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[Stephane Lapie <1507764@xxxxxxxxxxxxxxxxxx>]

I just had again the same crash. :
Dec 30 23:49:59 archer gnome-session[28277]: Window manager warning: Log level 6: The program 'metacity' received an X Window System error.
Dec 30 23:49:59 archer gnome-session[28277]: This probably reflects a bug in the program.
Dec 30 23:49:59 archer gnome-session[28277]: The error was 'BadRegion (invalid Region parameter)'.
Dec 30 23:49:59 archer gnome-session[28277]: (Details: serial 1686054464 error_code 140 request_code 138 (XFIXES) minor_code 12)
Dec 30 23:49:59 archer gnome-session[28277]: (Note to programmers: normally, X errors are reported asynchronously;
Dec 30 23:49:59 archer gnome-session[28277]: that is, you will receive the error a while after causing it.
Dec 30 23:49:59 archer gnome-session[28277]: To debug your program, run it with the GDK_SYNCHRONIZE environment
Dec 30 23:49:59 archer gnome-session[28277]: variable to change this behavior. You can then get a meaningful
Dec 30 23:49:59 archer gnome-session[28277]: backtrace from your debugger if you break on the gdk_x_error() function.)

which led once apport was done writing the crash report :
Dec 30 23:54:51 archer gnome-session[28277]: gnome-session[28277]: WARNING: Application 'metacity.desktop' killed by signal 5
Dec 30 23:54:51 archer gnome-session[28277]: WARNING: Application 'metacity.desktop' killed by signal 5
Dec 30 23:54:51 archer gnome-session[28277]: gnome-session[28277]: WARNING: App 'metacity.desktop' respawning too quickly
Dec 30 23:54:51 archer gnome-session[28277]: WARNING: App 'metacity.desktop' respawning too quickly
Dec 30 23:54:51 archer gnome-session[28277]: Unrecoverable failure in required component metacity.desktop
Dec 30 23:54:51 archer gnome-session[28277]: gnome-session[28277]: CRITICAL: We failed, but the fail whale is dead. Sorry....
Dec 30 23:54:51 archer gnome-session[28277]: CRITICAL: We failed, but the fail whale is dead. Sorry....

>From what I tried, it seems like trying to run "metacity --replace"
before apport finishes killing the old instance does not work : once it
freezes and apport is writing its stuff, the whole session will go down.

Seriously, this regression is infuriating and makes Ubuntu barely usable for me.
I nearly stopped using Alt+Tab out of fear of losing work when switching between gedit and evince.

-- 
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:
  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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