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I've been using Chrome's Timeline view to attempt to track down some memory leaks in my page. I've found one particular memory leak that results from instantiating web workers that I can't seem to figure out how to get rid of.
I've stripped down the page to just load the web worker and do nothing else. Every time I refresh the page, the Document Count on Chrome's timeline view permanently increases by 1. If I comment out the call to the Worker constructor, and begin refreshing the page, the document count increases and then decreases, effectively staying the same. Manually terminating/closing the worker does not resolve the issue (although I can see the worker disappear when I look at the Sources tab of the developer tools).
Here is my trimmed down .htm file. I am able to reproduce the issue with just this short chunk of html/javascript:
<html>
<script type="text/javascript">
var worker_blob = new Blob(["var test = 1;"]);
var worker_url = window.URL.createObjectURL(worker_blob);
// Comment out the line below and the memory leak goes away
var worker = new Worker(worker_url);
window.URL.revokeObjectURL(worker_url);
</script>
</html>
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This is a memory leak in Chrome v25. It appears to be fixed in Chrome v26, as the issue can no longer be reproduced.
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