Application: korgac (5.2.3)

Qt Version: 5.6.1
Frameworks Version: 5.25.0
Operating System: Linux 4.7.0-1-amd64 x86_64
Distribution: Debian GNU/Linux unstable (sid)

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

In a terminal, just do akonadictl restart. 
Akonadi will stop and start again, kmail will show tha Akonadi unavailable screen for a shor time and kograc will crash very reliably.

The crash can be reproduced every time.

-- Backtrace:
Application: KOrganizer Reminder Daemon (korgac), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fc25c820940 (LWP 26973))]

Thread 6 (Thread 0x7fc24b7fe700 (LWP 30730)):
#0  0x00007fc26f2b1ee5 in g_main_context_prepare (context=context@entry=0x7fc23c002eb0, priority=priority@entry=0x7fc24b7fdb40) at ././glib/gmain.c:3511
#1  0x00007fc26f2b28fb in g_main_context_iterate (context=context@entry=0x7fc23c002eb0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3907
#2  0x00007fc26f2b2aec in g_main_context_iteration (context=0x7fc23c002eb0, may_block=1) at ././glib/gmain.c:3988
#3  0x00007fc2770db51b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc27708319a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc276ea8e53 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc276eadd78 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc26f7d5464 in start_thread (arg=0x7fc24b7fe700) at pthread_create.c:333
#8  0x00007fc2765b297f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7fc24bfff700 (LWP 26993)):
#0  0x00007fc2765a950d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc26f2b29d6 in g_main_context_iterate (priority=<optimized out>, n_fds=1, fds=0x7fc244003020, timeout=<optimized out>, context=0x7fc244000990) at ././glib/gmain.c:4226
#2  0x00007fc26f2b29d6 in g_main_context_iterate (context=context@entry=0x7fc244000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3922
#3  0x00007fc26f2b2aec in g_main_context_iteration (context=0x7fc244000990, may_block=1) at ././glib/gmain.c:3988
#4  0x00007fc2770db51b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc27708319a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc276ea8e53 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc276eadd78 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc26f7d5464 in start_thread (arg=0x7fc24bfff700) at pthread_create.c:333
#9  0x00007fc2765b297f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7fc258874700 (LWP 26992)):
#0  0x00007fc2765a557d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc26f2f6c60 in g_wakeup_acknowledge (__nbytes=16, __buf=0x7fc258873a60, __fd=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/unistd.h:44
#2  0x00007fc26f2f6c60 in g_wakeup_acknowledge (wakeup=0x7fc24c0025a0) at ././glib/gwakeup.c:210
#3  0x00007fc26f2b2485 in g_main_context_check (context=context@entry=0x7fc250000990, max_priority=2147483647, fds=fds@entry=0x7fc250002e20, n_fds=n_fds@entry=1) at ././glib/gmain.c:3705
#4  0x00007fc26f2b2974 in g_main_context_iterate (context=context@entry=0x7fc250000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3924
#5  0x00007fc26f2b2aec in g_main_context_iteration (context=0x7fc250000990, may_block=1) at ././glib/gmain.c:3988
#6  0x00007fc2770db51b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc27708319a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc276ea8e53 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fc276eadd78 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fc26f7d5464 in start_thread (arg=0x7fc258874700) at pthread_create.c:333
#11 0x00007fc2765b297f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7fc259a85700 (LWP 26975)):
#0  0x00007fc2765a950d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc26f2b29d6 in g_main_context_iterate (priority=<optimized out>, n_fds=1, fds=0x7fc24c022130, timeout=<optimized out>, context=0x7fc24c000990) at ././glib/gmain.c:4226
#2  0x00007fc26f2b29d6 in g_main_context_iterate (context=context@entry=0x7fc24c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3922
#3  0x00007fc26f2b2aec in g_main_context_iteration (context=0x7fc24c000990, may_block=1) at ././glib/gmain.c:3988
#4  0x00007fc2770db51b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc27708319a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc276ea8e53 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc27c0e6525 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007fc276eadd78 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fc26f7d5464 in start_thread (arg=0x7fc259a85700) at pthread_create.c:333
#10 0x00007fc2765b297f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7fc25b0c9700 (LWP 26974)):
#0  0x00007fc2765a950d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fc2704ed150 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fc2704eeee9 in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fc25c5c3a79 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fc276eadd78 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc26f7d5464 in start_thread (arg=0x7fc25b0c9700) at pthread_create.c:333
#6  0x00007fc2765b297f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7fc25c820940 (LWP 26973)):
[KCrash Handler]
#6  0x00007fc27ad283c0 in  () at /usr/lib/x86_64-linux-gnu/libKF5CalendarCore.so.5
#7  0x00007fc27ad23267 in KCalCore::Calendar::setupRelations(QSharedPointer<KCalCore::Incidence> const&) () at /usr/lib/x86_64-linux-gnu/libKF5CalendarCore.so.5
#8  0x00007fc27ad648bc in KCalCore::MemoryCalendar::addIncidence(QSharedPointer<KCalCore::Incidence> const&) () at /usr/lib/x86_64-linux-gnu/libKF5CalendarCore.so.5
#9  0x00007fc27b71168a in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCalendar.so.5
#10 0x00007fc27b71e8d8 in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCalendar.so.5
#11 0x00007fc27b720382 in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCalendar.so.5
#12 0x00007fc2770b2c7c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fc27712c5e4 in QAbstractItemModel::rowsInserted(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fc27702beab in QAbstractItemModel::endInsertRows() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007fc27704d516 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007fc27704ffc5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007fc277053a59 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007fc2770b2bd9 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fc27712c5e4 in QAbstractItemModel::rowsInserted(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fc27702beab in QAbstractItemModel::endInsertRows() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007fc27704d516 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007fc27704ffc5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007fc277053a59 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007fc2770b2bd9 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007fc27712c5e4 in QAbstractItemModel::rowsInserted(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007fc27702beab in QAbstractItemModel::endInsertRows() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007fc27704d516 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007fc27704ffc5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007fc277053a59 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007fc2770b2bd9 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007fc27712c5e4 in QAbstractItemModel::rowsInserted(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007fc27702beab in QAbstractItemModel::endInsertRows() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007fc273fd07bf in  () at /usr/lib/x86_64-linux-gnu/libKF5ItemModels.so.5
#34 0x00007fc2770b2bd9 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#35 0x00007fc27712c5e4 in QAbstractItemModel::rowsInserted(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00007fc27702beab in QAbstractItemModel::endInsertRows() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007fc2791ad6f8 in Akonadi::EntityTreeModelPrivate::itemsFetched(long long, QVector<Akonadi::Item> const&) () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#38 0x00007fc2791ad974 in Akonadi::EntityTreeModelPrivate::itemsFetched(QVector<Akonadi::Item> const&) () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#39 0x00007fc2770b2bd9 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x00007fc279156942 in Akonadi::ItemFetchJob::itemsReceived(QVector<Akonadi::Item> const&) () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#41 0x00007fc27915849c in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#42 0x00007fc2791604e5 in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#43 0x00007fc279161269 in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#44 0x00007fc2770b3729 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#45 0x00007fc2779c1bec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#46 0x00007fc2779c708f in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#47 0x00007fc277085450 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#48 0x00007fc2770873cc in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#49 0x00007fc2770db0f3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#50 0x00007fc26f2b27d7 in g_main_context_dispatch (context=0x7fc2540016f0) at ././glib/gmain.c:3201
#51 0x00007fc26f2b27d7 in g_main_context_dispatch (context=context@entry=0x7fc2540016f0) at ././glib/gmain.c:3854
#52 0x00007fc26f2b2a40 in g_main_context_iterate (context=context@entry=0x7fc2540016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3927
#53 0x00007fc26f2b2aec in g_main_context_iteration (context=0x7fc2540016f0, may_block=1) at ././glib/gmain.c:3988
#54 0x00007fc2770db4ff in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#55 0x00007fc27708319a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#56 0x00007fc27708b99c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#57 0x0000000000411b54 in  ()
#58 0x00007fc2764ea2b1 in __libc_start_main (main=0x411680, argc=1, argv=0x7fffdf748848, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffdf748838) at ../csu/libc-start.c:291
#59 0x0000000000411d79 in _start ()

Reported using DrKonqi