Abstract
Temporal hyperproperties are system properties that relate multiple execution traces. In finite-state systems, temporal hyperproperties are supported by model-checking algorithms, and tools for general temporal logics like HyperLTL exist. In infinite-state systems, the analysis of temporal hyperproperties has, so far, been limited to k-safety properties, i.e., properties that stipulate the absence of a bad interaction between any k traces. In this paper, we present an automated method for the verification of ∀k∃l -safety properties in infinite-state systems. A ∀k∃l -safety property stipulates that for any k traces, there exist l traces such that the resulting k + l traces do not interact badly. This combination of universal and existential quantification captures many properties beyond k-safety, including hyperliveness properties such as generalized non-interference or program refinement. Our verification method is based on a strategy-based instantiation of existential trace quantification combined with a program reduction, both in the context of a fixed predicate abstraction.