Application: kontact (4.14.10)
KDE Platform Version: 4.14.35
Qt Version: 4.8.6
Operating System: Linux 4.4.82-desktop-1.mga5 x86_64
Distribution: "Mageia 5"

-- Information about the crash:
- What I was doing when the application crashed: Adding a new appointment, or when I move it to another day or hour, or modifying how long must be it.

The crash can be reproduced every time.

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f2590318800 (LWP 11977))]

Thread 4 (Thread 0x7f256a47c700 (LWP 11978)):
#0  0x00007f258792667f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f258b005bdf in ?? () from /lib64/libQtWebKit.so.4
#2  0x00007f258b005c19 in ?? () from /lib64/libQtWebKit.so.4
#3  0x00007f25879215bd in start_thread () from /lib64/libpthread.so.0
#4  0x00007f258d86f62d in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f2569b53700 (LWP 11979)):
#0  0x00007f258792667f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f258ad34d83 in ?? () from /lib64/libQtWebKit.so.4
#2  0x00007f258b036826 in ?? () from /lib64/libQtWebKit.so.4
#3  0x00007f25879215bd in start_thread () from /lib64/libpthread.so.0
#4  0x00007f258d86f62d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f25166c6700 (LWP 11987)):
#0  0x00007f258d863d6d in poll () from /lib64/libc.so.6
#1  0x00007f258734feb4 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007f258734ffbc in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f258dfe0e3e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#4  0x00007f258dfb2931 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#5  0x00007f258dfb2c45 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#6  0x00007f258deb0899 in QThread::exec() () from /lib64/libQtCore.so.4
#7  0x00007f258deb2fff in QThreadPrivate::start(void*) () from /lib64/libQtCore.so.4
#8  0x00007f25879215bd in start_thread () from /lib64/libpthread.so.0
#9  0x00007f258d86f62d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f2590318800 (LWP 11977)):
[KCrash Handler]
#5  0x00007f2583630ea0 in KCalCore::IncidenceBase::uid() const () from /lib64/libkcalcore.so.4
#6  0x00007f256879dc2b in Akonadi::CalendarBasePrivate::handleUidChange(Akonadi::Item const&, Akonadi::Item const&, QString const&) () from /lib64/libakonadi-calendar.so.4
#7  0x00007f25687aa148 in Akonadi::ETMCalendarPrivate::updateItem(Akonadi::Item const&) () from /lib64/libakonadi-calendar.so.4
#8  0x00007f25687aa50a in Akonadi::ETMCalendarPrivate::onDataChangedInFilteredModel(QModelIndex const&, QModelIndex const&) () from /lib64/libakonadi-calendar.so.4
#9  0x00007f25687ac67d in Akonadi::ETMCalendarPrivate::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libakonadi-calendar.so.4
#10 0x00007f258dfc788a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#11 0x00007f258e010fd7 in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&) () from /lib64/libQtCore.so.4
#12 0x00007f258ef3ae73 in QSortFilterProxyModelPrivate::_q_sourceDataChanged(QModelIndex const&, QModelIndex const&) () from /lib64/libQtGui.so.4
#13 0x00007f258dfc788a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#14 0x00007f258e010fd7 in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&) () from /lib64/libQtCore.so.4
#15 0x00007f258ef3ae73 in QSortFilterProxyModelPrivate::_q_sourceDataChanged(QModelIndex const&, QModelIndex const&) () from /lib64/libQtGui.so.4
#16 0x00007f258dfc788a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#17 0x00007f258e010fd7 in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&) () from /lib64/libQtCore.so.4
#18 0x00007f258f6b5b0c in KDescendantsProxyModelPrivate::sourceDataChanged(QModelIndex const&, QModelIndex const&) () from /lib64/libkdeui.so.5
#19 0x00007f258dfc788a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#20 0x00007f258e010fd7 in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&) () from /lib64/libQtCore.so.4
#21 0x00007f258c7d492c in Akonadi::EntityTreeModelPrivate::dataChanged(QModelIndex const&, QModelIndex const&) () from /lib64/libakonadi-kde.so.4
#22 0x00007f258c7ddb3a in Akonadi::EntityTreeModelPrivate::monitoredItemChanged(Akonadi::Item const&, QSet<QByteArray> const&) () from /lib64/libakonadi-kde.so.4
#23 0x00007f258dfc788a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#24 0x00007f258c81d6a7 in Akonadi::Monitor::itemChanged(Akonadi::Item const&, QSet<QByteArray> const&) () from /lib64/libakonadi-kde.so.4
#25 0x00007f258c827df8 in Akonadi::MonitorPrivate::emitItemsNotification(Akonadi::NotificationMessageV3 const&, QList<Akonadi::Item> const&, Akonadi::Collection const&, Akonadi::Collection const&) () from /lib64/libakonadi-kde.so.4
#26 0x00007f258c82934c in Akonadi::MonitorPrivate::emitNotification(Akonadi::NotificationMessageV3 const&) () from /lib64/libakonadi-kde.so.4
#27 0x00007f258c825061 in Akonadi::MonitorPrivate::flushPipeline() () from /lib64/libakonadi-kde.so.4
#28 0x00007f258c825269 in Akonadi::MonitorPrivate::dataAvailable() () from /lib64/libakonadi-kde.so.4
#29 0x00007f258dfc788a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#30 0x00007f258c77e52a in Akonadi::EntityListCache<Akonadi::Item, Akonadi::ItemFetchJob, Akonadi::ItemFetchScope>::processResult(KJob*) () from /lib64/libakonadi-kde.so.4
#31 0x00007f258dfc788a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#32 0x00007f258e44eb52 in KJob::result(KJob*) () from /lib64/libkdecore.so.5
#33 0x00007f258e44eb90 in KJob::emitResult() () from /lib64/libkdecore.so.5
#34 0x00007f258dfcbd61 in QObject::event(QEvent*) () from /lib64/libQtCore.so.4
#35 0x00007f258e9bc79c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#36 0x00007f258e9c2e40 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#37 0x00007f258f6ef40a in KApplication::notify(QObject*, QEvent*) () from /lib64/libkdeui.so.5
#38 0x00007f258dfb3cad in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib64/libQtCore.so.4
#39 0x00007f258dfb6be1 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQtCore.so.4
#40 0x00007f258dfe0cae in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQtCore.so.4
#41 0x00007f258734fc6d in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#42 0x00007f258734ff18 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#43 0x00007f258734ffbc in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#44 0x00007f258dfe0e1e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#45 0x00007f258ea5a4f6 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtGui.so.4
#46 0x00007f258dfb2931 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#47 0x00007f258dfb2c45 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#48 0x00007f258dfb7e59 in QCoreApplication::exec() () from /lib64/libQtCore.so.4
#49 0x00000000004034fc in main ()

Reported using DrKonqi