(In reply to Alex Deucher from comment #3)
> More likely a bug in the mesa OpenCL code.  If you want functional OpenCL,
> you should use the ROCm OpenCL packages.

Do you mean "Mesa OpenCL is not supported/unmaintained"?

I still can't get any OpenCL application to work (even "Hello World" examples).

Mesa 18.3.4, 19.0.x - GPU hangs then resets. But judging by power consumption
(hwmon, 70W - higher than usual idle power consumption) GPU continues to do
something even after reset

Mesa 19.1.x, git master - GPU doesn't hang but applications themselves hang on
the first clFinish. Power consumption stays higher than typical idle power
again.

Building ROCm from source is a huge pain.