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I'll try again to reproduce, but it seems to be something related to
runaway swap process, (which might arise only when I hit a certain
memory utilisation) and in practice appears to happen after a while of
browsing, loading programs etc. rather than instantaneously whenever
that particular kind of activity is run. I can get away with some
browsing around, a few occasions of successful fullscreen vimeo or
youtube playback, and then I get unlucky and a hang.

I usually have media playing (background audio on headphones when video
isn't playing), but other than that the hosted processes are quite
passive (e.g. multiple instances of evince with open documents and HTML
pages with disabled flash - I disabled flash to run only on click
because of this issue).

Media provides an intense load on top of the existing latent memory and
cpu load from other light-use programs I suppose, which might create the
conditions for some kind of livelock/deadlock/race which is otherwise
luckily avoided by just having more free resources.

Also worth noting that I'm using powertop optimisations hard-coded in
rc.local (nothing I invented myself) to maximise battery life. Hopefully
these aren't related to the issue, but I can attach them if needed. I'm
running the memoryx86 test now, but so far (2 hours in) there's no
errors, so I guess it's not memory-related.

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https://bugs.launchpad.net/bugs/1220821

Title:
  Kernel Panic playing Youtube

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Hi, there.

  Was playing the video at the footer of http://www.instructables.com/id
  /Arduino-controlled-RGB-LED-Infinity-Mirror/?ALLSTEPS within the
  latest version of Google Chrome (at the time of writing) and it caused
  a Kernel Panic (CPU maxed to 100%, fans running hot, unresponsive
  mouse pointer, keyboard, a cycling sound sample from the video and
  CTRL+ALT+F1 was unresponsive).

  After rebooting, Apport offered to file a bug, which then told me it
  had already been reported, and only to comment if I could add extra
  information to the bug. It promptly redirected me to a 404 on
  launchpad, identifying no bug at all.

  Just before the kernel panic, the machine seemed to become
  unresponsive, kswapd0 was using an increasing amount of CPU (even
  though memory was relatively free - about 60% RAM and 30% swap (whilst
  I could still actually observe the stats, and before the slowdown and
  crash).

  Can anyone identify what the bug actually was, since Apport refused to
  file it for its own personal reasons? Since apport is broken, I can't
  access the bug and establish if it is indeed the same bug, or see if
  there are workarounds.

  I'm now running the latest mainline kernel based off
  linux-*-3.11.0-031100-generic_3.11.0-031100.201309021735_i386 (which
  is saucy final if I understand the mainline directories correctly).
  I'll update this bug if the issue recurs with the new mainline (though
  I was getting regular, identical freezes with 3.11 saucy rc6 -  the
  previous kernel I ran.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-4-generic 3.11.0-4.9
  ProcVersionSignature: Ubuntu 3.11.0-4.9-generic 3.11.0-rc7
  Uname: Linux 3.11.0-4-generic i686
  ApportVersion: 2.12.1-0ubuntu3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  cefn      11803 F.... pulseaudio
  Date: Wed Sep  4 17:48:50 2013
  HibernationDevice: RESUME=UUID=4ebb50ee-2d1a-4980-9392-e860a005a618
  InstallationDate: Installed on 2013-08-15 (20 days ago)
  InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Alpha i386 (20130626)
  MachineType: TOSHIBA PORTEGE R600
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-4-generic root=/dev/mapper/ubuntu--gnome--vg-root ro crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-4-generic N/A
   linux-backports-modules-3.11.0-4-generic  N/A
   linux-firmware                            1.113
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/23/2008
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 1.50
  dmi.board.asset.tag: 0000000000
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 0000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: Version 1.0
  dmi.modalias: dmi:bvnTOSHIBA:bvrVersion1.50:bd10/23/2008:svnTOSHIBA:pnPORTEGER600:pvrPPR61E-00Q00CEN:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: PORTEGE R600
  dmi.product.version: PPR61E-00Q00CEN
  dmi.sys.vendor: TOSHIBA

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