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by The_rationalist 1960 days ago
Very interesting, thanks! It's seems like a great Idea to reuse libFuzzer, I just hope that the JNI overhead isn't too big.

Openjdk 16 has https://openjdk.java.net/jeps/389 But it's not obvious if it improve performance

1 comments

Thanks for the link, I wasn't aware of this new feature!

Our coverage instrumentation does not rely on JNI calls, only the libFuzzer callbacks do, so the overhead shouldn't be too substantial. It's certainly not a proper benchmark, but one core on my laptop can fuzz the more non-trivial examples at around 10,000 exec/s. We are also working on some further performance improvements.