2 Search Results for "Nagar, Kartik"

Document
Brief Announcement
DOI: 10.4230/LIPIcs.DISC.2021.48
Brief Announcement: Automating and Mechanising Cutoff Proofs for Parameterized Verification of Distributed Protocols

Authors: Shreesha G. Bhat and Kartik Nagar

Published in: LIPIcs, Volume 209, 35th International Symposium on Distributed Computing (DISC 2021)

Abstract
We propose a framework to automate and mechanize simulation-based proofs of cutoffs for parameterized verification of distributed protocols. We propose a strategy to derive the simulation relation given the cutoff instance and encode the correctness of the simulation relation as a formula in first-order logic. We have successfully applied our approach on a number of distributed protocols.
Cite as

Shreesha G. Bhat and Kartik Nagar. Brief Announcement: Automating and Mechanising Cutoff Proofs for Parameterized Verification of Distributed Protocols. In 35th International Symposium on Distributed Computing (DISC 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 209, pp. 48:1-48:4, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{bhat_et_al:LIPIcs.DISC.2021.48,
  author =	{Bhat, Shreesha G. and Nagar, Kartik},
  title =	{{Brief Announcement: Automating and Mechanising Cutoff Proofs for Parameterized Verification of Distributed Protocols}},
  booktitle =	{35th International Symposium on Distributed Computing (DISC 2021)},
  pages =	{48:1--48:4},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-210-5},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{209},
  editor =	{Gilbert, Seth},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2021.48},
  URN =		{urn:nbn:de:0030-drops-148505},
  doi =		{10.4230/LIPIcs.DISC.2021.48},
  annote =	{Keywords: Formal Methods, Automated Verification, Distributed Protocols}
}
Document
DOI: 10.4230/LIPIcs.CONCUR.2018.41
Automated Detection of Serializability Violations Under Weak Consistency

Authors: Kartik Nagar and Suresh Jagannathan

Published in: LIPIcs, Volume 118, 29th International Conference on Concurrency Theory (CONCUR 2018)

Abstract
While a number of weak consistency mechanisms have been developed in recent years to improve performance and ensure availability in distributed, replicated systems, ensuring the correctness of transactional applications running on top of such systems remains a difficult and important problem. Serializability is a well-understood correctness criterion for transactional programs; understanding whether applications are serializable when executed in a weakly-consistent environment, however remains a challenging exercise. In this work, we combine a dependency graph-based characterization of serializability and leverage the framework of abstract executions to develop a fully-automated approach for statically finding bounded serializability violations under any weak consistency model. We reduce the problem of serializability to satisfiability of a formula in First-Order Logic (FOL), which allows us to harness the power of existing SMT solvers. We provide rules to automatically construct the FOL encoding from programs written in SQL (allowing loops and conditionals) and express consistency specifications as FOL formula. In addition to detecting bounded serializability violations, we also provide two orthogonal schemes to reason about unbounded executions by providing sufficient conditions (again, in the form of FOL formulae) whose satisfiability implies the absence of anomalies in any arbitrary execution. We have applied the proposed technique on TPC-C, a real-world database program with complex application logic, and were able to discover anomalies under Parallel Snapshot Isolation (PSI), and verify serializability for unbounded executions under Snapshot Isolation (SI), two consistency mechanisms substantially weaker than serializability.
Cite as

Kartik Nagar and Suresh Jagannathan. Automated Detection of Serializability Violations Under Weak Consistency. In 29th International Conference on Concurrency Theory (CONCUR 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 118, pp. 41:1-41:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

Copy BibTex To Clipboard

@InProceedings{nagar_et_al:LIPIcs.CONCUR.2018.41,
  author =	{Nagar, Kartik and Jagannathan, Suresh},
  title =	{{Automated Detection of Serializability Violations Under Weak Consistency}},
  booktitle =	{29th International Conference on Concurrency Theory (CONCUR 2018)},
  pages =	{41:1--41:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-087-3},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{118},
  editor =	{Schewe, Sven and Zhang, Lijun},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2018.41},
  URN =		{urn:nbn:de:0030-drops-95799},
  doi =		{10.4230/LIPIcs.CONCUR.2018.41},
  annote =	{Keywords: Weak Consistency, Serializability, Database Applications}
}
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