This issue still exists with latest x11-server 1.19.0 and Mesa 13.0.2 and
Plasma 5.8.4

I got this in logs:

gru 10 13:31:37 lazur kernel: nouveau 0000:01:00.0: fifo: DMA_PUSHER - ch 17
[plasmashell[8353]] get 0020117b08 put 0020129744 ib_get 00000059 ib_put
0000005a state 80007088 (err: INVALID_CMD) push 00406040
gru 10 13:31:40 lazur PackageKit[4860]: get-updates transaction /1645_dbadbbda
from uid 1001 finished with success after 3316ms
gru 10 13:31:41 lazur systemd-coredump[8355]: Failed to generate stack trace:
(null)
gru 10 13:31:41 lazur systemd-coredump[8355]: Process 8306 (plasmashell) of
user 1001 dumped core.