[Bug 233995] Inconsistent arp handling in multiple fibs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233995

            Bug ID: 233995
           Summary: Inconsistent arp handling in multiple fibs
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: patrik at hildingsson.se

uname -a; FreeBSD lrrr.guld.sen 12.0-RELEASE FreeBSD 12.0-RELEASE r341666
GENERIC  amd64
uname -U; 1200086
uname -K; 1200086

lagg0;
        laggproto lacp lagghash l2,l3,l4
        laggport: em0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
        laggport: igb0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
        groups: lagg



fib0 contains
Internet:
Destination        Gateway            Flags     Netif Expire
default            192.168.23.1       UGS       lagg0
192.168.23.0/24    link#4             U         lagg0
192.168.23.124     link#4             UHS         lo0

fib1 contains
Internet:
Destination        Gateway            Flags     Netif Expire
default            192.168.22.1       UGS    lagg0.200
192.168.22.0/24    link#17            U      lagg0.200
192.168.22.13      tt:uu:vv:xx:yy:zz  UHS    lagg0.200

When attempting communication in fib 1 with remote hosts within the same
routing domain , i.e. 192.168.22.1 it fails and the following logentry is
written:
Dec 13 21:00:03 lrrr kernel: arpresolve: can't allocate llinfo for 192.168.22.1
on lagg0.200

When adding the following entry in fib0 the communication works.
setfib 0 route add -net 192.168.22.0/24 -iface lagg0.200

In addition, when adding a static ARP entry the communication works.
setfib 1 arp -s 192.168.22.1 ss:uu:vv:xx:yy:zz

It seems to me that ARP should work in either fib regardless of fib0 having the
network in question. This issue seems to have existed before according to
https://lists.freebsd.org/pipermail/freebsd-net/2012-May/032340.html

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