Sorry to post into this already closed bug.

Should this issue be fixed in 4.17.12?

I am asking because I see sporadic system hangs that start with these messages:

Aug 09 08:20:18 thinkpad kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR*
ring sdma0 timeout, last signaled seq=2260291, last emitted seq=2260293
Aug 09 08:20:18 thinkpad kernel: [drm] No hardware hang detected. Did some
blocks stall?
Aug 09 08:20:35 thinkpad kernel: watchdog: BUG: soft lockup - CPU#4 stuck for
22s! [kwin_x11:915]

Sounds similar to this bug.