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[Bug 1019574] Re: 0471:0311 BUG: unable to handle kernel NULL pointer dereference at 0000000000000050; RIP: 0010:[<ffffffffa0112d6e>] [<ffffffffa0112d6e>] v4l2_ctrl_s_ctrl+0xe/0x50 [videodev]


[Expired for linux (Ubuntu) because there has been no activity for 60

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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  0471:0311 BUG: unable to handle kernel NULL pointer dereference at
  0000000000000050; RIP: 0010:[<ffffffffa0112d6e>] [<ffffffffa0112d6e>]
  v4l2_ctrl_s_ctrl+0xe/0x50 [videodev]

Status in “linux” package in Ubuntu:

Bug description:
  Since Ubuntu 12.04,

  I get a kernel oops when trying to use the Toucam Pro 2 Philips USB
  webcam with Qastrocam-g2 (not part of Ubuntu repos) an astronomy
  program that use advanced functions of Philips webcam. Basic usage of
  the webcam with cheese is still possible.

  It used to work well before.

  On AMD64x2 desktop/Ubuntu 12.04 Desktop x86-64, I installed:
  - libqwtplot3d-qt3-0_0.2.7+svn191-4_amd64.deb (http://pkgs.org/debian-sid)
  - qastrocam-g2_4.8_amd64.deb (sourceforge)
  I plug in the Philips Toucam Pro 2 USB webcam.
  I run qastrocam-g2, configure it to use the V4L2 device associated with the Philips Toucam Pro 2 USB webcam in the setting tabs and restart the program. I get a oops and the system hangs.

  Maybe this is the fix (?):

  UNAME A for AMD64x2 desktop
  Linux saturn 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

  I have tested the latest mainline kernel packaged for precise:

  Note that this package is dated 06-May-2012 and this git commit
  is from 09-May-2012, so this kernel doesn't contain the latest fix(es)
  on the PWC driver.

  With this kernel, I don't get a OOPS with qastrocam-g2 and qastrocam-g2 can acquire pictures from the Toucam Pro 2.
  However, most IOCTL commands used by qastrocam-g2 to set camera parameters such as the gain are not recognized (see attached console output). This was not the case in older version of Ubuntu such as 11.10. Interestingly the file drivers/media/video/pwc/pwc-ioctl.h was removed after kernel 3.0 ( http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git&a=search&h=HEAD&st=commit&s=pwc-ioctl ) because it was redundant? with include/media/pwc-ioctl.h.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-24-generic 3.2.0-24.39
  ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
  Uname: Linux 3.2.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: amd64
   /dev/snd/controlC2:  astro      2096 F.... pulseaudio
   /dev/snd/controlC0:  astro      2096 F.... pulseaudio
   /dev/snd/controlC1:  astro      2096 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
   Card hw:0 'NVidia'/'HDA NVidia at 0xfe020000 irq 20'
     Mixer name	: 'Realtek ALC883'
     Components	: 'HDA:10ec0883,147b8e01,00100002'
     Controls      : 48
     Simple ctrls  : 23
   Card hw:1 'CX8811'/'Conexant CX8811 at 0xfa000000'
     Mixer name	: 'CX88'
     Components	: ''
     Controls      : 4
     Simple ctrls  : 3
   Card hw:2 'U0x4710x311'/'USB Device 0x471:0x311 at usb-0000:00:02.1-2.2, full speed'
     Mixer name	: 'USB Mixer'
     Components	: 'USB0471:0311'
     Controls      : 2
     Simple ctrls  : 1
   Simple mixer control 'Mic',0
     Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
     Capture channels: Mono
     Limits: Capture 0 - 3
     Mono: Capture 1 [33%] [40.00dB] [on]
  Date: Thu Jun  7 13:21:09 2012
  HibernationDevice: RESUME=UUID=7b300250-5947-480e-ae81-cbd4ae320b01
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
   lo        no wireless extensions.

   eth1      no wireless extensions.

   eth0      no wireless extensions.
   PATH=(custom, no user)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic root=UUID=bb81248b-bffa-45bc-b89f-17801018eb28 ro quiet splash vt.handoff=7
   linux-restricted-modules-3.2.0-24-generic N/A
   linux-backports-modules-3.2.0-24-generic  N/A
   linux-firmware                            1.79

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/13/2006
  dmi.bios.vendor: Phoenix Technologies, LTD
  dmi.bios.version: 6.00 PG
  dmi.board.name: KN9(NF-MCP55 series)
  dmi.board.vendor: http://www.abit.com.tw/
  dmi.board.version: 1.x
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd07/13/2006:svn:pn:pvr:rvnhttp//www.abit.com.tw/:rnKN9(NF-MCP55series):rvr1.x:cvn:ct3:cvr:

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