Application that crashed: korganizer
Version of the application: 4.3.0
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-ARCH x86_64

What I was doing when the application crashed:
I can crash KOrganizer reproducibly by double-clicking on a birthday event, then clicking on the person's name making the contact details from KAddressbook pop up. Then click either "Ok" or "Cancel" and Korganizer will crash.

I'm using an iCalendar file in KOrganizer and a vcard file in KAddressbook.

 -- Backtrace:
Application: KOrganizer (korganizer), signal: Segmentation fault
[KCrash Handler]
#5  0x00007f52cb31a00a in KOrg::IncidenceMonthItem::realStartDate () from /usr/lib/libkorganizerprivate.so.4
#6  0x00007f52cb317c05 in KOrg::MonthView::reloadIncidences () from /usr/lib/libkorganizerprivate.so.4
#7  0x00007f52cb318d9f in KOrg::MonthView::setStartDate () from /usr/lib/libkorganizerprivate.so.4
#8  0x00007f52cb318dfe in KOrg::MonthView::showDates () from /usr/lib/libkorganizerprivate.so.4
#9  0x00007f52cb35b616 in KOViewManager::updateView () from /usr/lib/libkorganizerprivate.so.4
#10 0x00007f52cb34b01a in CalendarView::updateView () from /usr/lib/libkorganizerprivate.so.4
#11 0x00007f52cb34cb01 in CalendarView::updateView () from /usr/lib/libkorganizerprivate.so.4
#12 0x00007f52cb35a188 in CalendarView::qt_metacall () from /usr/lib/libkorganizerprivate.so.4
#13 0x00007f52ca461e0c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0x00007f52cba0c56e in KCal::Calendar::qt_metacall () from /usr/lib/libkcal.so.4
#15 0x00007f52cba69ec0 in KCal::CalendarResources::qt_metacall () from /usr/lib/libkcal.so.4
#16 0x00007f52ca461e0c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#17 0x00007f52cba5971f in KCal::ResourceCalendar::resourceChanged () from /usr/lib/libkcal.so.4
#18 0x00007f52bbc35cf0 in KCal::ResourceKABC::qt_metacall () from /usr/lib/kde4/kcal_kabc.so
#19 0x00007f52ca461e0c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#20 0x00007f52c6c7226f in KABC::AddressBook::addressBookChanged () from /usr/lib/libkabc.so.4
#21 0x00007f52bc04a456 in KABC::ResourceFile::fileChanged () from /usr/lib/libkabc_file_core.so.4
#22 0x00007f52bc04a7a9 in KABC::ResourceFile::qt_metacall () from /usr/lib/libkabc_file_core.so.4
#23 0x00007f52ca461e0c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0x00007f52c7237915 in KDirWatch::created () from /usr/lib/libkio.so.5
#25 0x00007f52c72382e0 in KDirWatch::setCreated () from /usr/lib/libkio.so.5
#26 0x00007f52c72387d4 in KDirWatchPrivate::emitEvent () from /usr/lib/libkio.so.5
#27 0x00007f52c723e611 in KDirWatchPrivate::slotRescan () from /usr/lib/libkio.so.5
#28 0x00007f52c723f9a4 in KDirWatchPrivate::qt_metacall () from /usr/lib/libkio.so.5
#29 0x00007f52ca461e0c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#30 0x00007f52ca45bdb3 in QObject::event () from /usr/lib/libQtCore.so.4
#31 0x00007f52c98f8e2c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#32 0x00007f52c99000fe in QApplication::notify () from /usr/lib/libQtGui.so.4
#33 0x00007f52cc121ff6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#34 0x00007f52ca44cd0c in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#35 0x00007f52ca478322 in ?? () from /usr/lib/libQtCore.so.4
#36 0x00007f52ca47528d in ?? () from /usr/lib/libQtCore.so.4
#37 0x00007f52c3155dbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#38 0x00007f52c3159568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#39 0x00007f52c3159690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#40 0x00007f52ca4751d6 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#41 0x00007f52c998bdde in ?? () from /usr/lib/libQtGui.so.4
#42 0x00007f52ca44b612 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#43 0x00007f52ca44b9e4 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#44 0x00007f52ca44db99 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#45 0x00000000004085e2 in _start ()

Reported using DrKonqi