Application that crashed: kwin
Version of the application: 4.3.4 (KDE 4.3.4)
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.31.9-174.fc12.i686.PAE i686

What I was doing when the application crashed:
After a crapy update I wasn't able to access Phonon menu in System Settings and I tried to kill System Settings manually from System Monitor!

 -- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#6  QProcess::setProcessState (this=0x8803b08, state=NotRunning) at io/qprocess.cpp:1329
#7  0x06b233fa in QProcessPrivate::cleanup (this=<value optimized out>) at io/qprocess.cpp:455
#8  0x06b28747 in QProcessPrivate::_q_processDied (this=<value optimized out>) at io/qprocess.cpp:708
#9  0x06b2885e in QProcess::qt_metacall (this=<value optimized out>, _c=<value optimized out>, _id=13, _a=<value optimized out>) at .moc/release-shared/moc_qprocess.cpp:109
#10 0x06b9bc0c in QMetaObject::activate (sender=<value optimized out>, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=<value optimized out>)
    at kernel/qobject.cpp:3112
#11 0x06b9c843 in QMetaObject::activate (sender=<value optimized out>, m=<value optimized out>, local_signal_index=<value optimized out>, argv=<value optimized out>) at kernel/qobject.cpp:3186
#12 0x06bd6184 in QSocketNotifier::activated (this=<value optimized out>, _t1=18) at .moc/release-shared/moc_qsocketnotifier.cpp:83
#13 0x06ba05af in QSocketNotifier::event (this=<value optimized out>, e=<value optimized out>) at kernel/qsocketnotifier.cpp:316
#14 0x0701ab24 in QApplicationPrivate::notify_helper (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:4065
#15 0x07022281 in QApplication::notify (this=<value optimized out>, receiver=<value optimized out>, e=<value optimized out>) at kernel/qapplication.cpp:3605
#16 0x0359c07b in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#17 0x0248f8b0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#18 0x06b85d73 in QCoreApplication::notifyInternal (this=<value optimized out>, receiver=<value optimized out>, event=<value optimized out>) at kernel/qcoreapplication.cpp:610
#19 0x06bb0e0a in sendEvent (event=<value optimized out>, receiver=<value optimized out>) at kernel/qcoreapplication.h:213
#20 socketNotifierSourceDispatch (event=<value optimized out>, receiver=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:110
#21 0x00a3e128 in g_main_dispatch (context=<value optimized out>) at gmain.c:1960
#22 IA__g_main_context_dispatch (context=<value optimized out>) at gmain.c:2513
#23 0x00a41a58 in g_main_context_iterate (context=<value optimized out>, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>) at gmain.c:2591
#24 0x00a41b84 in IA__g_main_context_iteration (context=0x85a5890, may_block=<value optimized out>) at gmain.c:2654
#25 0x06bb0ba7 in QEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:329
#26 0x070ba356 in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#27 0x06b842aa in QEventLoop::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:149
#28 0x06b8470a in QEventLoop::exec (this=<value optimized out>, flags=<value optimized out>) at kernel/qeventloop.cpp:201
#29 0x06b86bf7 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#30 0x0701a9a8 in QApplication::exec () at kernel/qapplication.cpp:3525
#31 0x024924a9 in kdemain () from /usr/lib/libkdeinit4_kwin.so
#32 0x0804872c in _start ()

Reported using DrKonqi