Steps to reproduce :

- start Unity using in OpenGL mode
- import the project attached
- open the scene
- press play and Unity will crash

Steps to reproduce without example project :

- use MeshFilter.mesh to make a copy of a mesh to be modified
- assign a new triangles array that has at least 1 triangle more than the original one (it does not matter if Mesh.Clear is called or not)
- try to render the resulting mesh using Graphics.DrawMesh to a RenderTexture later in an Update call