Reproduction steps:

*1. Edit the Unity Networking files
2. Open "CHKN" project
*3. Decrease the size of the textures in the project (So as to make the serialized file size less than 4Gb)
4. Delete "sand_normal.png" from "CCrossWorking\SandTextures"
5. Find and click on "CHKNVirtualTexture" in the Project window -> Click "Rebuild" in the Inspector window
6. Build the Project for Mac
7. Launch the Build

Expected Result: The Build launches properly
Actual Result: The Build closes/crashes (If using -logFile, you can see that there is an error "System out of memory")

Fixed in: 2018.3.0b1

Reproduced with: 2017.4.4f1, 2017.4.3f1 (21ae32b5a9cb)
Did not reproduce on: 2017.4.3f1 (bbf84f06ea19)

Note:
*1. Add the contents of "Output.zip" to this directory "...Editor\Data\UnityExtensions\Unity\Networking"
*3. "Project Settings" -> "Quality" -> Set "Texture Quality" to "Eighth Res"

Allow Unsafe Code
Comment out any code that causes errors

Added the Output log of the build once crashed
Added the Build from 2017.4.2f2

"Could not allocate memory: System out of memory!
MemoryLabel: TempOverflow
Size overflow in allocator."

You can include just the first 2 Scenes ("Loading" and "Game" to build faster)