Application: korgac (4.8 rc1)
KDE Platform Version: 4.7.95 (4.8 RC1 (4.7.95) (Compiled from sources)
Qt Version: 4.7.4
Operating System: Linux 3.1.0-gentoo-r1 x86_64
Distribution: "Gentoo Base System release 2.0.3"

-- Information about the crash:
- What I was doing when the application crashed:

I was away from my laptop for 30 minutes and when I returned, I found korgac and plasma-desktop both to be crashed.
The crashes seem to be related to each other.

The backtrace of korgac is attached, the backtrace of plasma-desktop will be available in a separate bug.

The crash can be reproduced some of the time.

-- Backtrace:
Application: KOrganizer Reminder Daemon (korgac), signal: Segmentation fault
[KCrash Handler]
#6  QModelIndex (other=..., this=<optimized out>) at /usr/include/qt4/QtCore/qabstractitemmodel.h:65
#7  KDescendantsProxyModel::mapFromSource (this=0x8c0e80, sourceIndex=...) at /var/tmp/portage/kde-base/kdelibs-4.7.95/work/kdelibs-4.7.95/kdeui/itemviews/kdescendantsproxymodel.cpp:462
#8  0x00007fd26ca3aa33 in KDescendantsProxyModelPrivate::sourceRowsAboutToBeRemoved (this=0x827550, parent=..., start=5, end=5) at /var/tmp/portage/kde-base/kdelibs-4.7.95/work/kdelibs-4.7.95/kdeui/itemviews/kdescendantsproxymodel.cpp:697
#9  0x00007fd26ca3e655 in KDescendantsProxyModel::qt_metacall (this=0x8c0e80, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff4420b8c0) at /var/tmp/portage/kde-base/kdelibs-4.7.95/work/kdelibs-4.7.95_build/kdeui/moc_kdescendantsproxymodel.cpp:97
#10 0x00007fd269b8d3e0 in QMetaObject::activate (sender=0x844330, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff4420b8c0) at kernel/qobject.cpp:3278
#11 0x00007fd269bce080 in QAbstractItemModel::rowsAboutToBeRemoved (this=<optimized out>, _t1=<optimized out>, _t2=5, _t3=5) at .moc/release-shared/moc_qabstractitemmodel.cpp:188
#12 0x00007fd269b72daf in QAbstractItemModel::beginRemoveRows (this=<optimized out>, parent=<optimized out>, first=<optimized out>, last=<optimized out>) at kernel/qabstractitemmodel.cpp:2449
#13 0x00007fd26c03dade in Akonadi::EntityTreeModelPrivate::monitoredItemRemoved (this=0x8c0d20, item=...) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95/akonadi/entitytreemodel_p.cpp:1052
#14 0x00007fd26c02e372 in Akonadi::EntityTreeModel::qt_metacall (this=0x844330, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff4420bb50) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95_build/akonadi/entitytreemodel.moc:168
#15 0x00007fd269b8d3e0 in QMetaObject::activate (sender=0x842650, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff4420bb50) at kernel/qobject.cpp:3278
#16 0x00007fd26c074865 in Akonadi::Monitor::itemRemoved (this=<optimized out>, _t1=<optimized out>) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95_build/akonadi/monitor.moc:196
#17 0x00007fd26c07771e in Akonadi::MonitorPrivate::emitItemNotification (this=0x841870, msg=..., item=<optimized out>, collection=<optimized out>, collectionDest=<optimized out>) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95/akonadi/monitor_p.cpp:535
#18 0x00007fd26c079774 in Akonadi::MonitorPrivate::emitNotification (this=0x841870, msg=...) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95/akonadi/monitor_p.cpp:288
#19 0x00007fd26bfe6c0d in Akonadi::ChangeRecorderPrivate::emitNotification (this=0x841870, msg=<optimized out>) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95/akonadi/changerecorder_p.h:60
#20 0x00007fd26c07834b in Akonadi::MonitorPrivate::flushPipeline (this=0x841870) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95/akonadi/monitor_p.cpp:429
#21 0x00007fd26c0783e1 in Akonadi::MonitorPrivate::dataAvailable (this=0x841870) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95/akonadi/monitor_p.cpp:438
#22 0x00007fd26c074e86 in Akonadi::Monitor::qt_metacall (this=0x842650, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff4420c0e0) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95_build/akonadi/monitor.moc:160
#23 0x00007fd26bfe540a in Akonadi::ChangeRecorder::qt_metacall (this=0x842650, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=<optimized out>) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95_build/akonadi/changerecorder.moc:72
#24 0x00007fd269b8d3e0 in QMetaObject::activate (sender=0x842e00, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3278
#25 0x00007fd26bfeb67e in Akonadi::EntityCache<Akonadi::Collection, Akonadi::CollectionFetchJob, Akonadi::CollectionFetchScope>::processResult (this=0x842e00, job=<optimized out>) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95/akonadi/entitycache_p.h:192
#26 0x00007fd26c026e7a in Akonadi::EntityCacheBase::qt_metacall (this=0x842e00, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff4420c2d0) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95_build/akonadi/entitycache_p.moc:77
#27 0x00007fd269b8d3e0 in QMetaObject::activate (sender=0x1e97bb0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff4420c2d0) at kernel/qobject.cpp:3278
#28 0x00007fd26a259e00 in KJob::result (this=<optimized out>, _t1=0x1e97bb0) at /var/tmp/portage/kde-base/kdelibs-4.7.95/work/kdelibs-4.7.95_build/kdecore/kjob.moc:194
#29 0x00007fd26a259e36 in KJob::emitResult (this=0x1e97bb0) at /var/tmp/portage/kde-base/kdelibs-4.7.95/work/kdelibs-4.7.95/kdecore/jobs/kjob.cpp:318
#30 0x00007fd26c0710cb in Akonadi::JobPrivate::handleResponse (this=<optimized out>, tag=<optimized out>, data=<optimized out>) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95/akonadi/job.cpp:66
#31 0x00007fd26c0a172f in Akonadi::SessionPrivate::dataReceived (this=0x8595a0) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95/akonadi/session.cpp:218
#32 0x00007fd26c0a4374 in Akonadi::Session::qt_metacall (this=0x827520, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff4420c600) at /var/tmp/portage/kde-base/kdepimlibs-4.7.95/work/kdepimlibs-4.7.95_build/akonadi/session.moc:96
#33 0x00007fd269b8d3e0 in QMetaObject::activate (sender=0x859510, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3278
#34 0x00007fd269bcd6aa in QIODevice::qt_metacall (this=0x859510, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff4420c720) at .moc/release-shared/moc_qiodevice.cpp:77
#35 0x00007fd266daa7e7 in QLocalSocket::qt_metacall (this=0x859510, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff4420c720) at .moc/release-shared/moc_qlocalsocket.cpp:81
#36 0x00007fd269b8d3e0 in QMetaObject::activate (sender=0x842120, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3278
#37 0x00007fd266da5d98 in QAbstractSocketPrivate::canReadNotification (this=0x841090) at socket/qabstractsocket.cpp:643
#38 0x00007fd266d9636d in QReadNotifier::event (this=<optimized out>, e=<optimized out>) at socket/qnativesocketengine.cpp:1103
#39 0x00007fd26a7bb1f8 in QApplicationPrivate::notify_helper (this=0x6592e0, receiver=0x79bd50, e=0x7fff4420ccc0) at kernel/qapplication.cpp:4481
#40 0x00007fd26a7bf8b0 in QApplication::notify (this=<optimized out>, receiver=0x79bd50, e=0x7fff4420ccc0) at kernel/qapplication.cpp:4360
#41 0x00007fd26ca73590 in KApplication::notify (this=0x7fff4420cfa0, receiver=0x79bd50, event=0x7fff4420ccc0) at /var/tmp/portage/kde-base/kdelibs-4.7.95/work/kdelibs-4.7.95/kdeui/kernel/kapplication.cpp:311
#42 0x00007fd269b7ace0 in QCoreApplication::notifyInternal (this=0x7fff4420cfa0, receiver=0x79bd50, event=0x7fff4420ccc0) at kernel/qcoreapplication.cpp:787
#43 0x00007fd269ba15e5 in sendEvent (event=0x7fff4420ccc0, receiver=<optimized out>) at kernel/qcoreapplication.h:215
#44 socketNotifierSourceDispatch (source=0x668090) at kernel/qeventdispatcher_glib.cpp:110
#45 0x00007fd263c81047 in g_main_dispatch (context=0x6669a0) at gmain.c:2425
#46 g_main_context_dispatch (context=0x6669a0) at gmain.c:2995
#47 0x00007fd263c8178c in g_main_context_iterate (context=0x6669a0, block=1, dispatch=1, self=<optimized out>) at gmain.c:3073
#48 0x00007fd263c81947 in g_main_context_iteration (context=0x6669a0, may_block=1) at gmain.c:3136
#49 0x00007fd269ba1b3c in QEventDispatcherGlib::processEvents (this=0x62b690, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#50 0x00007fd26a8524c6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#51 0x00007fd269b7a268 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#52 0x00007fd269b7a45f in QEventLoop::exec (this=0x7fff4420cf00, flags=...) at kernel/qeventloop.cpp:201
#53 0x00007fd269b7db59 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#54 0x0000000000411a31 in main (argc=3, argv=0x7fff4420d298) at /var/tmp/portage/kde-base/korganizer-4.7.95/work/korganizer-4.7.95/korganizer/korgac/korgacmain.cpp:96

Reported using DrKonqi