Application: akonadi_baloo_indexer (4.14)
KDE Platform Version: 4.14.30
Qt Version: 4.8.7
Operating System: Linux 4.10.0-38-generic x86_64
Distribution: Ubuntu 17.04

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

baloo indexing agent crashes all the time.
Very often I cannot access new e-mail - when clicking on it Kontact says something about "Folder reading ...." and nothing happened. Old e-mails are accessible.
I need to start Akonadiconsole , clear akonadi cache on malfunctioned folder, restart indexing agent and Kontact, too.
Usually it helps but not always.

The crash can be reproduced every time.

-- Backtrace:
Application: No such method 'agentName' in interface 'org.freedesktop.Akonadi.AgentManager' at object path '/AgentManager' (signature 'ss') (akonadi_baloo_indexer), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[KCrash Handler]
#6  0x00007f0adab1a77f in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
#7  0x00007f0adab1c37a in __GI_abort () at abort.c:89
#8  0x00007f0ade6fdf15 in qt_message_output(QtMsgType, char const*) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007f0add230cc7 in  () at /usr/lib/libakonadi-kde.so.4
#10 0x00007f0add23018a in  () at /usr/lib/libakonadi-kde.so.4
#11 0x00007f0ade832d11 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#12 0x00007f0adbd7103c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#13 0x00007f0adbd77f76 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#14 0x00007f0adcad5f5a in KApplication::notify(QObject*, QEvent*) () at /usr/lib/libkdeui.so.5
#15 0x00007f0ade8188ad in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#16 0x00007f0ade81c366 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#17 0x00007f0ade84909e in  () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#18 0x00007f0ada1dd377 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f0ada1dd5e0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f0ada1dd68c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f0ade84920e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#22 0x00007f0adbe1e666 in  () at /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#23 0x00007f0ade81712f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#24 0x00007f0ade817495 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#25 0x00007f0ade81d459 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#26 0x00007f0add22d43d in Akonadi::AgentBase::init(Akonadi::AgentBase*) () at /usr/lib/libakonadi-kde.so.4
#27 0x000055e2fb22b1f3 in  ()
#28 0x00007f0adab053f1 in __libc_start_main (main=0x55e2fb2243a0, argc=3, argv=0x7fffdca65288, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffdca65278) at ../csu/libc-start.c:291
#29 0x000055e2fb22445a in _start ()

Reported using DrKonqi