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> I have a memory leak problem: some userdata objects are never GC'd, and I
> really fail to find where it's referenced. Is there a well-known recipe to
> help tracking down such leaks, if I know which userdata I'm chasing?

Last year Alexandra posted a tool that may help you; have a look at

and related thread.

> Alternatively, is there some well-known trap that tends to make userdata
> more persistent than expected?

Not that I am aware...

-- Roberto