Application: akonadi_baloo_indexer (4.14)
KDE Platform Version: 4.14.30
Qt Version: 4.8.7
Operating System: Linux 4.10.0-22-lowlatency x86_64
Distribution: Ubuntu 17.04

-- Information about the crash:
several prblems starting akonadi:

org.kde.pim.akonadi_search_xapian: Could not obtain lock for Xapian Database. This is bad
org.kde.pim.akonadicontrol: Agent instance "akonadi_baloo_indexer" has no interface!
org.kde.pim.akonadicontrol: Agent instance "akonadi_baloo_indexer" has no interface!
akonadi_baloo_indexer(9079): Could not obtain lock for Xapian Database. This is bad 
akonadi_baloo_indexer(9079): "DatabaseLockError" "DatabaseLockError: Unable to get write lock on /home/werner/.local/share/baloo/notes/: already locked" 
akonadi_baloo_indexer(9079): "DatabaseLockError" "DatabaseLockError: Unable to get write lock on /home/werner/.local/share/baloo/calendars/: already locked" 
akonadi_baloo_indexer(9079)/libakonadi: Unable to register service "org.freedesktop.Akonadi.Agent.akonadi_baloo_indexer" at dbus: "" 
KCrash: Application 'akonadi_baloo_indexer' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
KCrash: Connect sock_file=/home/werner/.kde/socket-mobiLX/kdeinit4__0
org.kde.pim.akonadicontrol: ProcessControl: Application "/usr/bin/akonadi_baloo_indexer" stopped unexpectedly ( "Der Prozess ist abgestürzt" )
org.kde.pim.akonadicontrol: Application '/usr/bin/akonadi_baloo_indexer' crashed! 1 restarts left.
QProcess: Destroyed while process ("/usr/bin/akonadi_baloo_indexer") is still running.
org.kde.pim.akonadicontrol: ProcessControl: Application "/usr/bin/akonadi_baloo_indexer" stopped unexpectedly ( "Der Prozess ist abgestürzt" )
org.kde.pim.akonadicontrol: Application '/usr/bin/akonadi_baloo_indexer' crashed! 0 restarts left.
akonadi_baloo_indexer(9197): "DatabaseLockError" "DatabaseLockError: Unable to get write lock on /home/werner/.local/share/baloo/email/: already locked" 
akonadi_baloo_indexer(9197): "DatabaseLockError" "DatabaseLockError: Unable to get write lock on /home/werner/.local/share/baloo/emailContacts/: already locked" 
akonadi_baloo_indexer(9197): Could not obtain lock for Xapian Database. This is bad 
akonadi_baloo_indexer(9197): "DatabaseLockError" "DatabaseLockError: Unable to get write lock on /home/werner/.local/share/baloo/notes/: already locked" 
akonadi_baloo_indexer(9197): "DatabaseLockError" "DatabaseLockError: Unable to get write lock on /home/werner/.local/share/baloo/calendars/: already locked" 
akonadi_baloo_indexer(9197)/libakonadi: Unable to register service "org.freedesktop.Akonadi.Agent.akonadi_baloo_indexer" at dbus: "" 
KCrash: Application 'akonadi_baloo_indexer' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
KCrash: Connect sock_file=/home/werner/.kde/socket-mobiLX/kdeinit4__0

The crash can be reproduced every time.

-- Backtrace:
Application:  (akonadi_baloo_indexer), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[KCrash Handler]
#6  0x00007f4311fc377f in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
#7  0x00007f4311fc537a in __GI_abort () at abort.c:89
#8  0x00007f4315ba6f15 in qt_message_output(QtMsgType, char const*) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007f43146d9cc7 in  () at /usr/lib/libakonadi-kde.so.4
#10 0x00007f43146d918a in  () at /usr/lib/libakonadi-kde.so.4
#11 0x00007f4315cdbd11 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#12 0x00007f431321a03c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#13 0x00007f4313220f76 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#14 0x00007f4313f7ef5a in KApplication::notify(QObject*, QEvent*) () at /usr/lib/libkdeui.so.5
#15 0x00007f4315cc18ad in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#16 0x00007f4315cc5366 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#17 0x00007f4315cf209e in  () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#18 0x00007f4311686377 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f43116865e0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f431168668c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f4315cf220e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#22 0x00007f43132c7666 in  () at /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#23 0x00007f4315cc012f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#24 0x00007f4315cc0495 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#25 0x00007f4315cc6459 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#26 0x00007f43146d643d in Akonadi::AgentBase::init(Akonadi::AgentBase*) () at /usr/lib/libakonadi-kde.so.4
#27 0x000056377cab11f3 in  ()
#28 0x00007f4311fae3f1 in __libc_start_main (main=0x56377caaa3a0, argc=3, argv=0x7fff64cac048, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff64cac038) at ../csu/libc-start.c:291
#29 0x000056377caaa45a in _start ()

Reported using DrKonqi