Ned Deily <n...@python.org> added the comment:

FWIW, I see similar behavior on a 2017 MBP running with 10.15.6 or 11.0 (Big 
Sur) beta 4. That's ... odd that there is a non-unique MAC address. (Not 
surprisingly, there is no such problem on an iMac that doesn't have the 
touchbar subsystem.) That particular interface doesn't show up in the 
user-visible Network panel of System Preferences so it can't even be easily 
reordered there.  I suppose there is a good reason why it appears at the top of 
the interface list but, yes, we don't want to be using a non-unique MAC address 
to generate UUIDs. The question then is: is there any way for the uuid module 
to recognize and ignore such interfaces other than by the hardcoded MAC address?

----------
stage:  -> needs patch
title: uuid.uuid1() on macOS doesn't generate unique IDs -> uuid.uuid1() on 
certain Macs does not generate unique IDs
versions: +Python 3.10, Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41552>
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