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When reaching the end of a script, there is no garbage collection done if another thread is running.
If you have cyclic references between objects that would be elligible for collection under one of which a __del__ would terminate that thread, execution will hang at the end of the "main thread".
We ended up in this situation; adding "gc.collect" at the end of our script solves the problem, but this is a library and it is not reasonnable to assume all our clients will properly ensure every execution path properly forces a garbage collection.
Suggestion: at the end of a thread, or at least main thread, force a collection.