[Bug 1319897] [NEW] gnome-shell crashed with SIGABRT in g_assertion_message()

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This happened on resume from S3 sleep.  It seems related to multi-
monitor support: I had an external display connected via VGA that I
unplugged at around the same time as I suspended the laptop.  The
external display was unplugged when I woke the laptop up.

There was a long pause with a blank screen before gnome-shell crashed
and restarted (I've observed that pause in other gnome-shell crashes
too; maybe it's just apport taking a long time to process the core dump?
dunno).  It then restarted, flashing the picture of my desktop before
restoring the lock screen (this could have privacy/security
implications).

Bug 1190535 might be a duplicate; I can't tell.  The stack trace in that
bug seems mangled.

FWIW the crash was a SIGABRT due to

  assertion failed: (n_outputs == config->n_outputs)

which was visible in the function arguments passed to
g_assertion_message() in the stack trace shown by apport before I
submitted this bug.  I don't trust the retracer bot not to mess up the
stack trace like it usually does for PPA packages.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: gnome-shell 3.12.1-0ubuntu1~trusty1 [origin: LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 3.13.0-26.48-generic 3.13.11
Uname: Linux 3.13.0-26-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CrashCounter: 1
CurrentDesktop: GNOME
Date: Thu May 15 18:18:13 2014
DisplayManager: gdm
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/gnome-shell
GsettingsChanges:
 b'org.gnome.desktop.interface' b'clock-show-seconds' b'true'
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
 b'org.gnome.desktop.interface' b'clock-show-date' b'true'
InstallationDate: Installed on 2012-07-25 (659 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcCmdline: /usr/bin/gnome-shell
Signal: 6
SourcePackage: gnome-shell
Title: gnome-shell crashed with SIGABRT in g_assertion_message()
UpgradeStatus: Upgraded to trusty on 2014-04-18 (27 days ago)
UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare shared sudo wireshark

** Affects: ubuntu-gnome
     Importance: Undecided
         Status: New

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: gnome-shell (Ubuntu Trusty)
     Importance: Undecided
         Status: Confirmed

** Affects: gnome-shell (Ubuntu Utopic)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-crash gnome3-ppa gnome3-staging patch third-party-packages trusty
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gnome-shell crashed with SIGABRT in g_assertion_message()
https://bugs.launchpad.net/bugs/1319897
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