mem leak ? with setTimeout

README.md

I am actually playing on the branch https://github.com/joyent/node/tree/http-memleak

Without setTimeout it works like a charm,

node --expose-gc gistfile1.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: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
90MB used
Done: 18/18, not yet GC: 0
all requests done, memory should be collected by now ?
3MB used
Done: 18/18, not yet GC: 0
all requests done, memory should be collected by now ?

But with a setTimeout, ...

node --expose-gc gistfile1.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: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
Got error: socket hang up
90MB used
Done: 18/18, not yet GC: 3
all requests done, memory should be collected by now ?
15MB used
Done: 18/18, not yet GC: 3
all requests done, memory should be collected by now ?
15MB used
Done: 18/18, not yet GC: 3
all requests done, memory should be collected by now ?
15MB used
Done: 18/18, not yet GC: 3
all requests done, memory should be collected by now ?
15MB used
Done: 18/18, not yet GC: 3
all requests done, memory should be collected by now ?
15MB used
Done: 18/18, not yet GC: 3
all requests done, memory should be collected by now ?
15MB used
Done: 18/18, not yet GC: 3
all requests done, memory should be collected by now ?
15MB used
Done: 18/18, not yet GC: 3
all requests done, memory should be collected by now ?

gistfile1.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.connection.destroy();
  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,
        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);