[Webkit-unassigned] [Bug 24806] New: addEventListener to node with closure+circular ref leaks DOM nodes

Wed Mar 25 10:37:44 PDT 2009

https://bugs.webkit.org/show_bug.cgi?id=24806

           Summary: addEventListener to node with closure+circular ref leaks
                    DOM nodes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: 280lifestyle at gmail.com

The following JS leaks DOM nodes until the document is thrown away. Safari 4,
also tested with Chrome 1.x/v8 which shows the same behavior.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
  <title>listTest</title>

  <script type="text/javascript" charset="utf-8">

                makeClosure= function(object) {
                  return function() {
                    return object;
                  }
                };

                gIntervalCount = 0;

                myLeakyFunc = function() {              
                        var i, widget;

                        console.log("myLeakyFunc: "+gIntervalCount++);

                        for(i=0; i<1000; i++) {

                                // The leak seems to be caused by an event
listener on a node, 
                                // where the listener's closure has a circular
reference to the node.
                                widget = document.createElement('div');
                                widget.addEventListener('whatever',
makeClosure(widget), false);

                                // Adding some extra chold nodes to the leaked
div makes the memory leak more apparent, but is not necessary.
                                widget.innerHTML =
'<div></div><div></div><div></div><div></div><div></div><div></div><div></div><div></div>'; 
                        }
                }

                window.setInterval(myLeakyFunc, 500);

  </script>
</head>

<body>
</body>
</html>

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