Application that crashed: kontact
Version of the application: 4.3.0
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-14-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
When removing a item that claims to have sub items but none appear kontact crashes.  This may be related to kontact not adding sub items correctly to a to-do.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0x00007f6e1093c918 in ?? () from /usr/lib/libkorganizerprivate.so.4
#6  0x00007f6e1095e334 in CalendarView::changeIncidenceDisplay () from /usr/lib/libkorganizerprivate.so.4
#7  0x00007f6e1095e3ee in CalendarView::incidenceDeleted () from /usr/lib/libkorganizerprivate.so.4
#8  0x00007f6e1096d9c4 in CalendarView::qt_metacall () from /usr/lib/libkorganizerprivate.so.4
#9  0x00007f6e2edf2ea2 in QMetaObject::activate (sender=0x1f05500, from_signal_index=<value optimized out>, to_signal_index=8, argv=0x7f6e0c140d40) at kernel/qobject.cpp:3113
#10 0x00007f6e103e7a82 in KOrg::IncidenceChangerBase::incidenceDeleted () from /usr/lib/libkorganizer_interfaces.so.4
#11 0x00007f6e109eee0c in IncidenceChanger::deleteIncidence () from /usr/lib/libkorganizerprivate.so.4
#12 0x00007f6e1095f278 in CalendarView::deleteSubTodosIncidence () from /usr/lib/libkorganizerprivate.so.4
#13 0x00007f6e1095f1ca in CalendarView::deleteSubTodosIncidence () from /usr/lib/libkorganizerprivate.so.4
#14 0x00007f6e1096b235 in CalendarView::deleteTodoIncidence () from /usr/lib/libkorganizerprivate.so.4
#15 0x00007f6e1096b546 in CalendarView::deleteIncidence () from /usr/lib/libkorganizerprivate.so.4
#16 0x00007f6e1096e443 in CalendarView::qt_metacall () from /usr/lib/libkorganizerprivate.so.4
#17 0x00007f6e2edf2ea2 in QMetaObject::activate (sender=0x3845710, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x7f6e0c140d40) at kernel/qobject.cpp:3113
#18 0x00007f6e2f955f37 in QAction::triggered (this=0x3a8ab76, _t1=false) at .moc/release-shared/moc_qaction.cpp:236
#19 0x00007f6e2f9573b0 in QAction::activate (this=0x3845710, event=<value optimized out>) at kernel/qaction.cpp:1160
#20 0x00007f6e2f959ec7 in QAction::event (this=0x3a8ab76, e=<value optimized out>) at kernel/qaction.cpp:1079
#21 0x00007f6e30c8d6d3 in KAction::event (this=0x3a8ab76, event=0x7fff3c895170) at /build/buildd/kde4libs-4.3.0/kdeui/actions/kaction.cpp:88
#22 0x00007f6e2f95bf4d in QApplicationPrivate::notify_helper (this=0x1806520, receiver=0x3845710, e=0x7fff3c895170) at kernel/qapplication.cpp:4056
#23 0x00007f6e2f96418a in QApplication::notify (this=0x7fff3c897870, receiver=0x3845710, e=0x7fff3c895170) at kernel/qapplication.cpp:4021
#24 0x00007f6e30d6071b in KApplication::notify (this=0x7fff3c897870, receiver=0x3845710, event=0x7fff3c895170) at /build/buildd/kde4libs-4.3.0/kdeui/kernel/kapplication.cpp:302
#25 0x00007f6e2eddd6ac in QCoreApplication::notifyInternal (this=0x7fff3c897870, receiver=0x3845710, event=0x7fff3c895170) at kernel/qcoreapplication.cpp:610
#26 0x00007f6e2f99187d in QShortcutMap::dispatchEvent (this=<value optimized out>, e=0x7fff3c895670) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#27 0x00007f6e2f9936dc in QShortcutMap::tryShortcutEvent (this=0x1806638, o=<value optimized out>, e=0x7fff3c895670) at kernel/qshortcutmap.cpp:369
#28 0x00007f6e2f9651b1 in QApplication::notify (this=0x7fff3c897870, receiver=0x2c30c00, e=0x7fff3c895670) at kernel/qapplication.cpp:3645
#29 0x00007f6e30d6071b in KApplication::notify (this=0x7fff3c897870, receiver=0x2c30c00, event=0x7fff3c895670) at /build/buildd/kde4libs-4.3.0/kdeui/kernel/kapplication.cpp:302
#30 0x00007f6e2eddd6ac in QCoreApplication::notifyInternal (this=0x7fff3c897870, receiver=0x2c30c00, event=0x7fff3c895670) at kernel/qcoreapplication.cpp:610
#31 0x00007f6e2f9f16a4 in QKeyMapper::sendKeyEvent (keyWidget=0x2c30c00, grab=<value optimized out>, type=QEvent::KeyPress, code=16777223, modifiers={i = 1015634080}, text=@0x7fff3c895890, 
    autorepeat=false, count=1, nativeScanCode=119, nativeVirtualKey=65535, nativeModifiers=16) at kernel/qkeymapper_x11.cpp:1675
#32 0x00007f6e2f9f3a02 in QKeyMapperPrivate::translateKeyEvent (this=0x1846900, keyWidget=0x2c30c00, event=0x7fff3c8974a0, grab=37) at kernel/qkeymapper_x11.cpp:1645
#33 0x00007f6e2f9cc0e6 in QApplication::x11ProcessEvent (this=0x7fff3c897870, event=0x7fff3c8974a0) at kernel/qapplication_x11.cpp:3443
#34 0x00007f6e2f9f5454 in x11EventSourceDispatch (s=0x1808030, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#35 0x00007f6e2852e20a in IA__g_main_context_dispatch (context=0x1806d30) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#36 0x00007f6e285318e0 in g_main_context_iterate (context=0x1806d30, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#37 0x00007f6e28531a7c in IA__g_main_context_iteration (context=0x1806d30, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#38 0x00007f6e2ee06a8f in QEventDispatcherGlib::processEvents (this=0x1805d40, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#39 0x00007f6e2f9f4bdf in QGuiEventDispatcherGlib::processEvents (this=0x3a8ab76, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#40 0x00007f6e2eddbf42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1015642000}) at kernel/qeventloop.cpp:149
#41 0x00007f6e2eddc314 in QEventLoop::exec (this=0x7fff3c8977d0, flags={i = 1015642080}) at kernel/qeventloop.cpp:201
#42 0x00007f6e2edde5e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#43 0x0000000000404945 in _start ()

Reported using DrKonqi