We present KReach, a tool for deciding reachability in general Petri nets. The tool is a full implementation of Kosaraju’s original 1982 decision procedure for reachability in VASS. We believe this to be the first implementation of its kind. We include a comprehensive suite of libraries for development with Vector Addition Systems (with States) in the Haskell programming language. KReach serves as a practical tool, and acts as an effective teaching aid for the theory behind the algorithm. Preliminary  tests  suggest  that  there  are  some  classes  of  Petri  nets  for which we can quickly show unreachability. In particular, using KReach for  coverability  problems,  by  reduction  to  reachability,  is  competitive even against state-of-the-art coverability checkers.

KReach: A Tool for Reachability in Petri Nets

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