Deductive Veriication of Parameterized Fault-tolerant Systems: a Case Study ?

We present a methodology and a formal toolset for verifying fault-tolerant systems, based upon the temporal veriication system STeP. Our test case is the modeling and veriication of a parameterized fault-tolerant leader-election algorithm recently proposed in 9]. Our methods settle the general N-process correctness for the algorithm, which had been previously veriied only for N = 3. We formulate the notion of Uniform Compassion to model progress in faulty systems more faithfully, and combine it with the more standard notions of fairness. We also show how the correctness proofs generalize to diierent channel models by a reduction to a simple channel model.

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