/go/src/github.com/cockroachdb/cockroach/vendor/google.golang.org/grpc/clientconn.go:366 +0x17c
  google.golang.org/grpc.(*ClientConn).Invoke()
      /go/src/github.com/cockroachdb/cockroach/vendor/google.golang.org/grpc/call.go:35 +0x1a6
  github.com/cockroachdb/cockroach/pkg/rpc.(*heartbeatClient).Ping()
      /go/src/github.com/cockroachdb/cockroach/pkg/rpc/heartbeat.pb.go:246 +0x10a
  github.com/cockroachdb/cockroach/pkg/rpc.(*Context).runHeartbeat.func3.2()
      /go/src/github.com/cockroachdb/cockroach/pkg/rpc/context.go:1169 +0xef
  github.com/cockroachdb/cockroach/pkg/rpc.(*Context).runHeartbeat.func3()
      /go/src/github.com/cockroachdb/cockroach/pkg/rpc/context.go:1176 +0x1024
  github.com/cockroachdb/cockroach/pkg/util/stop.(*Stopper).RunTaskWithErr()
      /go/src/github.com/cockroachdb/cockroach/pkg/util/stop/stopper.go:326 +0x129
  github.com/cockroachdb/cockroach/pkg/rpc.(*Context).runHeartbeat()
      /go/src/github.com/cockroachdb/cockroach/pkg/rpc/context.go:1142 +0x62c
  github.com/cockroachdb/cockroach/pkg/rpc.(*Context).grpcDialNodeInternal.func1.1()
      /go/src/github.com/cockroachdb/cockroach/pkg/rpc/context.go:1061 +0x94
  github.com/cockroachdb/cockroach/pkg/util/stop.(*Stopper).RunAsyncTask.func1()
      /go/src/github.com/cockroachdb/cockroach/pkg/util/stop/stopper.go:347 +0x149

Goroutine 146 (running) created at:
  google.golang.org/grpc/internal/transport.newHTTP2Client()
      /go/src/github.com/cockroachdb/cockroach/vendor/google.golang.org/grpc/internal/transport/http2_client.go:346 +0x1488
  google.golang.org/grpc/internal/transport.NewClientTransport()
      /go/src/github.com/cockroachdb/cockroach/vendor/google.golang.org/grpc/internal/transport/transport.go:580 +0x6c7
  google.golang.org/grpc.(*addrConn).createTransport()
      /go/src/github.com/cockroachdb/cockroach/vendor/google.golang.org/grpc/clientconn.go:1323 +0x4f7
  google.golang.org/grpc.(*addrConn).tryAllAddrs()
      /go/src/github.com/cockroachdb/cockroach/vendor/google.golang.org/grpc/clientconn.go:1253 +0x507
  google.golang.org/grpc.(*addrConn).resetTransport()
      /go/src/github.com/cockroachdb/cockroach/vendor/google.golang.org/grpc/clientconn.go:1168 +0x33b

Goroutine 62 (running) created at:
  github.com/cockroachdb/cockroach/pkg/util/stop.(*Stopper).RunAsyncTask()
      /go/src/github.com/cockroachdb/cockroach/pkg/util/stop/stopper.go:342 +0x107
  github.com/cockroachdb/cockroach/pkg/rpc.(*Context).grpcDialNodeInternal.func1()
      /go/src/github.com/cockroachdb/cockroach/pkg/rpc/context.go:1059 +0x411
  sync.(*Once).doSlow()
      /usr/local/go/src/sync/once.go:68 +0x109
  sync.(*Once).Do()
      /usr/local/go/src/sync/once.go:59 +0x68
  github.com/cockroachdb/cockroach/pkg/rpc.(*Context).grpcDialNodeInternal()
      /go/src/github.com/cockroachdb/cockroach/pkg/rpc/context.go:1053 +0x25c
  github.com/cockroachdb/cockroach/pkg/rpc.(*Context).GRPCDialNode()
      /go/src/github.com/cockroachdb/cockroach/pkg/rpc/context.go:1018 +0x88
  github.com/cockroachdb/cockroach/pkg/rpc.TestTestingKnobs()
      /go/src/github.com/cockroachdb/cockroach/pkg/rpc/context_test.go:1694 +0xa2c
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1193 +0x202
==================
    testing.go:1092: race detected during execution of test
--- FAIL: TestTestingKnobs (0.11s)