In master TSAN: https://248712-65214191-gh.circle-artifacts.com/0/failed-testlogs/test/extensions/filters/http/dynamic_forward_proxy/proxy_filter_integration_test/test.log In LLVM coverage it hangs: https://circleci.com/gh/envoyproxy/envoy/248719
