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[Daniel Arnitz <daniel.arnitz@xxxxxxxx>]

Christopher Penalver, thank you for the clarification. I followed your
instructions. Unfortunately, /var/crash is empty after the crashes.

The secondary kernel for linux-crashdump is loaded; cat
/sys/kernel/kexec_crash_loaded returns 1. A test crash using echo c |
sudo tee /proc/sysrq-trigger has the same symptoms as the actual oops ,
i.e., a completely unresponsive system. The system does not reboot after
the test crash and /var/crash is also empty. I've waited for 90 minutes
before forcing the reboot by turning off power.

The memory is OK (test passed), and the crash is reproducible on a text
console. As far as I can tell, the kernel logs are clean.

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https://bugs.launchpad.net/bugs/1228109

Title:
  [Lenovo ThinkCentre M91p] System freezes

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  * Problem description: The system freezes completely. This includes
  screen, mouse, and keyboard including numlock light. Even after
  several weeks of testing I was not able to tie the freezes to a
  specific event, program, or behavior. There seem to be a few scenarios
  where freezes are more likely (see below), but they can essentially
  occur at any time. I have updated my bios and the system; this did not
  solve the problem. I have not yet tried the mainline kernel, since I
  am unsure which version to select.

  * Steps to reproduce: Run long-term measurement device remote control in Matlab (data collection; SCPI, low cpu load, some network, a couple GB RAM usage). The system typically freezes within 24 to 48 hours. I have also tried several other scenarios:
  - normal work with KDE (Kile, Thunderbird, Firefox, Inkscape, VLC, Dolphin): RARELY (~ once a month)
  - measurement device remote control in Matlab (memory, network).

  The following didn't seem to reproduce the problem:
  - running date + sleep in a bash loop.
  - running date + sleep in a bash loop within screen.
  - running ping constantly.
  - idle loop in Matlab (do nothing).
  - random data copying loop in Matlab (memory only).

  * Keeping CPU load high by inverting a some matrix in the data
  collection loop seems to prevent this problem.

  * Last working version: Kubuntu 11.10

  * Additional information:
  - memory test came back negative (no problems)
  - crash is reproducible on a text console
  - could not obtain trace dump (system does not react to keyboard)

  Neither of the following fixed the problem:
  xserver-xorg-lts-quantal libgl1-mesa-dri-lts-quantal:i386 libgl1-mesa-glx-lts-quantal:i386

  or fixing the "*BAD*gran_size" issue described in:
  http://my-fuzzy-logic.de/blog/index.php?/archives/41-Solving-linux-MTRR-problems.html

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.5.0-40-generic 3.5.0-40.62~precise1
  ProcVersionSignature: Ubuntu 3.5.0-40.62~precise1-generic 3.5.7.20
  Uname: Linux 3.5.0-40-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
  ApportVersion: 2.0.1-0ubuntu17.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  arnitz     2208 F.... pulseaudio
   /dev/snd/controlC0:  arnitz     2208 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xfe520000 irq 44'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0662,17aa3070,00100101 HDA:80862805,17aa3070,00100000'
     Controls      : 36
     Simple ctrls  : 16
  Card1.Amixer.info:
   Card hw:1 'Audio'/'Plantronics Wireless Audio Plantronics Wireless Audio at usb-0000:00:1d.0-1.4, '
     Mixer name	: 'USB Mixer'
     Components	: 'USB047f:d955'
     Controls      : 4
     Simple ctrls  : 2
  Date: Fri Sep 20 08:13:34 2013
  HibernationDevice: RESUME=UUID=2f562564-0248-4280-a46b-9cd0f0e8e5e6
  InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  IwConfig:
   eth0      no wireless extensions.

   eth1      no wireless extensions.

   lo        no wireless extensions.
  MachineType: LENOVO 4524-AN4
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-40-generic root=UUID=af77f384-9007-4d2b-8395-5ada0dcfb93e ro quiet splash enable_mtrr_cleanup mtrr_spare_reg_nr=1 mtrr_gran_size=64K mtrr_chunk_size=256M vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-40-generic N/A
   linux-backports-modules-3.5.0-40-generic  N/A
   linux-firmware                            1.79.6
  RfKill:

  SourcePackage: linux
  UpgradeStatus: Upgraded to precise on 2013-06-20 (91 days ago)
  dmi.bios.date: 10/16/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 9HKT54AUS
  dmi.board.vendor: LENOVO
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnLENOVO:bvr9HKT54AUS:bd10/16/2012:svnLENOVO:pn4524-AN4:pvrThinkCentreM91p:rvnLENOVO:rn:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: 4524-AN4
  dmi.product.version: ThinkCentre M91p
  dmi.sys.vendor: LENOVO

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