[Bug 529502] Re: cryptsetup luksClose fails with "busy"

[scar]

i have this issue too on lucid with cryptsetup 2:1.1.0~rc2-1ubuntu13
although the suggested work-around does not work for me.  i've plugged
in an external disk taken out of another ubuntu installation:

$ sudo cryptsetup luksOpen /dev/sde5 sde5_crypt
(this makes available the -root and -swap partitions in /dev/mapper)

$ sudo mount /dev/mapper/laptop-root /mnt/laptop-root
(now i have just moved some files from the partition and am ready to unmount)

$ sudo umount /mnt/laptop-root/
$ sudo cryptsetup luksClose sde5_crypt
Device sde5_crypt is busy.
$

is there any way to cleanly remove the drive without shutting down the
whole system??

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https://bugs.launchpad.net/bugs/529502

Title:
  cryptsetup luksClose fails with "busy"

Status in “cryptsetup” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: nautilus

  Encrypted LUKS volume lives in /dev/sdb1 (first partition in external
  USB HDD)

  Steps:

  1) Plug USB HDD
  2) Choose Places -> Encrypted volume
  3) Type password in dialog

  Volume is sucesfully mounted and nautilus window is open on mount
  point

  4) Choose File -> Umount

  Expected: partition is unmounted and encryted block device is removed
  from /dev/mapper

  Result: volume is unmouted, cryptsetup fails to remove encrypted block device in /dev/mapper with error:
  Error locking device: cryptsetup exited with exit code 240: Device udisks-luks-uuid-[...] is busy.

  Manually running cryptsetup luksClose udisks-luks-uuid-[...]
  afterwards works as expected.

  ProblemType: Bug
  Architecture: amd64
  Date: Sun Feb 28 16:16:53 2010
  DistroRelease: Ubuntu 10.04
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100219)
  Package: nautilus 1:2.29.91-0ubuntu1
  ProcEnviron:
   LANGUAGE=es_ES.utf8
   PATH=(custom, user)
   LANG=es_ES.utf8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-14.20-generic
  SourcePackage: nautilus
  Uname: Linux 2.6.32-14-generic x86_64