Hello,

I have created a sample code that reporduces the problem. 

Code - https://gist.github.com/3595299

Please download it and run it. If you run it without any modification, you 
should see the problems. Currently loop is iterating till 1000 and it is 
failing for me. In my friend's computer it was working fine for 1000 
iterations. He modified it to a larger value to get the failure. So you 
might need to change that number to get a failure. 

Here is what the code does.

* Calls "process" function 1000 times from JS.
* "process" function UnWraps the class instance from V8 and assign that to 
the workerdata instance. 
* Call uv_queue_work.
* Worker thread will read a handle from the queue after acquiring a mutex. 
This handle will be removed from the queue. 
* After doing the work, handle will be returned back to the queue. This 
will also happen after acquiring a mutex. 

I got double free errors and segfault. But this is random and sometimes the 
whole thing just works. In the "test.js", I have commented out calls to 
"sleep". Uncommenting this seems to fix the issue. 

I am wondering why this happens. Any help would be great. 

I am using Node v0.8.8 on Arch Linux.

Thanks
Navaneeth

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