OSX Linger failure

linger_test.go

package linger_test

import (
	"fmt"
	"io"
	"math/rand"
	"net"
	"testing"
	"time"

	"github.com/stretchr/testify/require"
)

func TestLinger(t *testing.T) {
	ln, err := net.ListenTCP("tcp4", nil)
	require.NoError(t, err)
	defer ln.Close()

	done := make(chan struct{})
	accepted := make(chan struct{})
	go func() {
		defer close(done)
		conn, err := ln.Accept()
		require.NoError(t, err)
		close(accepted)
		io.ReadAll(conn)
	}()

	conn, err := net.DialTCP("tcp4", nil, ln.Addr().(*net.TCPAddr))
	require.NoError(t, err)
	require.NoError(t, conn.SetLinger(0))
	fmt.Printf("%s <-> %s\n", conn.LocalAddr(), conn.RemoteAddr())
	go func() {
		for {
			b := make([]byte, 1+rand.Intn(1000))
			_, err := conn.Write(b)
			if err != nil {
				return
			}
			time.Sleep(time.Duration(rand.Intn(1000)) * time.Microsecond)
		}
	}()

	<-accepted
	time.Sleep(time.Duration(rand.Intn(30)) * time.Millisecond)
	require.NoError(t, conn.Close())

	select {
	case <-done:
	case <-time.After(10 * time.Second):
		t.Fatal("remote conn didn't close")
	}
}