Command line used to find this crash: /home/user/evaluation/afl-fuzz/afl-fuzz -C -d -m none -i /home/user/evaluation/seed -o /home/user/evaluation/afl-workdir/ -- /home/user/evaluation/patch_fuzz -p0 -f If you can't reproduce a bug outside of afl-fuzz, be sure to set the same memory limit. The limit used for this fuzzing session was 0 B. Need a tool to minimize test cases before investigating the crashes or sending them to a vendor? Check out the afl-tmin that comes with the fuzzer! Found any cool bugs in open-source tools using afl-fuzz? If yes, please drop me a mail at once the issues are fixed - I'd love to add your finds to the gallery at: http://lcamtuf.coredump.cx/afl/ Thanks :-)