Inada Naoki <songofaca...@gmail.com> added the comment:

> In my implementation, there is guards that do early return in those cases and 
> there are tests that check that indeed we don't crash of that happens when 
> calling the exposed functions

The guard doesn't help much. _PyObject_GC_UNTRACK() is called from many object 
tp_dealloc().
After user call `gc.untrack(obj)`, when the obj is deallocated, assertion error 
happens.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42039>
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