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. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1220821/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
