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[Romain Thouvenin <romain.thouvenin@xxxxxxxxx>]

The problem seems more serious than I thought, my system froze again while displaying a Stackoverflow.com page and another time while a Google search page was being dynamically updated (while typing in the search field).
So while it is 100% reproducible on Facebook, it looks more sporadic on other sites.

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https://bugs.launchpad.net/bugs/1567324

Title:
  System crashes when opening Facebook on Firefox

Status in linux-lts-utopic package in Ubuntu:
  New

Bug description:
  I am flagging this as a linux bug because it occurs after an update of
  the kernel, but this could as well be a Firefox issue.

  Yesterday (2016-04-06), as part of the regular package updates, the kernel was updated to version 3.16.0-69. Since then, when I open Facebook on Firefox the system crashes abruptly after a couple of seconds. Everything freezes, the system does not react to mouse or keyboard inputs, and the only thing I can do is force-reboot the computer. 
  The problem occurs consistently with Facebook. It also occured on another website (pluralsight.com), but I was not able to reproduce. The only common point between those two websites I can see, as opposed to other websites where there is no problem, is that they consume a lot of resources. I will add other sites here if I find any.
  The problem does not occur when opening Facebook from Chromium.

  Please find below an extract of apt/history.log showing the updated
  packages:

  Start-Date: 2016-04-06  10:28:00
  Commandline: aptdaemon role='role-commit-packages' sender=':1.55'
  Install: linux-image-extra-3.16.0-69-generic:amd64 (3.16.0-69.89~14.04.1), linux-headers-3.13.0-85-generic:amd64 (3.13.0-85.129), linux-headers-3.16.0-69:amd64 (3.16.0-69.89~14.04.1), linux-headers-3.13.0-85:amd64 (3.13.0-85.129), linux-image-3.16.0-69-generic:amd64 (3.16.0-69.89~14.04.1), linux-headers-3.16.0-69-generic:amd64 (3.16.0-69.89~14.04.1)
  Upgrade: linux-headers-generic:amd64 (3.13.0.83.89, 3.13.0.85.91), linux-image-generic-lts-utopic:amd64 (3.16.0.67.58, 3.16.0.69.60), linux-generic-lts-utopic:amd64 (3.16.0.67.58, 3.16.0.69.60), linux-libc-dev:amd64 (3.13.0-83.127, 3.13.0-85.129), linux-headers-generic-lts-utopic:amd64 (3.16.0.67.58, 3.16.0.69.60)
  End-Date: 2016-04-06  10:30:57

  
  I am attaching an extract of /var/log/kern.log that contains some data logged when the crash happened. It seems to be binary data as the less command just shows a sequence of "^@" characters. The line before is not related I think, as it was already present before the crash. The line after is the reboot starting. I hope the text editor did not alter the binary data when saving the file, if it did please let me know a way of extracting the data.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-69-generic 3.16.0-69.89~14.04.1
  ProcVersionSignature: Ubuntu 3.16.0-69.89~14.04.1-generic 3.16.7-ckt25
  Uname: Linux 3.16.0-69-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: LXDE
  Date: Thu Apr  7 11:21:52 2016
  InstallationDate: Installed on 2015-03-30 (373 days ago)
  InstallationMedia: Lubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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