Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
crash happened immediately, plasma relaunched and continued normally.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 4811)]

Thread 2 (Thread 0x7fff29ce6950 (LWP 4812)):
#0  0x00007fff459372e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fff49a3ad19 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007fff488c481c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007fff49a39d35 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fff459333ba in start_thread () from /lib/libpthread.so.0
#5  0x00007fff46517fcd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fff49ff9750 (LWP 4811)):
[KCrash Handler]
#5  0x00007fff4768dad4 in QGraphicsItem::isWidget () from /usr/lib/libQtGui.so.4
#6  0x00007fff47690279 in QGraphicsItem::isWindow () from /usr/lib/libQtGui.so.4
#7  0x00007fff476c6df1 in QGraphicsScene::event () from /usr/lib/libQtGui.so.4
#8  0x00007fff470eef4d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#9  0x00007fff470f718a in QApplication::notify () from /usr/lib/libQtGui.so.4
#10 0x00007fff4820171b in KApplication::notify () from /usr/lib/libkdeui.so.5
#11 0x00007fff49b236ac in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#12 0x00007fff476d73d6 in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#13 0x00007fff49b229b8 in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#14 0x00007fff470eef1c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#15 0x00007fff470f718a in QApplication::notify () from /usr/lib/libQtGui.so.4
#16 0x00007fff4820171b in KApplication::notify () from /usr/lib/libkdeui.so.5
#17 0x00007fff49b236ac in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#18 0x00007fff4714022a in QWidget::event () from /usr/lib/libQtGui.so.4
#19 0x00007fff474b2f0b in QFrame::event () from /usr/lib/libQtGui.so.4
#20 0x00007fff47544639 in QAbstractScrollArea::event () from /usr/lib/libQtGui.so.4
#21 0x00007fff470eef4d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#22 0x00007fff470f718a in QApplication::notify () from /usr/lib/libQtGui.so.4
#23 0x00007fff4820171b in KApplication::notify () from /usr/lib/libkdeui.so.5
#24 0x00007fff49b236ac in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#25 0x00007fff4714022a in QWidget::event () from /usr/lib/libQtGui.so.4
#26 0x00007fff41476d30 in Plasma::Dialog::event () from /usr/lib/libplasma.so.3
#27 0x00007fff470eef4d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#28 0x00007fff470f718a in QApplication::notify () from /usr/lib/libQtGui.so.4
#29 0x00007fff4820171b in KApplication::notify () from /usr/lib/libkdeui.so.5
#30 0x00007fff49b236ac in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#31 0x00007fff470f5cb8 in QApplication::setActiveWindow () from /usr/lib/libQtGui.so.4
#32 0x00007fff4715f5c0 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#33 0x00007fff47188454 in ?? () from /usr/lib/libQtGui.so.4
#34 0x00007fff45b8220a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0x00007fff45b858e0 in ?? () from /usr/lib/libglib-2.0.so.0
#36 0x00007fff45b85a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#37 0x00007fff49b4ca8f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#38 0x00007fff47187bdf in ?? () from /usr/lib/libQtGui.so.4
#39 0x00007fff49b21f42 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#40 0x00007fff49b22314 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#41 0x00007fff49b245e4 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#42 0x00007fff3d9636bb in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#43 0x0000000000407215 in _start ()

Reported using DrKonqi