Public bug reported:

I  am running a Dell vostro laptop with a factory disk setup having a large C: 
partition with Windows Vista Home Basic, and a D: partition which is a Dell 
dedicated "restore" system, which is practically useless from Windows.  
Installing Ubuntu on this D: partition results in a /dev/sda2 with 3.0 Gib of 
free space mounted as /host, and a /dev/loop0 with 1.5 Gib free mounted  as /. 
I therefore have a dual boot system in which Ubuntu takes effectively no disk 
space. All this was done using 9.04 and worked perfectly.
   After I upgraded to 9.10 the shutdown started failing. During the shutdown,  
a black (console) screen will appear with a display like: (I am typing this 
from a picture on my cell phone -- might be slightly wrong)
v v v v v 
* Shutting down ALSA . . .
init: network-manager main pro [(edge of photo here)
init: Disconnectied from system [
modem-manager: Caught signa[
 * Stopping virtual private net    [
 * Asking all  remaining process[
 * Deconfiguring network interf [
 * Deactivating swap ...             [
[ 3452.240095] Buffer I/O error on device loop0, logical block 898763
^ ^ ^ ^ ^ ^
at which point the shutdown hangs forever.
The actual error number and block number will be different for different 
attempts. The shutdown will fail at different points.
The common thing is that there will always be one or more I/O errors on loop0, 
and the shutdown will never complete, and "Deactivating swap" will be near the 
failure point.

 The last failure - for which I will include the dumps - is not (unfortunately) 
the one I took the 'screenshot' of.
It failed with
[ 512.404091] Buffer I/O error on device loop0, logical block 898774
.

ProblemType: Bug
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  vernon     1681 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf6dfc000 irq 21'
   Mixer name   : 'Conexant CX20561 (Hermosa)'
   Components   : 'HDA:14f15051,1028029a,00100000'
   Controls      : 15
   Simple ctrls  : 8
Date: Sun Nov  1 08:04:58 2009
DistroRelease: Ubuntu 9.10
MachineType: Dell Inc. Vostro A860
Package: linux-image-2.6.31-14-generic 2.6.31-14.48
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: root=UUID=88EC3720EC3707C8 loop=/hostname/disks/root.disk ro quiet 
splash
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 linux-backports-modules-2.6.31-14-generic N/A
 linux-firmware 1.24
SourcePackage: linux
Uname: Linux 2.6.31-14-generic i686
WifiSyslog:
 Nov  1 07:58:19 ubuntu NetworkManager: <info>  (wlan0): supplicant connection 
state:  completed -> group handshake
 Nov  1 07:58:19 ubuntu NetworkManager: <info>  (wlan0): supplicant connection 
state:  group handshake -> completed
WpaSupplicantLog:
 
dmi.bios.date: 09/18/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A02
dmi.board.name: 0Y487G
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA02:bd09/18/2008:svnDellInc.:pnVostroA860:pvr:rvnDellInc.:rn0Y487G:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Vostro A860
dmi.sys.vendor: Dell Inc.

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


** Tags: apport-bug i386

-- 
Karmic fails on shutdown when loop installed on D:
https://bugs.launchpad.net/bugs/468756
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