Rémi Lapeyre <remi.lape...@henki.fr> added the comment:

Hi, I think this is indeed a bug, `copy()` is expected to succeed. I was able 
to reproduce the issue in an interpreter but did not succeed to write a test 
case that triggers the race-condition.

I think the fix you suggested is the right solution.

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nosy: +remi.lapeyre

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35615>
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