[issue45020] Freeze all modules imported during startup.

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

could changes related to this be the cause of https://bugs.python.org/issue45506 ?

out of tree builds in main usually cannot pass key tests today.  they often hang or blow up with strange exceptions.

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nosy: +gregory.p.smith

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45020>
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