unity-greeter crashed with SIGSEGV in xkl_config_rec_get_full_from_server()

[Alex Peters]

While typing, the Dash Home appeared. Hitting Esc in an attempt to dismiss the Dash Home caused the screen to go black and the mouse cursor to only move on the screen every few seconds. After hitting Ctrl+Alt+F1 to try to gain access to the console, these messages were observed and looping every five or so seconds, followed by a flash of random colours:

[drm] nouveau 0000:01:00.0: GPU lockup - switching to software fbcon
[drm] nouveau 0000:01:00.0: Failed to idle channel 1.
[drm] nouveau 0000:01:00.0: Failed to idle channel 2.
[drm] nouveau 0000:01:00.0: Failed to idle channel 3.

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: unity-greeter 12.10.4-0ubuntu5
ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
Uname: Linux 3.5.0-21-generic x86_64
ApportVersion: 2.6.1-0ubuntu9
Architecture: amd64
Date: Fri Dec 21 18:03:21 2012
ExecutablePath: /usr/sbin/unity-greeter
InstallationDate: Installed on 2011-05-01 (599 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MarkForUpload: True
ProcCmdline: /usr/sbin/unity-greeter
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/false
SegvAnalysis:
 Segfault happened at: 0x7f01b9036616: mov 0x18(%rdx),%rax
 PC (0x7f01b9036616) ok
 source "0x18(%rdx)" (0x00000018) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity-greeter
StacktraceTop:
 ?? () from /usr/lib/libxklavier.so.16
 lightdm_get_layouts () from /usr/lib/liblightdm-gobject-1.so.0
 ?? ()
 ?? ()
 ?? ()
Title: unity-greeter crashed with SIGSEGV in lightdm_get_layouts()
UpgradeStatus: Upgraded to quantal on 2012-10-21 (60 days ago)
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:
 xkl_config_rec_get_full_from_server (rules_file_out=0x0, data=0x24d0900, engine=0x0) at xklavier_props.c:165
 lightdm_get_layouts () at layout.c:121
 unity_greeter_get_layout_by_name (name=name@entry=0x270fed0 "us") at unity-greeter.c:630
 user_list_user_added_cb (self=0x2706040, user=0x2708100) at user-list.c:4675
 user_list_fill_list (self=0x2706040) at user-list.c:4532