This is the fastest pintool afl-fuzzer out there currently. And it runs with pintool 3.6, so 4.x x64 kernels are fine. But ... pintool is super slow. So this is basically only if you have no other option. I am currently developing an alternative with DynamoRIO and is 10x faster - but still, afl qemu mode is 5-10x faster than that ... When you have no source code, normal afl-dyninst is crashing the binary, qemu mode -Q is not an option and dynamorio is not working either. Pin is even 90% slower than my dynamorio implementation ...