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[Stephane Lapie <1507764@xxxxxxxxxxxxxxxxxx>]

It's hard to reproduce "at will". I personally run Firefox, Thunderbird,
Chrome, gedit, gjiten, skype, pidgin, Gnome Terminal, and always have
something like 20 windows open at a time on my main workspace.

Of note :
- When alt tabbing between windows, sometimes surfaces flash to black for one instant before redraw happens.
This might indicate that the core problem with metacity crashing in the first place is linked to Xorg or the nvidia driver ?
- Also, with previous versions of Ubuntu, I did have metacity crash on me at times, but the session would keep on running, so I could relaunch metacity from an open terminal (or via console using : DISPLAY=:0.0 metacity ) ; The crash itself is not a problem, gnome-sessions's extremely poor handling of it is.

The easiest way for me to produce this crash is to edit text in gedit,
open a PDF in evince, and spend my time alt tabbing between them (which
happens quite a lot as I am doing translation work). At one point, I'll
start seeing redrawing artifacts (to explain : even though I switched
applications, the display still shows a black surface, or the
application which was on top of gedit at that time, and I have to
interact with the application for redraw to occur.

When I see this symptom, I know that within the next 50~100 window
switchings, I will crash.

The crash can even be triggered by clicking the window tab on the
application bar.

-- 
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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