Comment # 36 on bug 91278 from Mathias Tillman

I have run the valley test the entire day (10 hours or so) without a single VM
fault or hang with the GPU scheduler enabled on 4.4.

Re-ran the test with your (Grazvydas) patch and it's showing the same symptoms
as before when not using the schedluer - that is, a bunch of VM faults, which
lead to a hang after around 30 minutes or so.