It's not about failed attempt at finding a hole, it's about failed attempt at actually making use of a hole (i.e. write an exploit) given a hole. (FG)ASLR is m

It's not about failed attempt at finding a hole, it's about failed attempt at actually making use of a hole (i.e. write an exploit) given a hole. (FG)ASLR is more of a "targeting at exploit instead of vulnerability" style mitigation.