(In reply to Kelly Anderson from comment #18)
> This bug did not affect 4.6.x and earlier, it started with:
> 
> commit 70eced9b2e05f38274ebe8ad91c472bb684fa82a
> 
> That commit enables new features on the Carrizo,
> 
> -		adev->cg_flags = 0;
> +		adev->cg_flags = AMD_CG_SUPPORT_GFX_MGCG |
> +			AMD_CG_SUPPORT_GFX_MGLS |
> +			AMD_CG_SUPPORT_GFX_RLC_LS |
> +			AMD_CG_SUPPORT_GFX_CP_LS |
> +			AMD_CG_SUPPORT_GFX_CGTS |
> +			AMD_CG_SUPPORT_GFX_MGLS |
> +			AMD_CG_SUPPORT_GFX_CGTS_LS |
> +			AMD_CG_SUPPORT_GFX_CGCG |
> +			AMD_CG_SUPPORT_GFX_CGLS;
> 
> So it should be relatively easy to isolate the problem by stepping through
> those features one by one to isolate which of those flags is triggering the
> problem.
> 
> I'm available to test semi-official patches until the problem is properly
> fixed.  In the meantime I've reverted the patch on my 4.7.6 kernel and have
> run for over two days without encountering the problem.

I tried 4.6, 4.5 and 4.4 kernels and all stable releases had this issue. Only
some 4.5 rc releases work for me.