Ubuntu 16.04 64 bits Nvidia Titan Black
Broken: 2.79 and master f34e03d
Short description of error
When 3D View uses Material viewport shading type, if a Group Output node of a nodegroup that is connected to Displacement socket of Material Output node is deleted : Blender crashes.
It does not happen if viewport shading type is different or if connection to Displacement socket is undone.
Bug reported on iirc and blender.stackexchange
Exact steps for others to reproduce the error
In attached .blend file, delete Group Output node.