>> I agree here; but note that we surely also have a lot of code that
>> breaks or at least gives similar error messages if we disable IPv4.
> The bug is simply that our libc resolver code returns addresses for
> families that the kernel does not support.  It should check and
> remove them upfront.

I'd disagree, actually.  Not all uses of the resolver are to try to
initiate communication with, and *definitely* not all uses of the
resolver are to try to initiate communication with from the current
host more-or-less immediately after the query.  (Most, perhaps.
Definitely not all.)

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