mem leak ? timeout and onError with a working HTTP Server

gistfile1.txt

node --expose-gc leak.js
webkit-devtools-agent started on 0.0.0.0:1337
We should do 18 requests
3MB used
Done: 0/18, not yet GC: 0
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
Got error: undefined
96MB used
Done: 18/18, not yet GC: 18
all requests done, memory should be collected by now ?
96MB used
Done: 18/18, not yet GC: 18
all requests done, memory should be collected by now ?

leak.js

    var http = require('http'),
      weak = require('weak'),
      done = 0, count = 0, countGC = 0, todo = 18;
    var agent = require('webkit-devtools-agent');

    console.log('We should do '+ todo +' requests');

    // show memused and progress while running
    setInterval(status, 5000);status();

    var http = require('http');
    http.createServer(function (req, res) {
      res.writeHead(200, {'Content-Type': 'text/plain'});
      res.end('Hello World\n');
    }).listen(3000, '127.0.0.1', getall);


    function getall() {
      for(var i = 0; i < todo; i++) {
        (function(){
          // creates a big buffer
          var megabig = new Big();
          weak(megabig, afterGC);

          // this should not trigger a memory leak but it does when using http.get
          function cb(e) {
            if(e) console.log("Got error: " + e.message);
            done+=1;
            return megabig;
          }

          // using setTimeout instead of http.get shows no mem leak
          // setTimeout(cb, 10);

          http.get({
            hostname: 'localhost',
            pathname: '/index.html?' + Math.random(),
            port: 3000,
            //agent: false,
            protocol: 'http:'
          }, cb).on('error', function(e) {
            cb(e);
          }).setTimeout(10, function(){
            console.log('nothing here')
          })
        })()
      }
    }

    function Big() {
      count ++;
      this.yo = (new Buffer(1 * 1024 * 1024 * 3)).toString();
    }

    function afterGC(){
      countGC ++
    }

    function status() {
      gc()
      console.log((process.memoryUsage().heapUsed/1024/1024).toFixed() + 'MB used');
      console.log('Done: '+ done +'/'+ todo + ', not yet GC: ' + (count - countGC));
      if (done === todo) {
        console.log('all requests done, memory should be collected by now ?')
      }
    }

    setTimeout(function(){}, 1000000000);