> Those daemons started very early are special, they don't start working
> until the interface is configured to use them. I'm not sure it's an
> appropriate place to run dhcpcd (and hacking /etc/rc to do it is
> definitely less than ideal).

Of course I wish I didn't have to hack rc(8); but until dhcp6leased(8)
integrates IA_NA, I'm stuck with non-base daemons. Admittedly, dhcpcd is
pretty high quality with good privsep; so it's not a big deal to me. Also
even if dhcp6leased(8) added IA_NA, I'd still have to hack rc(8) to move
where it is started since it's started too late for my use case. Also one
benefit of using one daemon for both DHCPv6 and DHCP is easily ensuring the
same DUID is used which is both recommended by RFC-I-forget and required
by certain ISPs.

> Is it any better if you do e.g.
>
> <whatever other setup>
> up
> !rcctl start dhcpcd
>
> in the relevant hostname.if file?

Ah, haven't tried that. Maybe I'll change my setup to that instead.

> Sounds like 10.0.10 in 7.6 release was no better for you either then and
> updating it to 10.1.0 helped Courtney.

Not only was it not any better, it was worse due to the PD-renwal bug.

> Happy to backport if there's an upstream commit re this. But I'd rather
> not do that until then.

I agree you should wait until a commit fixes the problem. I will report
back when that happens.