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Recently, a detailed epistemic reasoning framework for multi-agent systemswith byzantine faulty asynchronous agents and possibly unreliable communicationwas introduced. We have developed a modular extension framework implemented ontop of it, which allows to encode and safely combine additional systemassumptions commonly used in the modeling and analysis of fault-tolerantdistributed systems, like reliable communication, time-bounded communication,multicasting, synchronous and lock-step synchronous agents and even agents withcoordinated actions. We use this extension framework for analyzing basicproperties of synchronous and lock-step synchronous agents, such as the agents'local and global fault detection abilities. Moreover, we show that even theperfectly synchronized clocks available in lock-step synchronous systems cannotbe used to avoid "brain-in-a-vat" scenarios.

The Persistence of False Memory: Brain in a Vat Despite Perfect Clocks