970 SC 4GB.
Ubuntu 18.04 LTS
Short description of error
Crash when stopping a Cycles render with denoising.
When start rendering on cycles with nodes the render will repeat twice and the composite nodes from the renderview will dissapear leaving the composite and renderview disconected.
Cancelling the render on mid-way will end on a frozen crash.
Exact steps for others to reproduce the error
Open blender with cycles render and composite with renders
connect 'composite' and 'renderview' in both view and alpha
start rendering the picture, it should render twice and then the nodes will be fully diconected and no picture on renderview and a black screen on the 'combined' render.
Stopping the render with ESC will freeze-crash blender.