[Bug 665796] Re: Timer interrupt freezes, system becomes sluggish

[JRavasi]

** Description changed:

  Since upgrading to Maverick, I'm frequently observing instances of the
  timer interrupts suddenly stopping being processed (or even produced?)
  for a few minutes. The system becomes sluggish as a whole, all CPU cores
  go high on Sys% usage. This continues for 3-5 minutes, then suddenly
  goes back to normal, just like how it started.
  
  It is certainly related to the timer interrupt: If I continuously 'cat
  /proc/interrupts' (or just run it under 'watch') during the time the
  system is affected, interrupt 0 (IR-IO-APIC-edge timer) stays frozen
  until the problem goes away. No messages appear on dmesg or in
  /var/log/kern.log.
  
  The problem always starts at random, with no particular cause, but it
  seems more frequent when making heavy use of both sound and graphics at
  the same time. It is very common to happen when I start playing some
  game on Wine. It seems to also vanish at random after 3-5 minutes have
  passed, but zapping the X server seems to a way to restore the normal
  behaviour (it happened twice until now, I need more tests to confirm).
  
  The system is:
-   Processor: Intel Core i7 930 (2.8 GHz, 4 cores × 2 threads)
-   Mainboard: Intel DX58SO Extreme
-   Memory: 6 GiB
-   Storage: 3 × 1 TB Samsung HardDisks on a RAID 5 array, LVM on top.
+   Processor: Intel Core i7 930 (2.8 GHz, 4 cores × 2 threads)
+   Mainboard: Intel DX58SO Extreme
+   Memory: 6 GiB
+   Storage: 3 × 1 TB Samsung HardDisks on a RAID 5 array, LVM on top.
+   Video: nVidia GTX 460 (with proprietary drivers)
  
  I don't know what more I can say about this issue, but feel free to ask;
  I'm willing to provide as much information as possible to have this
  fixed.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: linux-image-2.6.35-22-generic 2.6.35-22.35
  Regression: Yes
  Reproducible: No
  ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
  Uname: Linux 2.6.35-22-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  juliano    2781 F.... kmix
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf0000000 irq 22'
     Mixer name	: 'Realtek ALC889'
     Components	: 'HDA:10ec0889,80860022,00100004'
     Controls      : 42
     Simple ctrls  : 24
  Date: Sun Oct 24 04:25:13 2010
  Frequency: I don't know.
  HibernationDevice: RESUME=UUID=4f433bf6-748e-432d-b93f-de4d0e693b91
  InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101008)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=/dev/mapper/Nagisa1-Root ro rootdelay=5
  ProcEnviron:
   LANGUAGE=
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/zsh
  RelatedPackageVersions: linux-firmware 1.38
  RfKill:
  
  SourcePackage: linux
  UserAsoundrc:
   #pcm.!default plug:hw:0
   #ctl.!default hw:0
  dmi.bios.date: 08/30/2010
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: SOX5810J.86A.5456.2010.0830.0013
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: DX58SO
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE29331-703
  dmi.chassis.type: 2
  dmi.modalias: dmi:bvnIntelCorp.:bvrSOX5810J.86A.5456.2010.0830.0013:bd08/30/2010:svn:pn:pvr:rvnIntelCorporation:rnDX58SO:rvrAAE29331-703:cvn:ct2:cvr:

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Timer interrupt freezes, system becomes sluggish
https://bugs.launchpad.net/bugs/665796
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