Loop device with root filesystem cannot be unmounted during shutdown

[RichardN]

Have installed ubuntu 9.04 using wubi (put wubi.exe and iso in same directory to install).
Upgraded to 9.10 karmic development branch using update-manager -d.

Upgrade went fine, but when system is now shutdown, shutdown procedure hangs. The problem is that the loop device cannot unmount the device that is running my root disk (20G image mounted on loop device).
Pressing ctrl-alt-del produces two more shutdown messages. One is about deactivating swap.....but that one does not succeed either...

So problem is in kernel / loop device or the shutdown order......which is configured in either the kernel or some shutdown script?

ProblemType: Bug
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: richard 1806 F.... pulseaudio
 /dev/snd/pcmC0D0p: richard 1806 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc400000 irq 22'
   Mixer name : 'SigmaTel STAC9872AK'
   Components : 'HDA:83847662,104d1c00,00100201 HDA:14f12c06,104d1700,00100000'
   Controls : 17
   Simple ctrls : 10
Date: Sun Oct 4 11:56:44 2009
DistroRelease: Ubuntu 9.10
MachineType: Sony Corporation VGN-FZ38M
NonfreeKernelModules: nvidia
Package: linux-generic 2.6.31.11.22
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: User Name=UUID=3CD4D829D4D7E366 loop=/hostname/disks/User Name.disk ro quiet splash usbcore.autosuspend=1
ProcEnviron:
 LANGUAGE=en_GB.UTF-8
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-11.38-generic
RelatedPackageVersions:
 linux-backports-modules-2.6.31-11-generic N/A
 linux-firmware 1.20
SourcePackage: linux-meta
Uname: Linux 2.6.31-11-generic x86_64
dmi.bios.date: 12/21/2007
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: R2110J7
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrR2110J7:bd12/21/2007:svnSonyCorporation:pnVGN-FZ38M:pvrC6008C5H:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VGN-FZ38M
dmi.product.version: C6008C5H
dmi.sys.vendor: Sony Corporation

[kernel-janitor (kernel-janitor)]

[This is an automated message. Apologies if it has reached you inappropriately.]

This bug was reported against the linux-meta package when it likely should have been reported against the linux package instead. We are automatically transitioning this to the linux kernel package so that the appropriate teams are notified and made aware of this issue.

If this bug really is a bug in the linux-meta package you can move it back to linux-meta and set the Status to Confirmed, or contact us on the #ubuntu-kernel channel on the FreeNode IRC server. Thanks.

[Adrian Neagomir (adrian-neagomir)]

I am having exactly the same issue on two computers. Is there another bug opened for this issue?