Steve Stagg <stest...@gmail.com> added the comment:

It's possible that RPi.GPIO (or another C extension) is mis-managing reference 
counts, resulting in it freeing or trying to free an object at the wrong time.  

If that object is a common value, or the branch that causes the refcount issue 
is uncommon, it may take many millions of cycles for the problem to occur.

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nosy: +stestagg

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<https://bugs.python.org/issue41335>
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