Unix TcpListener bug

UnixTcpListenerBug.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;
using System.Threading;

namespace TcpListenerTest
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var sync = new AutoResetEvent(false);
            RunServer(sync);
            sync.WaitOne();
            HitServer(sync);
            sync.WaitOne();
            Console.WriteLine("Hit a key to close and reopen...");
            Console.ReadLine();

            // On second run (Unix only) TcpListener.Start throws:
            // Unhandled Exception: System.Net.Sockets.SocketException: Address already in use
            //    at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
            //    at System.Net.Sockets.Socket.Bind(EndPoint localEP)
            //    at System.Net.Sockets.TcpListener.Start(Int32 backlog)
            //    at System.Net.Sockets.TcpListener.Start()
            //    at TcpListenerTest.Program.<RunServer> d__1.MoveNext()
            RunServer(sync); 
            sync.WaitOne();
            HitServer(sync);
            sync.WaitOne();
            // We get here under Windows just fine
            Console.WriteLine("OK, that worked fine."); 
            Console.ReadLine();
        }

        async static void RunServer(AutoResetEvent sync) {

            var listener1 = new TcpListener(IPAddress.Any, 7000);
            Console.WriteLine("Server starting");
            listener1.Start();

            sync.Set();

            var client = await listener1.AcceptTcpClientAsync();
            Console.WriteLine("Server got connection");
            client.Dispose();
            listener1.Stop();
            Console.WriteLine("Server stopped");
        }

        async static void HitServer(AutoResetEvent sync) {
            using (var client = new TcpClient()) {
                Console.WriteLine("Client connecting");
                await client.ConnectAsync(IPAddress.Parse("127.0.0.1"), 7000);
            }
            Console.WriteLine("Client disconnected");

            sync.Set();
        }
    }
}