net: DNS broken on darwin without cgo (1.13 regression) #31705
Description
I was testing some new code for the Go build system and found that a simple TCP dial doesn't work on Mac anymore, at least when the binary is cross-compiled.
Code is just:
var coordDialer = &net.Dialer{
Timeout: 10 * time.Second,
KeepAlive: 15 * time.Second,
}
// dialCoordinatorTCP returns a TCP connection to the coordinator, making
// a CONNECT request to a proxy as a fallback.
func dialCoordinatorTCP(ctx context.Context, addr string) (net.Conn, error) {
tcpConn, err := coordDialer.DialContext(ctx, "tcp", addr)... with a context.Background() for ctx.
It always times out after 10 seconds.
But if I redeploy the same code but built with Go 1.12.x, it works fine.