Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.30.5-43.fc11.i686.PAE i686
Distribution: "Fedora release 11 (Leonidas)"

What I was doing when the application crashed:
when this application is crashed, the kde system rebooted

 -- Backtrace:
Application: Espace de travail Plasma (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7ef6780 (LWP 2955))]

Thread 2 (Thread 0xaccc6b70 (LWP 2956)):
#0  0x001ed416 in __kernel_vsyscall ()
#1  0x004abfa5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x06e0e337 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0x0706e4d2 in ?? () from /usr/lib/libQtNetwork.so.4
#4  0x06e0d2f2 in ?? () from /usr/lib/libQtCore.so.4
#5  0x004a7935 in start_thread () from /lib/libpthread.so.0
#6  0x003dc94e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb7ef6780 (LWP 2955)):
[KCrash Handler]
#6  0x005078d7 in XVisualIDFromVisual () from /usr/lib/libX11.so.6
#7  0x0758878e in ?? () from /usr/lib/libQtGui.so.4
#8  0x0758ee6e in QWidgetPrivate::create_sys(unsigned long, bool, bool) () from /usr/lib/libQtGui.so.4
#9  0x075526b0 in QWidget::create(unsigned long, bool, bool) () from /usr/lib/libQtGui.so.4
#10 0x01155b3e in Plasma::Theme::font(Plasma::Theme::FontRole) const () from /usr/lib/kde4/plasma_applet_systemtray.so
#11 0x01151310 in Plasma::Theme::font(Plasma::Theme::FontRole) const () from /usr/lib/kde4/plasma_applet_systemtray.so
#12 0x011513eb in Plasma::Theme::font(Plasma::Theme::FontRole) const () from /usr/lib/kde4/plasma_applet_systemtray.so
#13 0x06f13853 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x06f144b2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#15 0x06f18967 in ?? () from /usr/lib/libQtCore.so.4
#16 0x06f18a7c in ?? () from /usr/lib/libQtCore.so.4
#17 0x06f0d96f in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#18 0x074fb974 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#19 0x075030e9 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#20 0x021d160a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#21 0x06efdb0b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#22 0x06f2ad7e in ?? () from /usr/lib/libQtCore.so.4
#23 0x06f286a0 in ?? () from /usr/lib/libQtCore.so.4
#24 0x00688308 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0x0068b9e0 in ?? () from /lib/libglib-2.0.so.0
#26 0x0068bb13 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0x06f285ec in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#28 0x0759acb5 in ?? () from /usr/lib/libQtGui.so.4
#29 0x06efc0d9 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0x06efc52a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#31 0x06efe9af in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#32 0x074fb7f7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#33 0x026c242d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#34 0x080486fb in _start ()

Reported using DrKonqi