Version:            (using KDE 4.1.3)
OS:                Linux
Installed from:    Ubuntu Packages

Just launch Kontact, from summary click on a task.

Application : Kontact (kontact), signal SIGSEGV
(no debugging symbols found)
   (...)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xb4d4b6c0 (LWP 8115)]
[New Thread 0xb0ca3b90 (LWP 8146)]
(no debugging symbols found)
   (...)
(no debugging symbols found)
[KCrash handler]
#6  0xb7e38b26 in qHash () from /usr/lib/libQtCore.so.4
#7  0xb56c3cbf in ?? () from /usr/lib/libkcal.so.4
#8  0xb56beaba in KCal::CalendarLocal::event () from /usr/lib/libkcal.so.4
#9  0xb570e2d7 in KCal::ResourceCached::event () from /usr/lib/libkcal.so.4
#10 0xb571cc22 in KCal::CalendarResources::event () from /usr/lib/libkcal.so.4
#11 0xb56b633e in KCal::Calendar::incidence () from /usr/lib/libkcal.so.4
#12 0xb01dc0cb in CalendarView::editIncidence ()
   from /usr/lib/libkorganizerprivate.so.4
#13 0xb025af07 in ActionManager::editIncidence ()
   from /usr/lib/libkorganizerprivate.so.4
#14 0xb027c8c7 in KOrganizerIfaceImpl::editIncidence ()
   from /usr/lib/libkorganizerprivate.so.4
#15 0xb02be958 in ?? () from /usr/lib/libkorganizerprivate.so.4
#16 0xb690926e in ?? () from /usr/lib/libQtDBus.so.4
#17 0xb690a4a7 in ?? () from /usr/lib/libQtDBus.so.4
#18 0xb690a9b1 in ?? () from /usr/lib/libQtDBus.so.4
#19 0xb690b527 in ?? () from /usr/lib/libQtDBus.so.4
#20 0xb690bb4a in ?? () from /usr/lib/libQtDBus.so.4
#21 0xb690be09 in ?? () from /usr/lib/libQtDBus.so.4
#22 0xb690db9f in ?? () from /usr/lib/libQtDBus.so.4
#23 0xb68f7a31 in QDBusConnection::call () from /usr/lib/libQtDBus.so.4
#24 0xb6916dab in QDBusAbstractInterface::callWithArgumentList ()
   from /usr/lib/libQtDBus.so.4
#25 0xb1c08639 in ?? () from /usr/lib/kde4/kontact_todoplugin.so
#26 0xb1c0b8b5 in ?? () from /usr/lib/kde4/kontact_todoplugin.so
#27 0xb7f1ca60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#28 0xb7f1d7e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#29 0xb7b15653 in KUrlLabel::leftClickedUrl () from /usr/lib/libkdeui.so.5
#30 0xb7b16232 in KUrlLabel::mouseReleaseEvent () from /usr/lib/libkdeui.so.5
#31 0xb6f66962 in QWidget::event () from /usr/lib/libQtGui.so.4
#32 0xb729dfd3 in QFrame::event () from /usr/lib/libQtGui.so.4
#33 0xb72a3579 in QLabel::event () from /usr/lib/libQtGui.so.4
#34 0xb7b16067 in KUrlLabel::event () from /usr/lib/libkdeui.so.5
#35 0xb6f0e8ec in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#36 0xb6f170e1 in QApplication::notify () from /usr/lib/libQtGui.so.4
#37 0xb7a09b2d in KApplication::notify () from /usr/lib/libkdeui.so.5
#38 0xb7f07e61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#39 0xb6f1636e in QApplicationPrivate::sendMouseEvent ()
   from /usr/lib/libQtGui.so.4
#40 0xb6f80656 in ?? () from /usr/lib/libQtGui.so.4
#41 0xb6f7f9e5 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#42 0xb6fa97aa in ?? () from /usr/lib/libQtGui.so.4
#43 0xb6ae36f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#44 0xb6ae6da3 in ?? () from /usr/lib/libglib-2.0.so.0
#45 0xb6ae6f61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#46 0xb7f32478 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#47 0xb6fa8ea5 in ?? () from /usr/lib/libQtGui.so.4
#48 0xb7f0652a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#49 0xb7f066ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#50 0xb7f08da5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#51 0xb6f0e767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#52 0x0804bf52 in _start ()
#0  0xb8024430 in __kernel_vsyscall ()