gdmsetup crashed with SIGSEGV in strcmp()

[Andrew O'Brien]

Binary package hint: gdm

On starting Login Screen Set-up from administration menu, configuration window shows with all options greyed out, except for 'unlock' and 'close' for about 1 second before crashing.
If I am quick with Alt-U I can bring up authentication dialogue, but application still crashes.

ProblemType: Crash
Architecture: amd64
CrashCounter: 1
Date: Tue Aug 11 20:37:30 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/gdmsetup
NonfreeKernelModules: nvidia
Package: gdm 2.27.4-0ubuntu9
ProcCmdline: gdmsetup
ProcEnviron:
 PATH=(custom, user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.30-6.7-generic
SegvAnalysis:
 Segfault happened at: 0x7fe15a996d40 <strcmp>: mov (%rdi),%al
 PC (0x7fe15a996d40) ok
 source "(%rdi)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%al" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gdm
StacktraceTop:
 strcmp () from /lib/libc.so.6
 ?? ()
 IA__g_closure_invoke (closure=0x18d7fb0,
 signal_emit_unlocked_R (node=0x1836680,
 IA__g_signal_emit_valist (instance=0x18031a0,
Title: gdmsetup crashed with SIGSEGV in strcmp()
Uname: Linux 2.6.30-6-generic x86_64
UserGroups: adm admin audio cdrom dialout dip floppy fuse lpadmin plugdev sambashare scanner video