Failure log: http://gohan2.ysv.freebsd.org/data/head-amd64-default-baseline/p446433_s321376/logs/errors/grpc-1.4.2.log Possible fix (untested): https://github.com/google/benchmark/commit/8ae6448cc7ec6353e3491a2a15f972f9735f124b
I have upgraded to grpc-1.4.3 and new benchmark revision, and it seems fine to me.