Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.9-174.fc12.x86_64 x86_64
Distribution: "Fedora release 12 (Constantine)"

What I was doing when the application crashed:
.

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
82	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
The current source language is "auto; currently asm".
[Current thread is 1 (Thread 0x7fd81f82c840 (LWP 8233))]

Thread 2 (Thread 0x7fd808675710 (LWP 8234)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x000000340525addb in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQtCore.so.4
#2  0x0000003405881af4 in ?? () from /usr/lib64/libQtNetwork.so.4
#3  0x0000003405259d25 in ?? () from /usr/lib64/libQtCore.so.4
#4  0x0000003f72a06a3a in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x0000003f722ddf3d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fd81f82c840 (LWP 8233)):
[KCrash Handler]
#5  0x0000003406d09de4 in QGraphicsItem::isWidget() const () from /usr/lib64/libQtGui.so.4
#6  0x0000003406d0c519 in QGraphicsItem::isWindow() const () from /usr/lib64/libQtGui.so.4
#7  0x0000003406d3fa89 in QGraphicsScene::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#8  0x000000340678f65c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#9  0x00000034067968ce in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#10 0x00007fd8210a1a66 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#11 0x000000340533ee6c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#12 0x0000003406d512ae in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib64/libQtGui.so.4
#13 0x000000340533e187 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#14 0x000000340678f62c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#15 0x00000034067968ce in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#16 0x00007fd8210a1a66 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#17 0x000000340533ee6c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#18 0x00000034067dde7b in QWidget::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#19 0x0000003406b35a16 in QFrame::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#20 0x0000003406bc4211 in QAbstractScrollArea::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#21 0x000000340678f65c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#22 0x00000034067968ce in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#23 0x00007fd8210a1a66 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#24 0x000000340533ee6c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#25 0x0000003406799c3b in QApplication::setActiveWindow(QWidget*) () from /usr/lib64/libQtGui.so.4
#26 0x00000034067fab9b in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/libQtGui.so.4
#27 0x000000340682284c in ?? () from /usr/lib64/libQtGui.so.4
#28 0x0000003403e3922e in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#29 0x0000003403e3cc18 in ?? () from /lib64/libglib-2.0.so.0
#30 0x0000003403e3cd3a in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#31 0x00000034053671e6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#32 0x0000003406821ffe in ?? () from /usr/lib64/libQtGui.so.4
#33 0x000000340533d772 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#34 0x000000340533db44 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#35 0x000000340533fcd9 in QCoreApplication::exec() () from /usr/lib64/libQtCore.so.4
#36 0x00007fd822526f4f in kdemain () from /usr/lib64/libkdeinit4_plasma-desktop.so
#37 0x0000003f7221eb1d in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, 
    rtld_fini=<value optimized out>, stack_end=<value optimized out>) at libc-start.c:220
#38 0x0000000000400779 in _start ()

Reported using DrKonqi