Synchronizability of Communicating Finite State Machines is not Decidable

Alain Finkel (1) , Etienne Lozes (1, 2)

1 LSV - Laboratoire Spécification et Vérification [Cachan]
2 Laboratoire I3S - COMRED - COMmunications, Réseaux, systèmes Embarqués et Distribués

A system of communicating finite state machines is synchronizable if its send trace semantics, i.e. the set of sequences of sendings it can perform, is the same when its communications are FIFO asynchronous and when they are just rendez-vous synchronizations. This property was claimed to be decidable in several conference and journal papers for either mailboxes or peer-to-peer communications, thanks to a form of small model property. In this paper, we show that this small model property does not hold neither for mailbox communications, nor for peer-to-peer communications, therefore the decidability of synchronizability becomes an open question. We close this question for peer-to-peer communications, and we show that synchronizability is actually undecidable. We show that synchronizability is decidable if the topology of communications is an oriented ring. We also show that, in this case, synchronizability implies the absence of unspecified receptions and orphan messages, and the channel-recognizability of the reachability set.

Mots clés: choreographies; asynchronous communications; distributed system; verification

Domaines: Calcul parallèle, distribué et partagé [cs.DC]; Théorie et langage formel [cs.FL]

Alain Finkel, Etienne Lozes. Synchronizability of Communicating Finite State Machines is not Decidable. 2018. ⟨hal-01474722v5⟩