What does the signal and max signal mean?

[Joey Jiao]

Hi,

I'm a little bit confusion about the signal 30975/46126. What does it really stands for?

If cover 15642 doesn't increase but signal keeps change, does it mean it's likely will find new cover?

2022/06/16 19:31:48 VMs 8, executed 1799481, cover 15642, signal 30975/46126, crashes 1, repro 0

THX

Joey

[Dmitry Vyukov]

"cover" is basic-block coverage, it directly maps to the number of
compiler-emitted coverage callbacks.
"signal" is currently coverage control-flow-graph edges (parts of
adjacent basic blocks).
"max signal" is signal that also includes a flaky signal (e.g. mutex
lock slow path coverage that was observed on some input, but not
reproduced reliably).

[Dmitry Vyukov]

On Fri, 17 Jun 2022 at 12:09, Dmitry Vyukov <dvy...@google.com> wrote:
>
> On Thu, 16 Jun 2022 at 13:34, Joey Jiao <joey....@gmail.com> wrote:
> >
> > Hi,
> > I'm a little bit confusion about the signal 30975/46126. What does it really stands for?
> > If cover 15642 doesn't increase but signal keeps change, does it mean it's likely will find new cover?

If signal (not max signal) grow, then it means we found new coverage.
The corpus size should also grow in this case.