Is export FZDEBUG=repro=1 only useful for chained fuzzers?

[jasikpark]

When running the reproduction with a regular generated fuzzer, I only get a backtrace, rather than having the full code used like shown in the README / that I was able to replicate in the parallel+chain tutorial in the readme

func Fuzz_TimerWheel_NewTimerWheel(f *testing.F) {
	f.Fuzz(func(t *testing.T, data []byte) {
		var min time.Duration
		var max time.Duration
		fz := fuzzer.NewFuzzer(data)
		fz.Fill(&min, &max)

		NewTimerWheel(min, max)
	})
}

doesn't produce a length test description.. I suppose maybe it wouldn't, since presumably it's just a single function call?

[thepudds]

Hi @jasikpark, thank you for filing this.

Yes, right now setting the environment variable FZDEBUG=repro=1 only is helpful for chained functions (e.g., as generated by fzgen -chain), such as this example in the README.

As you implied, that is where it is most useful, especially given there can be a potentially intricate series of calls needed to produce bad behavior.

However, it would be nice to also do something minimal even if it is not a chained function, so we can keep this issue open to track that.