[Mesa-dev] [PATCH 0/2] i965: scratch space fixes

[Rogovin, Kevin]

> These patches fix GPU hangs I'm seeing also with the *GL* version of 
> CarChase on KBL GT3e, when using Ubuntu 16.04 kernel.

> NOTE: those hangs don't happen when doing tests with latest drm-tip 
> kernel.  Besides the older Ubuntu kernel, I'm seeing hangs also with the 
> 4.13 drm-tip kernel, but these have happened only since early November 
> version of Mesa.

Chances are it is caused by that the out-of-bounds overwrites in older kernels landed in the scratch page; it is essentially just luck of the out-of-bounds write lands in scratch or someplace important where corrupted data hangs the GPU (for example the memory holding the GEN shaders).

-Kevin