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Reasoning about threads communicating via locks. (English) Zbl 1081.68623
Etessami, Kousha (ed.) et al., Computer aided verification. 17th international conference, CAV 2005, Edinburgh, Scotland, UK, July 6–10, 2005. Proceedings. Berlin: Springer (ISBN 3-540-27231-3/pbk). Lecture Notes in Computer Science 3576, 505-518 (2005).
Summary: We propose a new technique for the static analysis of concurrent programs comprised of multiple threads. In general, the problem is known to be undecidable even for programs with only two threads but where the threads communicate using CCS-style pairwise rendezvous. However, in practice, a large fraction of concurrent programs can either be directly modeled as threads communicating solely using locks or can be reduced to such systems either by applying standard abstract interpretation techniques or by exploiting separation of control from data. For such a framework, we show that for the commonly occurring case of threads with nested access to locks, the problem is efficiently decidable. Our technique involves reducing the analysis of a concurrent program with multiple threads to individually analyzing augmented versions of the given threads. This not only yields decidability but also avoids construction of the state space of the concurrent program at hand and thus bypasses the state explosion problem making our technique scalable. We go on to show that for programs with threads that have non-nested access to locks, the static analysis problem for programs with even two threads becomes undecidable even for reachability, thus sharpening the result of G. Ramalingam [ACM Trans. Program. Lang. Syst. 22, 416–430 (2000)]. As a case study, we consider the Daisy file system which is a benchmark for analyzing the efficacy of different methodologies for debugging concurrent programs and provide results for the detection of several bugs.
For the entire collection see [Zbl 1078.68004].

MSC:
68Q60 Specification and verification (program logics, model checking, etc.)
68N99 Theory of software
Software:
veriSoft
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