Problems with first device on bridge

[Sean C. Farley]

On a 7-STABLE (built August 7th), I have noticed messages appearing in
/var/log/messages:
Aug  7 15:07:17 thor kernel: rtfree: 0xc7143a2c has 2 refs
Aug  7 15:07:19 thor last message repeated 2 times
Aug  7 15:09:28 thor last message repeated 3 times
Aug  7 15:11:54 thor last message repeated 9 times

This happens if I set up a bridge to have em0 and tap0 such as from:
ifconfig bridge0 create
ifconfig bridge0 addm em0
ifconfig bridge0 addm tap0

When I start QEMU on tap0, I would immediately lose IPv6 on em0 and
eventually IPv4 would go away.  I would get a lot more of messages about
rtfree with QEMU started.

>From experimentation (and some luck), I found that if I reversed the
devices on a newly created bridge then the rtfree messages would go
away, but I would have problems with tap0.  The workaround:  create two
tap devices tap0 and tap1 and add to bridge0 in the order of tap1, tap0
and em0.

On another system, I noticed that a bridge between real NIC's (em1 and
sk0) also reports an rtfree message during boot.  Any ideas?

Sean
-- 
scf at FreeBSD.org