(In reply to Michel Dänzer from comment #2)
> (In reply to Sebastian Parborg from comment #0)
> > [...] there seems to be some kind of cached behaviour (not the mesa shader
> > cache as I removed the directory [...]
> 
> Which directory exactly did you remove? Have you tried setting the
> environment variable MESA_GLSL_CACHE_DISABLE=true to see if that avoids the
> problem?

I removed "~/.cache/mesa_shader_cache". I tried that environment variable now
and it doesn't seem to solve it either for me (with mesa from 2017-12-01)...

I really do not know how I should try to bisect this...