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[Andy Iverson <1097396@xxxxxxxxxxxxxxxxxx>]

I have just run into this bug with a user who has the the stable 3.2
series in 12.04 (32 bit, all updates applied: can't immediately confirm
their kernel version but it is the the 3.2.x).

I am wondering if anyone has any info on if the 3.5 series (package in
precise to provide this: linux-image-generic-lts-quantal) has the same
issue or not?  Reading the other links above, I am not able to
understand if this may be a relatively "safe" update this user can apply
to address the problem.

Otherwise, it seems work is going on for an update to the 3.2 series?

Thanks again to Chris and others here for the work in finding the
problem.  Any help for how to practically (and simply) make a
recommendation to a non-tech user on how to solve the problem ("wait" or
"update to quantal kernel, etc.) would be greatly appreciated.

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https://bugs.launchpad.net/bugs/1097396

Title:
  Unplugging USB Headset causes Kernel Panic

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Precise:
  In Progress
Status in “linux” source package in Raring:
  Fix Released

Bug description:
  SRU Justification:

    Impact: When using a USB audio headset with pulseaudio, if one
  unplugs the headset the kernel will panic.

    Fix: This issue was because of some stable patches that were backported. The problem was shown to Takashi Iwai (upstream alsa), and he created a patch to fix this issue which was then applied to the 3.4 branch of the stable tree. This patch has then been cherry-picked to 3.2 precise. I also requested that this patch be applied to the 3.2 stable branch.
  Here is the link to the commit: http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=commit;h=115b96e58609cff057d22d0e6118dae093763461

    Testcase: Plug in a USB audio headset (ensure pulseaudio is
  working). Unplug it. If the kernel does not panic, then the test
  passes.

  --

  After a recent update which included a new kernel, my machine started
  to panic when I removed my USB headset after our morning stand-ups.

  The headset is a Cyber Acoustics USB headset.

  The crash is pretty easy to reproduce.  Plugin the headset, unplug it,
  panic...

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-35-generic-pae 3.2.0-35.55
  ProcVersionSignature: Ubuntu 3.2.0-35.55-generic-pae 3.2.34
  Uname: Linux 3.2.0-35-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu15.1
  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:  espy       2270 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf2520000 irq 45'
     Mixer name	: 'Intel IbexPeak HDMI'
     Components	: 'HDA:14f15069,17aa21a4,00100302 HDA:80862804,17aa21b5,00100000'
     Controls      : 26
     Simple ctrls  : 8
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 6UHT33WW-1.14'
     Mixer name	: 'ThinkPad EC 6UHT33WW-1.14'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Tue Jan  8 13:39:30 2013
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  MachineType: LENOVO 2901CTO
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-35-generic-pae root=UUID=b154a7ff-6a2a-4dae-804d-0e17319a3cec ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-35-generic-pae N/A
   linux-backports-modules-3.2.0-35-generic-pae  N/A
   linux-firmware                                1.79.1
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: Upgraded to precise on 2012-03-03 (311 days ago)
  dmi.bios.date: 04/25/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6UET69WW (1.49 )
  dmi.board.name: 2901CTO
  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:bvr6UET69WW(1.49):bd04/25/2012:svnLENOVO:pn2901CTO:pvrThinkPadT410s:rvnLENOVO:rn2901CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2901CTO
  dmi.product.version: ThinkPad T410s
  dmi.sys.vendor: LENOVO

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