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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Precise)
       Status: In Progress => Fix Committed

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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:
  Fix Committed
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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