Steps to reproduce:
1) Download and open attached project "Deferred Renderer.zip"
2) Open and play "Test Scene"

Actual result: Crash
Expected: Sphere is rendered and Unity doesn't crash

Note: It crashes while using RenderTextureFormat.RFloat for Command Buffer in file TestForwardBuffer.cs line 42

The two cameras should be on top of each other. HDR is on for both. They both clear to color. The deferred-rendered camera (the main camera) should have its culling mask set to something not found in the scene (because setting it to none prevents scene from doing the lighting passes).

Tested and reproduced on:
Windows 10
Unity 5.6.0f3, 2017.1.0b1

Could not test prior because due to missing API's