摘要:
A system and method for verifying a composition of interacting services in a distributed system includes generating a concurrent process graph (CPG) for processes in a system and symbolically encoding the CPG of each process to perform a reachability analysis. Symbolic summaries are generated for concurrently running processes based on the reachability analysis. Modular verification is conducted by utilizing the symbolic summaries of the processes to verify a system of interrelated processes.
摘要:
A system and method for analyzing concurrent programs that guarantees optimality in the number of thread inter-leavings to be explored. Optimality is ensured by globally constraining the inter-leavings of the local operations of its threads so that only quasi-monotonic sequences of threads operations are explored. For efficiency, a SAT/SMT solver is used to explore the quasi-monotonic computations of the given concurrent program. Constraints are added dynamically during exploration of the concurrent program via a SAT/SMT solver to ensure quasi-montonicity for model checking.
摘要:
A system and method for conducting symbolic partial order reduction for concurrent systems includes determining a guarded independence relation which includes transitions from different threads that are independent for a set of states, when a condition or predicate holds. Partial order reduction is performed using the guarded independence relation to permit automatic pruning of redundant thread interleavings when the guarded independence condition holds.
摘要:
Systems and method provide a coverage-guided systematic testing framework by dynamically learning HaPSet ordering constraints over shared object accesses; and applying the learned HaPSet ordering constraints to select high-risk interleavings for future test execution.
摘要:
A symbolic predictive analysis method for finding assertion violations and atomicity violations in concurrent programs is shown that derives a concurrent trace program (CTP) for a program under a given test. A logic formula is then generated based on a concurrent static single assignment (CSSA) representation of the CTP, including at least one assertion property or atomicity violation. The satisfiability of the formula is then determined, such that the outcome of the determination indicates an assertion/atomicity violation.
摘要:
A symbolic disjunctive image computation method for software models which exploits a number of characteristics unique to software models. More particularly, and according to our inventive method, the entire software model is decomposed into a disjunctive set of submodules and a separate set of transition relations are constructed. An image/reachability analysis is performed wherein an original image computation is divided into a set of image computation steps that may be performed on individual submodules, independently from any others. Advantageously, our inventive method exploits variable locality during the decomposition of the original model into the submodules. By formulating this decomposition as a multi-way hypergraph partition problem, we advantageously produce a small set of submodules while simultaneously minimizing the number of live variable in each individual submodule. Our inventive method produces a set of disjunctive transition relations directly from the software model, without producing a conjunctive transition relation—as is necessary in the prior art. In addition, our inventive method exploits the exclusive use of live variables in addition to novel search strategies which provide still further benefit to our method.
摘要:
A system and method for dynamic data race detection for concurrent systems includes computing lockset information using a processor for different components of a concurrent system. A controlled execution of the system is performed where the controlled execution explores different interleavings of the concurrent components. The lockset information is used during the controlled execution to check whether a search subspace associated with a state in the execution is free of data races. A race-free search subspace is dynamically pruned to reduce resource usage.
摘要:
A system and method for analyzing concurrent programs that guarantees optimality in the number of thread inter-leavings to be explored. Optimality is ensured by globally constraining the inter-leavings of the local operations of its threads so that only quasi-monotonic sequences of threads operations are explored. For efficiency, a SAT/SMT solver is used to explore the quasi-monotonic computations of the given concurrent program. Constraints are added dynamically during exploration of the concurrent program via a SAT/SMT solver to ensure quasi-montonicity for model checking.
摘要:
Systems and methods are disclosed for performing counterexample guided abstraction refinement by transforming a design into a functionally equivalent Control and Data Flow Graph (CDFG); performing a hybrid abstraction of the design; generating a hybrid abstract model; and checking the hybrid abstract model.
摘要:
A computer implemented method for the verification of concurrent software programs wherein the concurrent software program is partitioned into subsets named concurrent trace programs (CTPs) and each of the CTPs is evaluated using a satisfiability-based (SAT) symbolic analysis. By applying the SAT analysis to individual CTPs in isolation the symbolic analysis is advantageously more scalable and efficient.