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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** This bug is no longer a duplicate of bug 1518457
   kswapd0 100% CPU usage

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https://bugs.launchpad.net/bugs/689262

Title:
  System hang under high load - kswapd

Status in linux package in Ubuntu:
  Expired

Bug description:
  I get reproducible system hangs within minutes, apparently under high
  load. There's no message left in the logs or under X, sound plays
  repeatedly the same 1-2 seconds of music, and the computer doesn't
  respond anymore (not even to short pressing the power button, which
  normally triggers a clean shutdown), but I got the following displayed
  in a text console, as I was trying to perform a backup there with
  rdiff-backup:

  BUG: soft lockup - CPU#0 stuck for 61s! (kswapd0: 26)
  Process kswapd0 (pid: 26, ti=f7214000 task=f713bf70 task.ti=f7214000)
  Stack:
  Call trace:
  Code: c1 fa 66 66 90 66 90 89 c8 e8 68 36 b6 ff 90 5b 5d c3 8d 74 26 00 55 89 e5 53 0f 1f 44 00 00 89 d3 e8 90 36 b6 ff 90 89 d8 50 9d <66> 66 66 90 5b 5d c3 8d 74 26 00 55 89 e5 0f 1f 44 00 00 ba ff

  The message repeats roughly every minute, just the "Code:" part being
  different, but the computer doesn't answer in any way whatsoever. This
  is relatively easy reproducible: start music (from Internet radio in
  Rhythmbox), load a flash video in Firefox, then switch to a console
  and do a "find . -type f -exec cat {} > /dev/null \;" (this makes it
  happen immediately - normal usage with Firefox, Rhytmbox, Evolution
  and PDF viewing in Evince or loading an OpenOffice Writer document
  also make it hang within maybe 10 minutes, without disk-intensive
  operations like find or rdiff-backup).

  I can reproduce this behavior with both 2.6.35-23 from Ubuntu 10.10
  and 2.6.35-24 from proposed-updates. I also tried 2.6.35.9 from
  mainline, but the WiFi USB stick doesn't work with that version, and I
  could only do "find", which didn't trigger the hang (couldn't really
  generate high loads without a network connection). However, by booting
  with 2.6.32 (leftover after upgrading from 10.04, I guess), I have an
  absolutely stable system: I can't get it to hang, no matter what I do
  (not even a single hang, despite testing for almost a week under high
  load, including the steps mentioned before).

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: linux-image-2.6.35-24-generic 2.6.35-24.42
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
  Uname: Linux 2.6.35-24-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  meike      1813 F.... pulseaudio
   /dev/snd/controlC1:  meike      1813 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'IXP'/'ATI IXP rev 2 with ALC655 at 0xfe029000, irq 17'
     Mixer name	: 'Realtek ALC655 rev 0'
     Components	: 'AC97a:414c4760'
     Controls      : 41
     Simple ctrls  : 26
  Card1.Amixer.info:
   Card hw:1 'Device'/'USB VoIP Device at usb-0000:00:13.2-3.2, full speed'
     Mixer name	: 'USB Mixer'
     Components	: 'USB05e1:2010'
     Controls      : 4
     Simple ctrls  : 2
  Date: Sun Dec 12 14:06:52 2010
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=eb6f761a-06fa-459b-bf01-8554b84d0cc1
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-24-generic root=UUID=d69674a5-188d-445d-a4e8-6e779690f937 ro quiet splash
  ProcEnviron:
   LANG=en_US.utf8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.38
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  dmi.bios.date: 02/13/2006
  dmi.bios.vendor: Phoenix Technologies, LTD
  dmi.bios.version: 6.00 PG
  dmi.board.name: RS482-M
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd02/13/2006:svn:pn:pvr:rvn:rnRS482-M:rvr:cvn:ct3:cvr:

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