[Bug 759394] Re: can not umount rbind mounts

[gouri]

Hi.

Same problem here.  Some partitions still appear in `mount` output and `/proc/mounts` but can't be unmounted via either device name or mount point.
Repeatedly trying `umount -l` with device names and mount points finally managed to get the partitions unmounted.

Yet it feels awkward, like a worn out door lock that locks okay but you
have to shake for a while to have it unlock.

This is very likely not Ubuntu specific, e.g. 
http://unix.stackexchange.com/questions/120827/recursive-umount-after-rbind-mount

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https://bugs.launchpad.net/bugs/759394

Title:
  can not umount rbind mounts

Status in util-linux package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: util-linux

  mkdir /mnt/dev
  mount --rbind /dev /mnt/dev
  umount /mnt/dev

  The umount fails because of the sub mounts that the recursive bind
  also bind mounted under /mnt/dev, which you have to remove manually
  first.  When you mount with --rbind, umount should be able to reverse
  the process, unmounting all recursively bound mounts.

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