What is ft in libFuzzer?

[taotao gu]

Helllo all,

I have a question about the 'ft' metric in libfuzzer, I have recently run several libfuzzers with different strategies, and the cov in the xml of libxml2 is similar, but the ft is very different, and the more 'ft'  fuzzer found a crash.
Could you please tell me where is the code introduction related to ft? Could you guide me

Thanks.

[Konstantin Serebryany]

'ft' stands for "features", i.e. any kind of signal we get from the execution. 

One kind of features is the control flow coverage ("cov"), but there are others, 

e.g. the ones we derive from instrumenting CMP instructions. 

hth

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[taotao gu]

Thanks very much!