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1.16 isn't a supported version.

As far as we're aware, Serve does return on a closed listener:

package main

import (
	"log"
	"net"
	"net/http"
	"time"
)

func main() {
	lis, err := net.Listen("tcp", ":0")
	if err != nil {
		log.Fatalln(err)
	}
	svr := &http.Server{}
	errc := make(chan error)
	go func() {
		errc <- svr.Serve(lis)
	}()
	time.Sleep(time.Second)
	log.Println("close lis", lis.Close())
	log.Println("serve err", <-errc)
}

results in:

2024/06/25 16:20:15 close lis <nil>
2024/06/25 16:20:15 serve err accept tcp [::]:44157: use of closed network connection

1.16 isn't a supported version.

As far as we're aware, Serve does return on a closed listener:

package main

import (
	"log"
	"net"
	"net/http"
	"time"
)

func main() {
	lis, err := net.Listen("tcp", ":0")
	if err != nil {
		log.Fatalln(err)
	}
	svr := &http.Server{}
	errc := make(chan error)
	go func() {
		errc <- svr.Serve(lis)
	}()
	time.Sleep(time.Second)
	log.Println("close lis", lis.Close())
	log.Println("serve err", <-errc)
}

results in:

2024/06/25 16:20:15 close lis <nil>
2024/06/25 16:20:15 serve err accept tcp [::]:44157: use of closed network connection

Yes, mostly the 1.16 behaves the same, the server will close after the listener was closed, but sometimes it won't. I can't reproduce it but it keeps happening.

@seankhliao I know 1.16 is old, but does this issue remind you of any related issues?

There are a bunch of possibly-related issued in the comment by gabyhelp above.