Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2))
Qt Version: 4.5.0
Operating System: Linux 2.6.28-11-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
My system tray and start menu disappeared. Restart was succesfull, but it crashes more than once. Compiz is running with serveral effects.

 -- Backtrace:
Application: Plasma Workspace (kdeinit), signal: Segmentation fault
[Current thread is 0 (LWP 3563)]

Thread 2 (Thread 0x7f75f544c950 (LWP 3644)):
#0  0x00007f7610fde2e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f7615159939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007f7613fd64cc in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007f7615158952 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007f7610fda3ba in start_thread () from /lib/libpthread.so.0
#5  0x00007f7611bbefcd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f7615723750 (LWP 3563)):
[KCrash Handler]
#5  0x00007f7611b59c40 in strlen () from /lib/libc.so.6
#6  0x00007f761524a318 in QMetaObject::invokeMethod () from /usr/lib/libQtCore.so.4
#7  0x00007f760caea033 in Plasma::Animator::timerEvent () from /usr/lib/libplasma.so.3
#8  0x00007f76152514d3 in QObject::event () from /usr/lib/libQtCore.so.4
#9  0x00007f76127cb78d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#10 0x00007f76127d397a in QApplication::notify () from /usr/lib/libQtGui.so.4
#11 0x00007f761390e06b in KApplication::notify () from /usr/lib/libkdeui.so.5
#12 0x00007f761524175c in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#13 0x00007f761526e7f6 in ?? () from /usr/lib/libQtCore.so.4
#14 0x00007f761526af0d in ?? () from /usr/lib/libQtCore.so.4
#15 0x00007f761122920a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#16 0x00007f761122c8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#17 0x00007f761122ca7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#18 0x00007f761526ae6f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#19 0x00007f7612863bef in ?? () from /usr/lib/libQtGui.so.4
#20 0x00007f7615240002 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#21 0x00007f76152403cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#22 0x00007f7615242694 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#23 0x00007f76091197eb in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#24 0x000000000040714e in _start ()

Reported using DrKonqi