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[Sander Smeenk <ubuntu@xxxxxxxxxxxx>]

Public bug reported:

Ubuntu Trusty, util-linux 2.20.1-5.1ubuntu20.3

I can't 'umount -f /mnt/storage' an NFS-filesystem whose remote end has
gone missing. The process just stalls in an uninterruptable state.
Strace shows umount at some point tries to readlink() the mount point
which stalls because that mount point is broken. Which is why i want to
force umount it. ;)

I then proceeded to remove 99% of umount.c's code so it would just call
umount2() on the target with the FORCE flag, recompiled the binary and
it 'neatly' unmounted the filesystem.

I think umount.c tries too many sanity checks with -f enabled.
It should perhaps ask if the user is really sure, and then just call umount on the target and fix mtab etc...

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1466581

Title:
  Unable to unmount 'hung NFS mount' (server gone) with FORCE and/or
  LAZY

Status in util-linux package in Ubuntu:
  New

Bug description:
  Ubuntu Trusty, util-linux 2.20.1-5.1ubuntu20.3

  I can't 'umount -f /mnt/storage' an NFS-filesystem whose remote end
  has gone missing. The process just stalls in an uninterruptable state.
  Strace shows umount at some point tries to readlink() the mount point
  which stalls because that mount point is broken. Which is why i want
  to force umount it. ;)

  I then proceeded to remove 99% of umount.c's code so it would just
  call umount2() on the target with the FORCE flag, recompiled the
  binary and it 'neatly' unmounted the filesystem.

  I think umount.c tries too many sanity checks with -f enabled.
  It should perhaps ask if the user is really sure, and then just call umount on the target and fix mtab etc...

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