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[Phillip Susi <psusi@xxxxxxxxxx>]

It looks like something on your system was using a file in /mnt, thus it
could not be unmounted.  You can find out what program is doing so by
using lsof.

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https://bugs.launchpad.net/bugs/1358310

Title:
  using umount with bash wildcard ends in "device is busy" for mount of
  parent directory

Status in “util-linux” package in Ubuntu:
  Incomplete

Bug description:
  hi,

  i've run into a problem on ubuntu 14.04 while mounting an ganeti
  instance for doing some chroot stuff. but the problem itself not
  related to ganeti or any other virtualization. its just a problem
  while mounting/unmounting some devices.

  so heres an example how to reproduce the problem:

  lvcreate -L 1G -n test system
  lvcreate -L 1G -n test2 system
  mkfs.ext4 /dev/system/test
  mkfs.ext4 /dev/system/test2
  mount /dev/system/test /mnt/
  mkdir /mnt/test2
  mount /dev/system/test2 /mnt/test2/
  ln -sf /etc/issue /mnt/
  umount /mnt/*
  umount /mnt/
  lvremove -f /dev/system/test2
  lvremove -f /dev/system/test

  if i run this commands /mnt/ is still mounted and it is only possible
  to umount it using "-l" switch. but after this it is still not
  possible to remove the logical volume because it says "Logical volume
  system/test contains a filesystem in use."

  if i run the same commands but without the "ln -sf /etc/issue /mnt/"
  everything is okay. also if i replace "umount /mnt/*" with "umount
  /mnt/boot" everything works.

  so it seems like umount ist opening /etc/issue for some reason if a
  bash wildcard is used and not releasing it. checking with lsof or
  fuser does not show any open files under /mnt/ nor for /etc/issue.

  the problem does not exist with ubuntu 12.04.

  a solution for this problem would be great because if you often do
  some chroot stuff it is easier to use "umount /mnt/*" to umount all
  bind mounts like /proc/ or /sys/ than running a umount command for
  each mount.

  also i havent found a way, other than reboot, to remove an open
  logical volume if it was hit by this problem.

  
  lsb_release -rd
  Description:    Ubuntu 14.04.1 LTS
  Release:        14.04

  
  regards
  the2nd

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