Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

> But this makes it not leak again, so now we know it's the traceback:

The traceback is a very heavy gc object because it contains the frames, and in 
the locals of the frame is the traceback itself via the exception. This is a 
well known heavy cycle, but the gc should take care of it if the cycle becomes 
isolated

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44895>
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