Comment # 27 on bug 106258 from Christian König

(In reply to Ben Crocker from comment #26)
> foxbat, thanks for posting this!
> 
> > [  175.501965] [drm] size=167768376 > sa_manager->size=1048576
> 
> Well, isn't THAT interesting!
> Requested size is ALMOST, but not quite, 160 MB, while what
> the sub-allocation manager has left is 1 MB.

Sounds like we have an overrun in amdgpu_vm_bo_update_mapping() while
calculating how many bytes we need to allocate from the sa_manager.