Update: Now we've had the fix for bug 1746874 released in 18.04 for a
couple of weeks we should be able to see some correlation between gnome-
shell and Xwayland crashes, if there's any at all.

But we don't see any correlation. In the past week, Ubuntu 18.04 has hit
this gnome-shell crash 5967 times (via bug 1748450) and Xwayland's top
crash has only happened 60 times over the same period.

So now we really have to assume that either:
 (a) Xwayland is not crashing at all and gnome-shell is mistaking some 
transient error for a crash; or
 (b) Xwayland is crashing/exiting and failing to dump core, failing to leave a 
crash file.

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Packages, which is subscribed to gnome-shell in Ubuntu.

  gnome-shell crashed with SIGTRAP in x_io_error() from _XIOError() from
  _XEventsQueued() from XPending() from gdk_check_xpending()
  ["Connection to xwayland lost"]

Status in GNOME Shell:
Status in Ubuntu GNOME:
Status in gdm3 package in Ubuntu:
Status in gnome-shell package in Ubuntu:
Status in mutter package in Ubuntu:
Status in gdm3 source package in Artful:
Status in gnome-shell source package in Artful:
Status in mutter source package in Artful:

Bug description:


  Occurred during start-up, before I did anything special...

  1 Ubuntu Wily Werewolf (development branch) 15.10
  2 3.16.3-1ubuntu6
  3&4 not applicable

  ProblemType: Crash
  DistroRelease: Ubuntu 15.10
  Package: gnome-shell 3.16.3-1ubuntu6
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.19.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Mon Oct 12 19:22:07 2015
  DisplayManager: gdm
  ExecutablePath: /usr/bin/gnome-shell

  InstallationDate: Installed on 2015-10-08 (4 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
  ProcCmdline: gnome-shell --mode=gdm --wayland --display-server
   PATH=(custom, no user)
  Signal: 5
  SourcePackage: gnome-shell
   ?? () from /usr/lib/libmutter.so.0
   _XIOError () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   _XEventsQueued () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   XPending () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
  Title: gnome-shell crashed with signal 5 in _XIOError()
  UpgradeStatus: No upgrade log present (probably fresh install)

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