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Authored by Anh Nguyen-Tuong

afl initial error messages

[-] Hmm, your system is configured to send core dump notifications to an external utility. This will cause issues: there will be an extended delay between stumbling upon a crash and having this information relayed to the fuzzer via the standard waitpid() API.

To avoid having crashes misinterpreted as timeouts, please log in as root
and temporarily modify /proc/sys/kernel/core_pattern, like so:

echo core >/proc/sys/kernel/core_pattern

[-] PROGRAM ABORT : Pipe at the beginning of 'core_pattern' Location : check_crash_handling(), afl-fuzz.c:7275

TEST FAIL: ./gzip.stars.zafl: unable to run with afl

Edited
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  • Yet another afl setup issue:

    [-] Whoops, your system uses on-demand CPU frequency scaling, adjusted between 1558 and 2338 MHz. Unfortunately, the scaling algorithm in the kernel is imperfect and can miss the short-lived processes spawned by afl-fuzz. To keep things moving, run these commands as root:

    cd /sys/devices/system/cpu
    echo performance | tee cpu*/cpufreq/scaling_governor
    
    You can later go back to the original state by replacing 'performance' with
    'ondemand'. If you don't want to change the settings, set AFL_SKIP_CPUFREQ
    to make afl-fuzz skip this check - but expect some performance drop.
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