Reproduction steps with a project:
1. Open attached project "AscensionCrashTest"
2. Open scene "Main"
3. Run the game

Notes:
1. Crashes so hard that Bug Reporter won't open
2. Replacing string allocation with Debug.Log() causes unity to hang, similar to an infinite loop
3. Removing allocation (simply calling itself and nothing more) causes stack overflow exception. No crash

Script that causes a crash:

void Start () {
KillCreator ();
}

void KillCreator() {
string[] /*moms*/ spaghetti = new string[10];
KillCreator ();
}