[Bug 191889] New: ipv6_activate_all_interfaces="NO" not working as expected for lagg interfaces and laggports

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191889

            Bug ID: 191889
           Summary: ipv6_activate_all_interfaces="NO" not working as
                    expected for lagg interfaces and laggports
           Product: Base System
           Version: 10.0-STABLE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: conf
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: clint at clintarmstrong.net

I have 2 nics on my system, em0 and em1. They are configured as laggports on
lagg0. lagg0 is a member of bridge0 which is where I'd like to configure the
host IP address. I would like only bridge0 to get a link local address. I have
a third physical interface, re0 that I'm not using at all. I have no
configuration for re0 in my rc.conf, it works as expected.

Steps to reproduce:

# rc.conf
ipv6_activate_all_interfaces="NO"
cloned_interfaces="lagg0 bridge0"
ifconfig_em0="up"
ifconfig_em1="up"
ifconfig_lagg0="up laggport em0 laggport em1 laggproto roundrobin"
ifconfig_bridge0="up addm lagg0 addm tap0 192.168.10.10/24"
ifconfig_bridge0_ipv6="inet6 auto_linklocal accept_rtadv"

Expected result:

em0, em1 and lagg0 should have no IPV4 or IPV6 addresses. bridge0 should have a
link local address.

Actual result: All interfaces get link local addresses.

# ifconfig
re0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=8209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,LINKSTATE>
        ether 50:e5:49:WW:WW:WW
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
       
options=4019b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
        ether 00:15:17:XX:XX:XX
        inet6 fe80::215:17ff:feXX:XXXX%em0 prefixlen 64 scopeid 0x2
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
em1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
       
options=4019b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
        ether 00:15:17:0b:13:86
        inet6 fe80::215:17ff:feXX:XXXY%em1 prefixlen 64 scopeid 0x3
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
lagg0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
       
options=4019b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
        ether 00:15:17:XX:XX:XX
        inet6 fe80::52e5:49ff:feYY:YYYY%lagg0 prefixlen 64 scopeid 0x5
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect
        status: active
        laggproto roundrobin lagghash l2,l3,l4
        laggport: em1 flags=4<ACTIVE>
        laggport: em0 flags=4<ACTIVE>
bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 02:34:2f:ZZ:ZZ:ZZ
        inet 192.168.10.10 netmask 0xffffff00 broadcast 192.168.10.255
        inet6 fe80::34:2fff:feZZ:ZZZZ%bridge0 prefixlen 64 scopeid 0x6
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
        id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
        root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
        member: lagg0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 5 priority 128 path cost 55

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