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[John Drinkwater <john@xxxxxxxxxxxxx>]

Subbing to this bug even though the direct cause is not the same; with metacity crashing now, my entire session is being lost!
I’ve been able to trigger it while alt-tabbing like the OP, closing windows, and generally interacting with the window manager while a 3d game is open or VLC has been in use has caused it.
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1535906

It was occuring on 15.04 and updating to 15.10 did not resolve the
issue.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to metacity in Ubuntu.
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:
  Confirmed

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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