[Bug 296591] Bridge(4) flaps when the first vmnet(4) interface is added

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296591

            Bug ID: 296591
           Summary: Bridge(4) flaps when the first vmnet(4) interface is
                    added
           Product: Base System
           Version: 15.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: [email protected]
          Reporter: [email protected]

I have a bridge(4) here with some epair(4)s and an ix(4) (Intel X520).

When I add or remove the first vmnet(4) member the bridge flaps.

I can see no reason why it should do that.

Once the bridge already has a vmnet member, I can add and delete
as many vmnet interfaces as I want, without it flapping.

My workaround is to add a dummy unused, vmnet999 to the bridge
in /etc/rc.conf to get the flapping over with.

But surely that cannot be right ?

I noticed that vmnet(4) is the only interface with IFCAP_LINKSTATE,
and that bridge_linkcheck() is interested in that bit, but I would
pressume that the other interfaces being LINK_STATE_UP will keep
the bridge up in the hasls==0 case.

I'm not going to be very popular if I muck too much about with this
machine particular, so sticking prinf's in there is not at present
an option for me.

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