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[Stephane Lapie <1507764@xxxxxxxxxxxxxxxxxx>]

Sorry, forgot to specify this : the Alt+Tab crash is indeed seemingly random.
At one point after one day or two of running, Alt+Tab will start leaving refresh artifacts (parts of another window that I was browsing while switching) and eventually just outright freeze and crash.

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https://bugs.launchpad.net/bugs/1507764

Title:
  metacity crashed with signal 5 in _XEventsQueued() ; forcing gnome
  session to logout

Status in metacity package in Ubuntu:
  New

Bug description:
  This bug seemed to occur already since earlier versions of Ubuntu, and
  usually would just end up leaving me with undecorated windows, from
  which recovery was as easy as restarting metacity by hand, but in this
  release of Ubuntu (15.04), it seems gnome-session tries to restart it
  too many times in a too short span, and then decides arbitrarily that
  it failed so bad it has to kill the whole session.

  So, while the metacity bug is really a thing, my real problem actually might be a gnome-session-bin bug.
  I expect metacity crashing would not bring down the whole session, as is the case currently.

  At any rate, this is extremely annoying, I am hitting this bug about
  every two days, and because of it and the regression in crash
  handling, I end up losing all my windows and running programs. (In all
  fairness, I am suspecting a hardware issue, but the problem remains
  that a sub process dying should not cause the parent process to die
  like this)

  ProblemType: Crash
  DistroRelease: Ubuntu 15.04
  Package: metacity 1:3.14.3-1ubuntu7
  ProcVersionSignature: Ubuntu 3.19.0-31.36-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-31-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: GNOME-Flashback:Unity
  Date: Tue Oct 20 05:19:37 2015
  ExecutablePath: /usr/bin/metacity
  InstallationDate: Installed on 2010-01-30 (2088 days ago)
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027.1)
  ProcCmdline: metacity
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/zsh
  Signal: 5
  SourcePackage: metacity
  StacktraceTop:
   ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   _XEventsQueued () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   _XGetRequest () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   XFixesCopyRegion () from /usr/lib/x86_64-linux-gnu/libXfixes.so.3
  Title: metacity crashed with signal 5 in _XEventsQueued()
  UpgradeStatus: Upgraded to vivid on 2015-09-05 (44 days ago)
  UserGroups: adm admin audio cdrom dialout libvirtd lpadmin plugdev pulse pulse-access sambashare vboxusers video

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