https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292634

            Bug ID: 292634
           Summary: ifconfig doesn't display bridge members when a span
                    interface is added
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: [email protected]
          Reporter: [email protected]

It's just a display issue, normal and span members work as intended.

To reproduce the problem (on 15.0-RELEASE):

# ifconfig bridge0 create
# ifconfig tap0 create
# ifconfig tap1 create
# ifconfig bridge0 addm tap0
# ifconfig bridge0
bridge0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=10<VLAN_HWTAGGING>
        ether 58:9c:fc:10:ab:d7
        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 0 ifcost 0 port 0
        bridge flags=0<>
        member: tap0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                port 4 priority 128 path cost 2000000 vlan protocol 802.1q
        groups: bridge
        nd6 options=9<PERFORMNUD,IFDISABLED>
# ifconfig bridge0 span tap1
# ifconfig bridge0
bridge0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=10<VLAN_HWTAGGING>
        ether 58:9c:fc:10:ab:d7
        groups: bridge
#

----------------------------------------
For reference, on 14.3-RELEASE, we get:

# ifconfig bridge0 create
# ifconfig tap0 create
# ifconfig tap1 create
# ifconfig bridge0 addm tap0
# ifconfig bridge0 span tap1
# ifconfig bridge0
bridge0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=0
        ether 58:9c:fc:10:b3:24
        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 0 ifcost 0 port 0
        member: tap0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                ifmaxaddr 0 port 4 priority 128 path cost 2000000
        member: tap1 flags=8<SPAN>
                ifmaxaddr 0 port 5 priority 128 path cost 2000000
        groups: bridge
        nd6 options=9<PERFORMNUD,IFDISABLED>
#

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