lightdm crashed with SIGSEGV in check_stopped()

[Lorenzo Villani]

Lightdm crashes on boot on Ubuntu Raring.

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: lightdm 1.4.0-0ubuntu5
ProcVersionSignature: Ubuntu 3.8.0-10.19-generic 3.8.2
Uname: Linux 3.8.0-10-generic x86_64
ApportVersion: 2.9-0ubuntu2
Architecture: amd64
Date: Wed Mar 6 09:12:55 2013
ExecutablePath: /usr/sbin/lightdm
InstallationDate: Installed on 2013-03-03 (2 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130303)
MarkForUpload: True
ProcCmdline: lightdm
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
SegvAnalysis:
 Segfault happened at: 0x410518: mov 0x28(%rax),%ecx
 PC (0x00410518) ok
 source "0x28(%rax)" (0xaaaaaaaaaaaaaad2) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: lightdm
StacktraceTop:
 ?? ()
 ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: lightdm crashed with SIGSEGV in g_signal_emit_valist()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:
 check_stopped (seat=0x25161e0) at seat.c:417
 _g_closure_invoke_va (closure=0x251a340, return_value=0x0, instance=0x251a810, args=0x7fff46d69058, n_params=0, param_types=0x0) at /build/buildd/glib2.0-2.35.8/./gobject/gclosure.c:840
 g_signal_emit_valist (instance=0x251a810, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7fff46d69058) at /build/buildd/glib2.0-2.35.8/./gobject/gsignal.c:3225
 g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.35.8/./gobject/gsignal.c:3370
 _g_closure_invoke_va (closure=0x251a550, return_value=0x0, instance=0x2517100, args=0x7fff46d693f8, n_params=0, param_types=0x0) at /build/buildd/glib2.0-2.35.8/./gobject/gclosure.c:840

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Robert Ancell (robert-ancell)]

Closing assumed fixed.