Just going through my journal (journalctl --since "2016-08-30 08:00" | grep dumped) and i get a lot of these for one days work.  I don;t know how to generate the problem.

Aug 30 08:09:07 LianLi systemd-coredump[5633]: Process 1339 (kactivitymanage) of user 1004 dumped core.
Aug 30 08:12:31 LianLi systemd-coredump[6757]: Process 5852 (kactivitymanage) of user 1004 dumped core.
Aug 30 09:20:37 LianLi systemd-coredump[3244]: Process 2137 (akonadi_maildir) of user 1004 dumped core.
Aug 30 11:15:26 LianLi systemd-coredump[6335]: Process 6328 (QtWebEngineProc) of user 1004 dumped core.
Aug 30 11:18:11 LianLi systemd-coredump[6618]: Process 1368 (kactivitymanage) of user 1004 dumped core.
Aug 30 11:37:26 LianLi systemd-coredump[8841]: Process 6838 (kactivitymanage) of user 1004 dumped core.
Aug 30 12:41:05 LianLi systemd-coredump[20180]: Process 18349 (kactivitymanage) of user 1004 dumped core.
Aug 30 16:12:42 LianLi systemd-coredump[4129]: Process 1327 (kactivitymanage) of user 1004 dumped core.
Aug 30 16:52:52 LianLi systemd-coredump[4889]: Process 3951 (kactivitymanage) of user 1004 dumped core.
Aug 30 20:30:05 LianLi systemd-coredump[16087]: Process 14635 (kactivitymanage) of user 1004 dumped core.

Reproducible: Always

Steps to Reproduce:
1. I don't know how to reproduce, kmail2 (v5.3.0) is crashing at will at the moment so maybe its related.
2.
3.


Expected Results:  
No core dumps