Error: no crash detected

[xxrz]

Hello, I would like to ask what does "Error: no crash detected" mean? Is it because the test cases generated by AFL cannot trigger bugs, or am I not using crashwalk correctly?

[Sandr0x00]

You can test yourself if they trigger bugs, by triaging some of them manually in GDB.

[kimiwanano]

I have the same error, did you have resolved that？

[bnagy]

[NB I haven’t looked at this for years, I am essentially out of infosec]

If the software isn’t broken, this error means that the case didn’t crash under repro. It may be that it’s intermittent or it might just not be a crash (long story, but can happen). Final possibility is that it doesn’t crash under a debugger, but does under AFL instrumentation.

The kinds of bugs this software can have to cause false negatives like this are limited, but not impossible. Most likely, though, it’s something else. :)

[kimiwanano]

Got it! Thanks!