Comment # 1 on bug 109329 from Jan Vesely

(In reply to Fabian Maurer from comment #0)
> Created attachment 143077 [details]
> journalctl log
> 
> Running luxmark (OpenCL) freezes the system.
> Only help is to reboot with REISUB command.
> 
> dmesg log (from journalctl) attached.
> 
> System:
> -Arch Linux
> -AMD Radeon 285
> -AMD Radeon R9 200 Series (TONGA, DRM 3.27.0, 4.20.1-arch1-1-ARCH, LLVM
> 7.0.0)
> -Mesa 18.3.1

which scene are you trying to run?