Seen on PR #15839 https://source.cloud.google.com/results/invocations/97023f40-71d8-4d2c-8eac-ae75b512780d/targets/github%2Fgrpc%2Fc_macos_dbg_native/tests <img width="1152" alt="screen shot 2018-06-25 at 9 57 40 am" src="https://user-images.githubusercontent.com/8952658/41864279-3e1e9d0e-785e-11e8-80f8-d1a9de2a15ce.png">
