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

You mean because we need to modify _gc_prev and they may be in an inconsistent 
state? I may be missing something, but the only tricky moment is if someone 
calls this from a finalizer and in that case we have already constructed the 
reachable and unreachable sets. Or are you referring to other possible crashes?

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<https://bugs.python.org/issue42039>
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