lightdm crashed with SIGSEGV in child_process_signal()

[C de-Avillez]

Logged out and in again. Nothing unique.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: lightdm 0.4.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.0-3.4-generic 3.0.0-rc5
Uname: Linux 3.0-3-generic x86_64
NonfreeKernelModules: wl nvidia
Architecture: amd64
Date: Tue Jul 5 10:41:15 2011
ExecutablePath: /usr/bin/lightdm
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110228)
ProcCmdline: lightdm
ProcEnviron: PATH=(custom, no user)
SegvAnalysis:
 Segfault happened at: 0x406b20 <child_process_signal+32>: mov 0x2c(%rax),%r8d
 PC (0x00406b20) ok
 source "0x2c(%rax)" (0xaaaaaaaaaaaaaad6) not located in a known VMA region (needed readable region)!
 destination "%r8d" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: lightdm
StacktraceTop:
 child_process_signal (process=0x1633ae0, signum=15) at child-process.c:357
 quit_greeter_cb (data=0x1633ae0) at greeter.c:394
 g_timeout_dispatch (source=0x7f649c00e920, callback=<value optimized out>, user_data=<value optimized out>) at /build/buildd/glib2.0-2.29.8/./glib/gmain.c:3955
 g_main_dispatch (context=0x162dd20) at /build/buildd/glib2.0-2.29.8/./glib/gmain.c:2477
 g_main_context_dispatch (context=0x162dd20) at /build/buildd/glib2.0-2.29.8/./glib/gmain.c:3050
Title: lightdm crashed with SIGSEGV in child_process_signal()
UpgradeStatus: Upgraded to oneiric on 2011-06-27 (8 days ago)
UserGroups:

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #798716, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.