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[Launchpad Bug Tracker <1638153@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package metacity - 1:3.20.3-1ubuntu2.1

---------------
metacity (1:3.20.3-1ubuntu2.1) yakkety; urgency=medium

  * Update no_remove_on_unmap.diff with a minor fix from upstream.
  * Backport upstream patch to fix crash in meta_group_new() function
    (group_error_trap.diff, LP: #1638153).

 -- Dmitry Shachnev <mitya57@xxxxxxxxxx>  Wed, 09 Nov 2016 22:51:48
+0300

** Changed in: metacity (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1638153

Title:
  metacity crashed with signal 5 in XGetWindowAttributes()

Status in metacity package in Ubuntu:
  Fix Released
Status in metacity source package in Xenial:
  New
Status in metacity source package in Yakkety:
  Fix Released

Bug description:
  # Impact
  Metacity crashes sometimes, which can lead to the session being aborted and can cause loss of unsaved work results.

  # Test Case
  The quickest way to reproduce is to open up an image in Gimp, select all, copy and then exit. That's when Metacity crashes.

  It also crashes in other applications, like Netbeans.

  # Fix
  The proposed upload for Yakkety is identical to 1:3.20.3-1ubuntu3, which has been in Zesty for some time. The fix comes from upstream gnome-3-20 branch.

  # Regression Potential
  The fix has been staged in Zesty, and nobody complained.

  =============================================================================

  This began when I upgraded to 16.10, it always happens when using Gimp
  under Gnome-flashback. Occasionally it happens with other apps too.

  The bad part is, if I don't run 'metacity --replace' before launching
  gimp, it causes the entire session to quit and go back to the login
  screen. (I know why it does that, but there should be some better
  error handling there so people don't lose their work or any other in
  progress things, at least with just metactity crashed there's a way of
  restarting metacity and keeping the current session, as well as the
  ability to save work in other applications before restarting)

  Ubuntu 16.10
  Metacity 1:3.20.3-1ubuntu2

  ProblemType: Crash
  DistroRelease: Ubuntu 16.10
  Package: metacity 1:3.20.3-1ubuntu2
  ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0
  Uname: Linux 4.8.0-26-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CurrentDesktop: GNOME-Flashback:Unity
  Date: Mon Oct 31 21:57:27 2016
  ExecutablePath: /usr/bin/metacity
  ExecutableTimestamp: 1475585823
  InstallationDate: Installed on 2010-12-09 (2154 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  ProcCmdline: metacity --replace
  ProcCwd: /home/kyle
  Signal: 5
  SourcePackage: metacity
  StacktraceTop:
   XGetWindowAttributes (dpy=0x556f34ceed40, w=<optimized out>, attr=attr@entry=0x7ffca3678490) at ../../src/GetWAttrs.c:149
   meta_group_new (display=0x556f34f66c00, group_leader=<optimized out>) at core/group.c:48
   meta_window_compute_group (window=window@entry=0x556f351a8eb0) at core/group.c:159
   meta_window_group_leader_changed (window=window@entry=0x556f351a8eb0) at core/group.c:194
   reload_wm_hints (window=0x556f351a8eb0, value=<optimized out>, initial=<optimized out>) at core/window-props.c:1565
  Title: metacity crashed with signal 5 in XGetWindowAttributes()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip disk fax floppy fuse lpadmin netdev plugdev powerdev sambashare scanner sudo tape vboxusers video wireshark

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