do and I am also affected by this bug.

 $ schroot -e --all-sessions
E: 10mount: umount: /var/lib/schroot/mount/saucy-amd64-29694a5f-0def-40d4-9d3d-95bc27fa70f7: device is busy.
E: 10mount: (In some cases useful info about processes that use
E: 10mount: the device is found by lsof(8) or fuser(1))
E: saucy-amd64-29694a5f-0def-40d4-9d3d-95bc27fa70f7: Chroot setup failed: stage=setup-stop

from /proc/mounts:

/dev/mapper/virtual--vg-saucy--amd64--29694a5f--0def--40d4--9d3d--95bc27fa70f7 /var/lib/schroot/mount/saucy-amd64-29694a5f-0def-40d4-9d3d-95bc27fa70f7 ext4 rw,noatime,data=ordered 0 0

I wonder if this is related to bug 1223576 at all.