Application that crashed: kontact
Version of the application: 4.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.32-0.slh.1-sidux-686 i686
Distribution: Debian GNU/Linux unstable (sid)

What I was doing when the application crashed:
After adding icons to the toolbar in any application in kontact (no matter if locked or unlocked) and pressing "Apply" kontact is crashing.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0xb3c6dfaa in qobject_cast<QMainWindow*> (this=0x9284068, bar=0x9ff7588) at /usr/include/qt4/QtCore/qobject.h:443
#7  Bespin::Style::updateUno (this=0x9284068, bar=0x9ff7588) at /home/steve/downloads/themes/cloudcity/bespin.cpp:872
#8  0xb3c6e27a in Bespin::Style::updateUno (this=0x9284068) at /home/steve/downloads/themes/cloudcity/bespin.cpp:865
#9  0xb3cada4b in Bespin::Style::qt_metacall (this=0x9284068, _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0xbfc401e8) at /home/steve/downloads/themes/cloudcity/build/moc_bespin.cxx:91
#10 0xb7066303 in QMetaObject::activate (sender=0x9be2880, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#11 0xb7066f42 in QMetaObject::activate (sender=0x9be2880, m=0xb7141d88, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3186
#12 0xb706c007 in QSingleShotTimer::timeout (this=0x9be2880) at .moc/release-shared/qtimer.moc:76
#13 0xb706c12c in QSingleShotTimer::timerEvent (this=0x9be2880) at kernel/qtimer.cpp:298
#14 0xb706139f in QObject::event (this=0x9be2880, e=0xbfc4066c) at kernel/qobject.cpp:1074
#15 0xb6690a94 in QApplicationPrivate::notify_helper (this=0x921b9b8, receiver=0x9be2880, e=0xbfc4066c) at kernel/qapplication.cpp:4065
#16 0xb6698bee in QApplication::notify (this=0xbfc4132c, receiver=0x9be2880, e=0xbfc4066c) at kernel/qapplication.cpp:3605
#17 0xb75530fd in KApplication::notify (this=0xbfc4132c, receiver=0x9be2880, event=0xbfc4066c) at ../../kdeui/kernel/kapplication.cpp:302
#18 0xb70511eb in QCoreApplication::notifyInternal (this=0xbfc4132c, receiver=0x9be2880, event=0xbfc4066c) at kernel/qcoreapplication.cpp:610
#19 0xb707fe21 in QCoreApplication::sendEvent (this=0x921f474) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#20 QTimerInfoList::activateTimers (this=0x921f474) at kernel/qeventdispatcher_unix.cpp:580
#21 0xb707c317 in timerSourceDispatch (source=0x921f4b0) at kernel/qeventdispatcher_glib.cpp:184
#22 idleTimerSourceDispatch (source=0x921f4b0) at kernel/qeventdispatcher_glib.cpp:231
#23 0xb4acff28 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#24 0xb4ad36b3 in ?? () from /lib/libglib-2.0.so.0
#25 0xb4ad3838 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#26 0xb707c041 in QEventDispatcherGlib::processEvents (this=0x91ed718, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#27 0xb6730305 in QGuiEventDispatcherGlib::processEvents (this=0x91ed718, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#28 0xb704f83a in QEventLoop::processEvents (this=0xbfc4088c, flags=...) at kernel/qeventloop.cpp:149
#29 0xb704fc82 in QEventLoop::exec (this=0xbfc4088c, flags=...) at kernel/qeventloop.cpp:201
#30 0xb6b73873 in QDialog::exec (this=0xbfc408d4) at dialogs/qdialog.cpp:498
#31 0xb78439c7 in Kontact::MainWindow::configureToolbars() () from /usr/lib/libkontactprivate.so.4
#32 0xb784b359 in Kontact::MainWindow::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkontactprivate.so.4
#33 0xb705fb0b in QMetaCallEvent::placeMetaCall (this=0xa28e208, object=0x93840b0) at kernel/qobject.cpp:477
#34 0xb70615e0 in QObject::event (this=0x93840b0, e=0xa28e208) at kernel/qobject.cpp:1110
#35 0xb66e6300 in QWidget::event (this=0x93840b0, event=0xa28e208) at kernel/qwidget.cpp:7951
#36 0xb6aa98f7 in QMainWindow::event (this=0x93840b0, event=0xa28e208) at widgets/qmainwindow.cpp:1399
#37 0xb7635797 in KMainWindow::event (this=0x93840b0, ev=0xa28e208) at ../../kdeui/widgets/kmainwindow.cpp:1094
#38 0xb767a39c in KXmlGuiWindow::event (this=0x93840b0, ev=0xa28e208) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:131
#39 0xb6690a94 in QApplicationPrivate::notify_helper (this=0x921b9b8, receiver=0x93840b0, e=0xa28e208) at kernel/qapplication.cpp:4065
#40 0xb6698cc2 in QApplication::notify (this=0xbfc4132c, receiver=0x93840b0, e=0xa28e208) at kernel/qapplication.cpp:4030
#41 0xb75530fd in KApplication::notify (this=0xbfc4132c, receiver=0x93840b0, event=0xa28e208) at ../../kdeui/kernel/kapplication.cpp:302
#42 0xb70511eb in QCoreApplication::notifyInternal (this=0xbfc4132c, receiver=0x93840b0, event=0xa28e208) at kernel/qcoreapplication.cpp:610
#43 0xb7051e2e in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x91ed9c8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#44 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x91ed9c8) at kernel/qcoreapplication.cpp:1247
#45 0xb705200d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#46 0xb707c4cf in QCoreApplication::sendPostedEvents (s=0x9213110) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#47 postEventSourceDispatch (s=0x9213110) at kernel/qeventdispatcher_glib.cpp:276
#48 0xb4acff28 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#49 0xb4ad36b3 in ?? () from /lib/libglib-2.0.so.0
#50 0xb4ad3838 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#51 0xb707c041 in QEventDispatcherGlib::processEvents (this=0x91ed718, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#52 0xb6730305 in QGuiEventDispatcherGlib::processEvents (this=0x91ed718, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#53 0xb704f83a in QEventLoop::processEvents (this=0xbfc411a0, flags=...) at kernel/qeventloop.cpp:149
#54 0xb704fc82 in QEventLoop::exec (this=0xbfc411a0, flags=...) at kernel/qeventloop.cpp:201
#55 0xb70520d9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#56 0xb6690917 in QApplication::exec () at kernel/qapplication.cpp:3525
#57 0x0804bd40 in _start ()

Reported using DrKonqi