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Add more debugging tips (#3056)

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* add more debugging tips

* fixer
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Dongjia "toka" Zhang 2025-03-07 23:42:13 +01:00 committed by GitHub
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docs/src/DEBUGGING.md
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@ -15,6 +15,11 @@ In this case, again, what usually should do is to run the fuzzer with gdb and se
## Q. I started the fuzzer but there's no output. ## Q. I started the fuzzer but there's no output.
First, verify that your stdout and stderr are not redirected to `/dev/null`. If you get the log, then it should either fall into the previous 2 cases. Either the fuzzer crashed because you didn't have the initial seeds, or the coverage feedback is not working. First, verify that your stdout and stderr are not redirected to `/dev/null`. If you get the log, then it should either fall into the previous 2 cases. Either the fuzzer crashed because you didn't have the initial seeds, or the coverage feedback is not working.
## Q. I don't see any output from my fuzzer (println!() or logging)
First, check that you are not redirecting things to `/dev/null` else you will see nothing.
To see the log that you added with `log::trace!();`, you need to initialize the logger (any logger, `env_logger` or `SimpleStdoutLogger` from `libafl_bolts`) before the fuzzer starts.
Also you have to make sure that you are runing with `RUST_LOG=<log_level>` and you are *NOT* using `release_max_level_info` feature of `log` crate in your `Cargo.toml` of your fuzzer
## Q. My fuzzer is slow. ## Q. My fuzzer is slow.
Try running the fuzzer with the `introspection` feature of the `libafl`. This will show how much time is spent on each module of your fuzzer. Also you might be using a wrong size of the coverage map. If you see `2621440` for the size of the coverage map, you are doing it wrong. One possible mistake is the misuse of `libafl_targets::coverage::EDGES_MAP` Try running the fuzzer with the `introspection` feature of the `libafl`. This will show how much time is spent on each module of your fuzzer. Also you might be using a wrong size of the coverage map. If you see `2621440` for the size of the coverage map, you are doing it wrong. One possible mistake is the misuse of `libafl_targets::coverage::EDGES_MAP`
``` ```