Explaining Hyperproperty Violations

Norine Coenen, Raimund Dachselt, Bernd Finkbeiner, Hadar Frenkel, Christopher Hahn, Tom Horak, Niklas Metzger, and Julian Siber

Hyperproperties relate multiple computation traces to each other. Model checkers for hyperproperties thus return, in case a system model violates the specification, a set of traces as a counterexample. Fixing the erroneous relations between traces in the system that led to the counterexample is a difficult manual effort that highly benefits from additional explanations. In this paper, we present an explanation method for counterexamples to hyperproperties described in the specification logic HyperLTL. We extend Halpern and Pearl’s definition of actual causality to sets of traces witnessing the violation of a HyperLTL formula, which allows us to identify the events that caused the violation. We report on the implementation of our method and show that it significantly improves on previous approaches for analyzing counterexamples returned by HyperLTL model checkers.

34th International Conference on Computer Aided Verification (CAV 2022).

The paper will be presented at CAV 2022 which is part of FLoC 2022. The publication is available on ArXiV.

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