Besides, what's the minimum chunk size? Can't be less than the 64-bit word size can it? The chances of a random 8-byte gravestone appearing in legit memory is p

Besides, what's the minimum chunk size? Can't be less than the 64-bit word size can it? The chances of a random 8-byte gravestone appearing in legit memory is practically nil. If free() took only 1ns to run and you called it 2^64 times, that would take >500 years.