STINNER Victor added the comment:

queue_bug.py: script to reproduce the bug.

I confirm that Queue.get() sometimes looses items when it is cancelled. The 
waiter contains the result, but the waiter is lost when get() is cancelled.

Queue.get() waiter got a result, but Queue.get() wakeup is only *scheduled* 
yet. It may even be executed in the same iteration, or maybe in the next loop 
iteration.

I didn't review patches yet.

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Added file: http://bugs.python.org/file38820/queue_bug.py

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