Steps to reproduce:

1. Open attached project
2. Open scene "repro3"
3. Do some actions in scene view that would cause it repaint (scroll mouse wheel, move or rotate camera, search in hierarchy) for about a minute (though it should crash earlier than that)

Note: you can also open up activity monitor's memory panel and track how memory starts to build up there.

Reproduced with: 2018.1.0a2
Not reproducible: 2018.1.0a1