Threading causes timer IRQ to fail

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What steps will reproduce the problem?
1. Create a thread
2. Run it
3. Let it finish

What is the expected output? What do you see instead?
I expected the timer IRQ, to keep fireing, but instead, it just stops.

Please take a look in the code to see if you can help me

```

Original issue reported on code.google.com by `mine...@gmail.com` on 12 Mar 2011 at 6:02
