Public bug reported:
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.
** Affects: util-linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/759394
Title:
can not umount rbind mounts
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