[Bug 233683] IPv6 ND neighbor solicitation messages fail to arrive

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233683

--- Comment #13 from Kristof Provost <kp@freebsd.org> ---
Re-assigning an IPv6 address that’s already there seems to trigger this.

I’m still investigating, but I believe the problem is that ifconfig deletes the
IP address before setting it again. The delete ends up calling in6_purgeaddr(),
which marks the relevant multicast groups as no longer needed, but leaves their
actual removal to mld_fasttimo() (i.e. asynchronously).
The IP address gets added again, and either the groups don’t get re-added or
they don’t get marked as needed. This bit I’m still unclear on, but as I said:
I’m still digging.

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