multiple ports are listened to when starting the debug agent

[myron369]

When starting the debug agent, multiple ports from 6060 to 6100 are being listened to. Is the intention here to avoid a single port being occupied? If so, it seems that the behavior should be modified so that once a successful ListenAndServe (encountering a free port) occurs, the process should stop occupying additional ports.I can help fix it (if it is indeed a bug).

        // cmd/main.go
	if !c.Bool("no-agent") {
		go debugAgentOnce.Do(func() {
			for port := 6060; port < 6100; port++ {
				debugAgent = fmt.Sprintf("127.0.0.1:%d", port)
				logger.Debugf("Debug agent listening on %s", debugAgent)
				_ = http.ListenAndServe(debugAgent, nil)
			}
		})
	}

[jiefenghuang]

ListenAndServe will block and loop to handle HTTP requests without occupying other ports. When the process exits, it will terminate along with it.