plasma-desktop crashed with SIGSEGV

[poonforce]

Binary package hint: kdebase-workspace

it crashed every time when i tried to add widget on desktop.

ProblemType: Crash
Architecture: amd64
Date: Sun Jan 31 10:38:30 2010
Disassembly: 0x7fbb564aa8d5: Cannot access memory at address 0x7fbb564aa8d5
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/bin/plasma-desktop
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100113)
NonfreeKernelModules: nvidia
Package: plasma-desktop 4:4.3.95-0ubuntu1
ProcCmdline: plasma-desktop --nocrashhandler
ProcEnviron:
 LANGUAGE=
 LANG=en_IN
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-12.16-generic
SegvAnalysis:
 Segfault happened at: 0x7fbb564aa8d5: Cannot access memory at address 0x7fbb564aa8d5
 PC (0x7fbb564aa8d5) ok
 Reason could not be automatically determined.
Signal: 11
SourcePackage: kdebase-workspace
Stacktrace:
 #0 0x00007fbb564aa8d5 in ?? ()
 No symbol table info available.
 Cannot access memory at address 0x7ffffa8e18f8
StacktraceTop: ?? ()
Title: plasma-desktop crashed with SIGSEGV
Uname: Linux 2.6.32-12-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (process:1753): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (polkit-gnome-authentication-agent-1:1799): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (rhythmbox:1751): Rhythmbox-WARNING **: Unable to grab media player keys: Could not get owner of name 'org.gnome.SettingsDaemon': no such name

[Apport retracing service (apport)]

Stacktrace:
 #0 0x00007fbb564aa8d5 in ?? ()
 No symbol table info available.
 Cannot access memory at address 0x7ffffa8e18f8
StacktraceTop: ?? ()
ThreadStacktrace:

[Jonathan Thomas (echidnaman)]

Please install kdebase-workspace-dbg and get a crash log from the KDE crash handler, which should pop up if you run "kquitapp plasma-desktop&& plasma-desktop" from konsole and then crash it again. Also, does this happen with just one widget or with any?