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We present a new technique called Monotonic Partial Order Reduction (MPOR) that effectively combines dynamic partial order reduction with symbolic state space exploration for model checking concurrent software. Our technique hinges on a new characterization of partial orders defined by computations of a concurrent program in terms of quasi-monotonic(More)
A large number of industrial concurrent programs are being designed based on a model which combines threads with event-based communication. These programs consist of several threads which perform computation by dispatching tasks to other threads via <i>asynchronous function calls</i>. These asynchronous function calls are implemented using function objects,(More)
Triggering errors in concurrent programs is a notoriously difficult task. A key reason for this is the behavioral complexity resulting from the large number of interleavings of operations of different threads. Efficient static techniques , therefore, play a critical role in restricting the set of interleavings that need be explored in greater depth. The(More)
The problem of Pairwise CFL-reachability is to decide whether two given program locations in different threads are simultaneously reachable in the presence of recursion in threads and scheduling constraints imposed by synchronization primitives. Pairwise CFL-reachability is the core problem underlying concurrent program analysis especially dataflow(More)
We propose a static analysis framework for concurrent programs based on reduction of thread interleavings using sound invariants on the top of partial order techniques. Starting from a product graph that represents transactions, we iteratively refine the graph to remove statically unreachable nodes in the product graph using the results of these analyses.(More)
We propose new, tractably (in some cases provably) efficient algo-rithmic methods for exact (sound and complete) parameterized reasoning about cache coherence protocols. For reasoning about general snoopy cache protocols, we introduce the guarded broadcast protocols model and show how an abstract history graph construction can be used to reason about safety(More)
We present new techniques for fast, accurate and scalable static data race detection in concurrent programs. Focusing our analysis on Linux device drivers allowed us to identify the unique challenges posed by debugging large-scale real-life code and also pinpointed drawbacks in existing race warning generation methods. This motivated the development of new(More)
We propose a framework for improving both the scalability as well as the accuracy of pointer alias analysis, irrespective of its flow or context-sensitivities, by leveraging a three-pronged strategy that effectively combines <i>divide and conquer, parallelization and function summarization</i>. A key step in our approach is to first identify small subsets(More)