Operating system and graphics card
Win 10 64 bit; 24 gigs RAM; ATI HD 7xxx GPU; Third-gen i7 processor
Broken: hash cefbe8f
Worked: hash 24712b1 (June 1)
Short description of error
Rendering various scenes in extremely new Cycles builds will now cause Blender to quit when the actual render starts (something which might be caused by the newest nodification commit from Brecht).
Exact steps for others to reproduce the error
Open the .blend and try to render the scene, watch Blender quit to desktop.