[Bug 759394] Re: can not umount rbind mounts

[Ivan Zakharyaschev]

This worked for me correctly --
https://unix.stackexchange.com/a/264488/4319 :

mount --rbind /dev /mnt/test
mount --make-rslave /mnt/test
umount -R /mnt/test

It was important to have the two first commands as two separate
commands: do not combine --rbind and --make-rslave in one invocation of
mount.

Without --make-rslave , the behavior was unwanted (and not successful):

* umount -l would affect the original old mountpoints, too,
* and umount -R would be affected by the busy (open) files under the original old mountpoints. (Very unexpected...)

** Changed in: util-linux (Ubuntu)
       Status: Confirmed => Opinion

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

Title:
  can not umount rbind mounts

Status in util-linux package in Ubuntu:
  Opinion

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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