Node cluster is gone crazy!

client.js

var net = require("net");

var target = 10;
var created = 0;

function createConnection() {
  if (created === target) {
    return;
  }
  var id = created++;

  var conn = net.createConnection({port: 3000})
  conn.write("01234567890");
  conn.setEncoding("utf8");
  var data = "";
  conn.on("data", function(chunk) {
    data += chunk;
  });
  conn.on("error", function(err) {
    console.log("ERROR :(", err);
  });
  conn.on("end", function() {
    console.log(id + ": " + data);
  })
  setImmediate(createConnection);
}

createConnection();

server.js

var cluster = require("cluster");

if (cluster.isMaster) {
  cluster.fork().process.on("message", function(msg, connection) {
    connection.once("readable", function() {
      var data = connection.read();
      connection.write("I read: " + data);
      connection.end();
    });
  });
}
else
{
  var server = require("net").createServer();
  server.on("connection", function(c) {
    process.send("conn", c);
  });
  server.listen(3000);
}