Try lots of runs under chaos mode: http://robert.ocallahan.org/2016/02/introducing-rr-chaos-mode.html http://robert.ocallahan.org/2016/02/introducing-rr-chaos-m

Try lots of runs under chaos mode: http://robert.ocallahan.org/2016/02/introducing-rr-chaos-mode.html http://robert.ocallahan.org/2016/02/introducing-rr-chaos-mod... If you figure out the cause of a bug that rr chaos mode was not able to reproduce, please file an rr issue and explain the situation. We've generally been able to improve chaos mode to find hitherto non-reproducible bugs.