GenMC: A model checker for weak memory models Summary GenMC is an open-source state-of-the-art model checker for verifying concurrent C/C++ programs under the RC11, IMM, and LKMM memory models. GenMC is based on a stateless model checking algorithm that is parametric in the choice of memory model. Subject to a few basic conditions about the memory model, our algorithm is sound, complete and optimal, in that it explores each consistent execution of the program according to the model exactly once...