[issue21435] Segfault with cyclic reference and asyncio.Future

[Antoine Pitrou]

Antoine Pitrou added the comment:

> The new info:  its (the list object's) gc_refs also changed from
> GC_TENTATIVELY_UNREACHABLE to GC_UNTRACKED,  That the object became
> untracked is wholly consistent with that its gc_next became NULL but
> not its gc_prev.

Could that be the trashcan mecanism?

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<http://bugs.python.org/issue21435>
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