https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211689

--- Comment #11 from Alan Somers <asom...@freebsd.org> ---
Created attachment 179015
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179015&action=edit
Remove the sc_lladdr_task taskqueue

Please try the attached patch.  It removes the sc_lladdr_task taskqueue, and
simply removes the link local addresses inline with lagg_port_destroy.

The lp->detaching check in lagg_port_lladdr is there to avoid a recursive lock
acquisition panic that happens when sending the gratuitous ARP caused by
removing the link-local address.  It's ok to skip sending the gratuitous ARP
because we're about to destroy the lagg port, anyway.

The change to in6.c is more complicated, and I need to check with some IPv6
experts to be sure that it's valid.  But without that change, I find that a
lagg port can end up with a link-local address even though ND6_IFF_IFDISABLED
is set.

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