gnome-session crashed with SIGSEGV in SmsDie()

I was running 'system update' and first got severe kernel problem which I reported and decided already being investigated. When I returned to the update I found this problem and error report request.

ProblemType: Crash
Architecture: amd64
Date: Sat Sep 5 19:45:43 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/gnome-session
NonfreeKernelModules: nvidia
Package: gnome-session-bin 2.27.92-0ubuntu1
ProcCmdline: gnome-session
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-10.32-generic
SegvAnalysis:
 Segfault happened at: 0x7febf0fae791 <SmsDie+1>: mov 0x8(%rdi),%rbx
 PC (0x7febf0fae791) ok
 source "0x8(%rdi)" (0x00000008) not located in a known VMA region (needed readable region)!
 destination "%rbx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-session
StacktraceTop:
 SmsDie () from /usr/lib/libSM.so.6
 ?? ()
 ?? ()
 g_mkdir_with_parents ()
 ?? ()
Title: gnome-session crashed with SIGSEGV in SmsDie()
Uname: Linux 2.6.31-10-generic x86_64
UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev sambashare tape vboxusers video