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Update libFuzzer fuzz instructions #3705

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Apr 4, 2025
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Update libFuzzer fuzz instructions #3705

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1 change: 1 addition & 0 deletions fuzz/README.md
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Expand Up @@ -61,6 +61,7 @@ To run fuzzing using `cargo-fuzz / libFuzzer`, run

```shell
rustup install nightly # Note: libFuzzer requires a nightly version of rust.
export RUSTFLAGS="--cfg=fuzzing --cfg=secp256k1_fuzz --cfg=hashes_fuzz"
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I ran into this as well, but it seems I don't need to add --cfg=fuzzing. Does it work for you without that?

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cargo fuzz should add cfg=fuzzing automatically for us, but it also doesn't really hurt for us to add it manually. Its also required when running cargo test in the fuzz crate, so IMO its fine to have it be explicit.

cargo +nightly fuzz run --features "libfuzzer_fuzz" msg_ping_target
```
Note: If you encounter a `SIGKILL` during run/build check for OOM in kernel logs and consider
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