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A counter-example guided abstraction refinement scheme for parameterized verification


Dr. Ahemed Rezine, Uppsala university



Start time:

2010-11-25 11:15

End time:

2010-11-25 12:15



Contact person:


I will introduce ''monotonic abstraction'' as an approach to verify systems with an arbitrary number of concurrent and communicating processes, i.e., parameterized systems. Monotonic abstraction is particularly successful in automatic verification of safety properties for parameterized systems. The main drawback is that it sometimes generates spurious counter-examples.I will describe a counterexample-guided abstraction refinement (CEGAR) framework for monotonic abstraction. The CEGAR algorithm automatically extracts from each spurious counterexample a set of configurations called a “Safety Zone”and uses it to refine the abstract transition system of the next iteration. This approach gave encouraging results and allowed the verification of several parameterized systems.