Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Operations with the linked list are atomic (guarded with the GIL), while 
operations with the cache dict are not. That is why links are removed first 
from the linked list and added back in case of error.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35780>
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