For some reason kactivitymanager crashes silently and leaves a message in dmesg. I don't have more details since this crash doesn't seem to affect performance that much at the moment. This might even be connected to a nvidia-driver (I'm using version 367.44).

Reproducible: Always

Steps to Reproduce:
1. Keep KDE Plasma 5.8.0 running for some time.
2. ????
3. Crash message appears in dmesg.

Actual Results:  
kactivitymanager crashes at random and is restarted.

Expected Results:  
kactivitymanager should not crash at all.

The error message from dmesg.
-----
[121954.512853] traps: ck-remove-direc[26024] trap int3 ip:7f06427135d7 sp:7ffdb38c5220 error:0
[121954.555703] kactivitymanage[9354]: segfault at 7f4cf41d1c50 ip 00007f4cf41e9071 sp 00007ffc3a9ade18 error 4 in libQt5Sql.so.5.6.1[7f4cf41d4000+42000]
[121954.957162] nvidia-modeset: Freed GPU:0 (GPU-c596bde8-99af-0bbf-bfda-49e673acdf90) @ PCI:0000:01:00.0
[121955.391324] nvidia-modeset: Allocated GPU:0 (GPU-c596bde8-99af-0bbf-bfda-49e673acdf90) @ PCI:0000:01:00.0
[121967.496527] traps: ck-remove-direc[26067] trap int3 ip:7f38ee1a35d7 sp:7ffe67e64af0 error:0
[122621.356608] traps: ck-remove-direc[26738] trap int3 ip:7eff8ebab5d7 sp:7ffc0a670e20 error:0
[122621.364902] kactivitymanage[26227]: segfault at 7ffab1e49c50 ip 00007ffab1e61071 sp 00007fff3b686cb8 error 4 in libQt5Sql.so.5.6.1[7ffab1e4c000+42000]
[122621.776431] nvidia-modeset: Freed GPU:0 (GPU-c596bde8-99af-0bbf-bfda-49e673acdf90) @ PCI:0000:01:00.0
[122622.210805] nvidia-modeset: Allocated GPU:0 (GPU-c596bde8-99af-0bbf-bfda-49e673acdf90) @ PCI:0000:01:00.0
[123089.709593] traps: ck-remove-direc[26786] trap int3 ip:7fed81abb5d7 sp:7ffe673f9b20 error:0
[123104.581870] traps: ck-remove-direc[26826] trap int3 ip:7f8e0e6a35d7 sp:7fff65e38a20 error:0
[123112.371407] traps: ck-remove-direc[26840] trap int3 ip:7f412ebc35d7 sp:7ffc5a32b540 error:0
[123141.342976] traps: ck-remove-direc[27191] trap int3 ip:7f7d54f835d7 sp:7fff88a33900 error:0
[123141.347964] kactivitymanage[27005]: segfault at 7f1d9e4d9c50 ip 00007f1d9e4f1071 sp 00007fffd10bcf08 error 4 in libQt5Sql.so.5.6.1[7f1d9e4dc000+42000]
[123141.765806] nvidia-modeset: Freed GPU:0 (GPU-c596bde8-99af-0bbf-bfda-49e673acdf90) @ PCI:0000:01:00.0
[123142.200405] nvidia-modeset: Allocated GPU:0 (GPU-c596bde8-99af-0bbf-bfda-49e673acdf90) @ PCI:0000:01:00.0
[123166.057593] traps: ck-remove-direc[27224] trap int3 ip:7f0ad3a6b5d7 sp:7ffc251a8e50 error:0
[123308.659877] traps: ck-remove-direc[27262] trap int3 ip:7f15b47bb5d7 sp:7ffd8bae01f0 error:0
[123315.099812] traps: ck-remove-direc[27276] trap int3 ip:7f3329ee35d7 sp:7ffc2ad8ae70 error:0
[125330.588056] traps: ck-remove-direc[28224] trap int3 ip:7fcc7efe35d7 sp:7ffe3261acd0 error:0
[125330.593040] kactivitymanage[27450]: segfault at 7ff5b62f1c50 ip 00007ff5b6309071 sp 00007ffc3dc49d68 error 4 in libQt5Sql.so.5.6.1[7ff5b62f4000+42000]
[125331.023700] nvidia-modeset: Freed GPU:0 (GPU-c596bde8-99af-0bbf-bfda-49e673acdf90) @ PCI:0000:01:00.0
[125331.458176] nvidia-modeset: Allocated GPU:0 (GPU-c596bde8-99af-0bbf-bfda-49e673acdf90) @ PCI:0000:01:00.0
[125343.901146] traps: ck-remove-direc[28256] trap int3 ip:7f8aea96b5d7 sp:7ffd79f39990 error:0
[125369.388120] traps: ck-remove-direc[28283] trap int3 ip:7f781a9735d7 sp:7ffd15e8f940 error:0
[125376.730157] traps: ck-remove-direc[28297] trap int3 ip:7f0589deb5d7 sp:7ffebf8455d0 error:0