License: Creative Commons Attribution 4.0 International license (CC BY 4.0)
When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.CONCUR.2022.35
URN: urn:nbn:de:0030-drops-170982
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Barwell, Adam D. ; Scalas, Alceste ; Yoshida, Nobuko ; Zhou, Fangyi

Generalised Multiparty Session Types with Crash-Stop Failures

LIPIcs-CONCUR-2022-35.pdf (1 MB)


Session types enable the specification and verification of communicating systems. However, their theory often assumes that processes never fail. To address this limitation, we present a generalised multiparty session type (MPST) theory with crash-stop failures, where processes can crash arbitrarily.
Our new theory validates more protocols and processes w.r.t. previous work. We apply minimal syntactic changes to standard session π-calculus and types: we model crashes and their handling semantically, with a generalised MPST typing system parametric on a behavioural safety property. We cover the spectrum between fully reliable and fully unreliable sessions, via optional reliability assumptions, and prove type safety and protocol conformance in the presence of crash-stop failures.
Introducing crash-stop failures has non-trivial consequences: writing correct processes that handle all crash scenarios can be difficult. Yet, our generalised MPST theory allows us to tame this complexity, via model checking, to validate whether a multiparty session satisfies desired behavioural properties, e.g. deadlock-freedom or liveness, even in presence of crashes. We implement our approach using the mCRL2 model checker, and evaluate it with examples extended from the literature.

BibTeX - Entry

  author =	{Barwell, Adam D. and Scalas, Alceste and Yoshida, Nobuko and Zhou, Fangyi},
  title =	{{Generalised Multiparty Session Types with Crash-Stop Failures}},
  booktitle =	{33rd International Conference on Concurrency Theory (CONCUR 2022)},
  pages =	{35:1--35:25},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-246-4},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{243},
  editor =	{Klin, Bartek and Lasota, S{\l}awomir and Muscholl, Anca},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{},
  URN =		{urn:nbn:de:0030-drops-170982},
  doi =		{10.4230/LIPIcs.CONCUR.2022.35},
  annote =	{Keywords: Session Types, Concurrency, Failure Handling, Model Checking}

Keywords: Session Types, Concurrency, Failure Handling, Model Checking
Collection: 33rd International Conference on Concurrency Theory (CONCUR 2022)
Issue Date: 2022
Date of publication: 06.09.2022
Supplementary Material: Software (Source Code): archived at:

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