Application: kontact (4.4.7)
KDE Platform Version: 4.5.3 (KDE 4.5.3)
Qt Version: 4.7.1
Operating System: Linux 2.6.34.7-0.5-desktop x86_64
Distribution: "openSUSE 11.3 (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed: I started Kontact (cf. console output below).
user:~> kontact
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
"/usr/bin/kontact(7719)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kontact(7719)" Soprano: "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kontact(7719)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kontact(7719)" Soprano: "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/kontact(7719)" Soprano: "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kontact(7719)" Soprano: "QLocalSocket::connectToServer: Invalid name"
kontact(7719)/kio (KIOJob) KIO::TransferJob::slotData: mimeType() not emitted when sending first data!; job URL = KUrl("pop3://[mail-address]:110/index") data size = 11 
kontact(7719)/kio (KIOJob) KIO::TransferJob::slotData: mimeType() not emitted when sending first data!; job URL = KUrl("pop3://[mail-address]:110/index") data size = 7 
*** KMail got signal 11 (Crashing)
user:~> KCrash: Application 'kontact' crashing...
KCrash: Attempting to start /usr/lib64/kde4/libexec/drkonqi from kdeinit
sock_file=/home/m_kistler/.kde4/socket-MartinLaptop.intranet.ch/kdeinit4__0

The crash can be reproduced every time.

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0x00007fbeee5bae2a in KTimeZone::~KTimeZone() () from /usr/lib64/libkdecore.so.5
#7  0x00007fbeee5d1024 in KDateTime::~KDateTime() () from /usr/lib64/libkdecore.so.5
#8  0x00007fbeea3c1a00 in KCal::Todo::isOverdue() const () from /usr/lib64/libkcal.so.4
#9  0x00007fbece562b3b in ?? () from /usr/lib64/libkorganizerprivate.so.4
#10 0x00007fbeedb406c1 in QSortFilterProxyModel::data (this=<value optimized out>, index=<value optimized out>, role=8) at itemviews/qsortfilterproxymodel.cpp:1715
#11 0x00007fbeedb621e3 in data (this=0x1725330, option=0x7fff6e13c930, index=...) at ../../src/corelib/kernel/qabstractitemmodel.h:398
#12 QStyledItemDelegate::initStyleOption (this=0x1725330, option=0x7fff6e13c930, index=...) at itemviews/qstyleditemdelegate.cpp:386
#13 0x00007fbeedb63290 in QStyledItemDelegate::sizeHint (this=0x1725330, option=..., index=...) at itemviews/qstyleditemdelegate.cpp:445
#14 0x00007fbece567a63 in ?? () from /usr/lib64/libkorganizerprivate.so.4
#15 0x00007fbeedafdab0 in QTreeView::indexRowSizeHint (this=<value optimized out>, index=...) at itemviews/qtreeview.cpp:2801
#16 0x00007fbeedafdf14 in QTreeViewPrivate::itemHeight (this=0x171a8d0, item=6) at itemviews/qtreeview.cpp:3229
#17 0x00007fbeedafe1af in QTreeViewPrivate::updateScrollBars (this=0x171a8d0) at itemviews/qtreeview.cpp:3452
#18 0x00007fbeedafe57d in QTreeView::updateGeometries (this=0x171a890) at itemviews/qtreeview.cpp:2686
#19 0x00007fbeedb06079 in QTreeView::timerEvent (this=0x171a890, event=0x7fff6e13db20) at itemviews/qtreeview.cpp:1183
#20 0x00007fbeee2018c9 in QObject::event (this=0x171a890, e=<value optimized out>) at kernel/qobject.cpp:1175
#21 0x00007fbeed5fce4d in QWidget::event (this=0x171a890, event=0x7fff6e13db20) at kernel/qwidget.cpp:8659
#22 0x00007fbeed9aa006 in QFrame::event (this=0x171a890, e=0x7fff6e13db20) at widgets/qframe.cpp:557
#23 0x00007fbeeda2b1ab in QAbstractScrollArea::event (this=0x171a890, e=0x7fff6e13db20) at widgets/qabstractscrollarea.cpp:996
#24 0x00007fbeedac5abb in QAbstractItemView::event (this=0x171a890, event=0x7fff6e13db20) at itemviews/qabstractitemview.cpp:1555
#25 0x00007fbeed5abcd4 in QApplicationPrivate::notify_helper (this=0x63cc00, receiver=0x171a890, e=0x7fff6e13db20) at kernel/qapplication.cpp:4445
#26 0x00007fbeed5b41ca in QApplication::notify (this=<value optimized out>, receiver=0x171a890, e=0x7fff6e13db20) at kernel/qapplication.cpp:4324
#27 0x00007fbeeeb39866 in KApplication::notify (this=0x7fff6e1411b0, receiver=0x171a890, event=0x7fff6e13db20) at /usr/src/debug/kdelibs-4.5.3/kdeui/kernel/kapplication.cpp:310
#28 0x00007fbeee1edd5c in QCoreApplication::notifyInternal (this=0x7fff6e1411b0, receiver=0x171a890, event=0x7fff6e13db20) at kernel/qcoreapplication.cpp:732
#29 0x00007fbeee21b568 in sendEvent (this=0x649e70) at kernel/qcoreapplication.h:215
#30 QTimerInfoList::activateTimers (this=0x649e70) at kernel/qeventdispatcher_unix.cpp:618
#31 0x00007fbeee2182e4 in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#32 0x00007fbee58aca93 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#33 0x00007fbee58ad270 in ?? () from /usr/lib64/libglib-2.0.so.0
#34 0x00007fbee58ad510 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#35 0x00007fbeee2189af in QEventDispatcherGlib::processEvents (this=0x6132b0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:415
#36 0x00007fbeed650eae in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#37 0x00007fbeee1ed192 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#38 0x00007fbeee1ed3a5 in QEventLoop::exec (this=0x7fff6e13de30, flags=...) at kernel/qeventloop.cpp:201
#39 0x00007fbeee5da936 in KJob::exec() () from /usr/lib64/libkdecore.so.5
#40 0x00007fbed55a39be in ?? () from /usr/lib64/kde4/kontact_specialdatesplugin.so
#41 0x00007fbed55a7320 in ?? () from /usr/lib64/kde4/kontact_specialdatesplugin.so
#42 0x00007fbeee202f1f in QMetaObject::activate (sender=0xea2740, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3272
#43 0x00007fbeea3c379c in KCal::Calendar::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkcal.so.4
#44 0x00007fbeea3d6f60 in KCal::CalendarResources::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkcal.so.4
#45 0x00007fbeee202f1f in QMetaObject::activate (sender=0xec0f10, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7fff6e13eb00) at kernel/qobject.cpp:3272
#46 0x00007fbeea3d2faf in KCal::ResourceCalendar::resourceChanged(KCal::ResourceCalendar*) () from /usr/lib64/libkcal.so.4
#47 0x00007fbecf90bf79 in ?? () from /usr/lib64/kde4/kcal_akonadi.so
#48 0x00007fbecf8f2628 in ?? () from /usr/lib64/kde4/kcal_akonadi.so
#49 0x00007fbeea3e622f in KCal::ResourceCalendar::load() () from /usr/lib64/libkcal.so.4
#50 0x00007fbeea40e75c in KCal::CalendarResources::load() () from /usr/lib64/libkcal.so.4
#51 0x00007fbece8803e0 in ?? () from /usr/lib64/kde4/korganizerpart.so
#52 0x00007fbece88086f in QObject* KPluginFactory::createPartInstance<KOrganizerPart>(QWidget*, QObject*, QList<QVariant> const&) () from /usr/lib64/kde4/korganizerpart.so
#53 0x00007fbeee65dab4 in KPluginFactory::create(char const*, QWidget*, QObject*, QList<QVariant> const&, QString const&) () from /usr/lib64/libkdecore.so.5
#54 0x00007fbeef3b1107 in KontactInterface::Core::createPart(char const*) () from /usr/lib64/libkontactinterface.so.4
#55 0x00007fbed5388b60 in ?? () from /usr/lib64/kde4/kontact_korganizerplugin.so
#56 0x00007fbeef3b0809 in KontactInterface::Plugin::part() () from /usr/lib64/libkontactinterface.so.4
#57 0x00007fbed538e0df in ?? () from /usr/lib64/kde4/kontact_korganizerplugin.so
#58 0x00007fbed5388a24 in ?? () from /usr/lib64/kde4/kontact_korganizerplugin.so
#59 0x00007fbed48d813f in ?? () from /usr/lib64/kde4/kontact_summaryplugin.so
#60 0x00007fbed48d8ef8 in ?? () from /usr/lib64/kde4/kontact_summaryplugin.so
#61 0x00007fbed48d9066 in ?? () from /usr/lib64/kde4/kontact_summaryplugin.so
#62 0x00007fbed48d4224 in ?? () from /usr/lib64/kde4/kontact_summaryplugin.so
#63 0x00007fbeef3b0809 in KontactInterface::Plugin::part() () from /usr/lib64/libkontactinterface.so.4
#64 0x00007fbeef95747e in Kontact::MainWindow::selectPlugin(KontactInterface::Plugin*) () from /usr/lib64/libkontactprivate.so.4
#65 0x00007fbeef94f775 in Kontact::MainWindow::selectPlugin(QString const&) () from /usr/lib64/libkontactprivate.so.4
#66 0x00007fbeef953be9 in Kontact::MainWindow::loadSettings() () from /usr/lib64/libkontactprivate.so.4
#67 0x00007fbeef9568b0 in Kontact::MainWindow::initObject() () from /usr/lib64/libkontactprivate.so.4
#68 0x00007fbeef956efc in Kontact::MainWindow::MainWindow() () from /usr/lib64/libkontactprivate.so.4
#69 0x0000000000403514 in _start ()

Reported using DrKonqi