[Bug 577934] [NEW] kernel 2.6.32-22 crashes with BUG fs-writeback.c at system shutdown/reboot only after using wireless adapter

[woawa]

Public bug reported:

After upgrading to Kubuntu 10.04 (from 9.10) I can no longer properly shut down my laptop ONLY after I have used my wireless network interface.
Using the ethernet cable (while still having the NetworkManager applet showing the wireless networks) and shutting down the system thereafter works fine.   This is 
Linux jabbok 2.6.32-22-generic #33-Ubuntu SMP Wed Apr 28 13:28:05 UTC 2010 x86_64 GNU/Linux
on a Lenovo Z61p (9452W5P).

After muting the grub2 splash screens, I was able to see a kernel error message on the display when the laptop freezes:
....
kernel BUG at /build/buildd/linux-2.6.32/fs/fs-writeback.c 157!
invalid opcod: 0000 [#1] SMP
last sysfs file: /sys/devices/virtual/sound/timer/uevent
CPU1
...

Unfortunately, the syslog writing process seems to be no longer active
at the point of the crash so that I cannot find any indication in there.
[I had to jot down the kernel messages above from the screen and type
them in again.]

After an unclean shutdown (pressing the power button) all user desktop
configurations are lost. (Icons in panel, background image, etc.)

Steps to reproduce the kernel panic:
- boot the system (after a clean shutdown)
- login as user
- use knetworkmanager applet to start (known) wireless WPA2 secured network connection
  [type kwallet password into box opening up]
- once connected, shut down system via Leave -> shutdown
  This will freeze the laptop during shutdown.

The same will happen during the shutdown steps if I request a reboot.

However, all of this doesn't happen if I connect an ethernet cable for
my network connection.  The system shuts down properly, even though
wirless is enabled in knetworkmanager and my home network is shown in
the list of available wireless networks (being inactive though).  It
used to work fine with Kubuntu 9.10 previously.

Thanks for having a look at it.  Please let me know if you require
additional information for debugging this issue.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-22-generic 2.6.32-22.33
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic x86_64
NonfreeKernelModules: openafs hsfengine
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  walkowia   2037 F.... knotify4
                      walkowia   2061 F.... pulseaudio
                      walkowia   2082 F.... kmix
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xee400000 irq 17'
   Mixer name	: 'Analog Devices AD1981'
   Components	: 'HDA:11d41981,17aa2060,00100200'
   Controls      : 21
   Simple ctrls  : 12
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7FHT26WW-1.08'
   Mixer name	: 'ThinkPad EC 7FHT26WW-1.08'
   Components	: ''
   Controls      : 2
   Simple ctrls  : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
   Playback channels: Mono
   Limits: Playback 0 - 14
   Mono: Playback 3 [21%] [off]
Date: Sun May  9 20:11:19 2010
HibernationDevice: RESUME=UUID=257329d3-ed72-4e2c-91d4-6e19e6448440
MachineType: LENOVO 9452W5P
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-22-generic root=UUID=337febf4-3985-42c3-b533-e1a8747b8660 ro
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/usr/bin/tcsh
RelatedPackageVersions: linux-firmware 1.34
SourcePackage: linux
WpaSupplicantLog:
 
dmi.bios.date: 06/03/2008
dmi.bios.vendor: LENOVO
dmi.bios.version: 7FETA7WW (2.25 )
dmi.board.name: 9452W5P
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7FETA7WW(2.25):bd06/03/2008:svnLENOVO:pn9452W5P:pvrThinkPadZ61p:rvnLENOVO:rn9452W5P:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 9452W5P
dmi.product.version: ThinkPad Z61p
dmi.sys.vendor: LENOVO

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


** Tags: amd64 apport-bug lucid needs-upstream-testing networking regression-potential

-- 
kernel 2.6.32-22 crashes with BUG fs-writeback.c at system shutdown/reboot only after using wireless adapter
https://bugs.launchpad.net/bugs/577934
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