Despite several decades of research, the problem of formal verification of infinite-state systems has resisted effective automation. We describe a system — Ivy — for interactively verifying safety of infinite-state systems. Ivy’s key principle is that whenever verification fails, Ivy graphically displays a concrete counterexample to induction. The user then interactively guides generalization from this counterexample. This process continues until an inductive invariant is found. Ivy searches for universally quantified invariants, and uses a restricted modeling language. This ensures that all verification conditions can be checked algorithmically. All user interactions are performed using graphical models, easing the user’s task. We describe our initial experience with verifying several distributed protocols.
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|Cardinalities and Universal Quantifiers for Verifying Parameterized Systems|
Nikolaj Bjørner Microsoft Research, Klaus Gleissenthall Technische Universität München, Andrey Rybalchenko Microsoft ResearchMedia Attached
|Ivy: Safety Verification by Interactive Generalization|
Oded Padon Tel Aviv University, Kenneth L. McMillan Microsoft Research, Aurojit Panda , Mooly Sagiv Tel Aviv University, Sharon ShohamMedia Attached