Comment # 17 on bug 104362 from Marek Olšák

(In reply to nmr from comment #15)
> Marek forgive my ignorance but why would SGPR spilling or branching cause
> the hang? Is the shader just timing out somehow and the timeout resulting in
> a kernel module abort?

Pretty much. The shader is stuck and doesn't continue. Also the shader is
insanely huge with lots of SGPR spilling and branching.