'panic: bogus refcnt 0' from routing/ipv6 code.

[Kris Kennaway]

I got this on a quad sparc64 machine running 7.0 from a few days ago.
Both IPv4 and IPv6 are in use on the machine.

I will leave it in DDB for now in case you want something from it, but
I should be able to obtain a core.

Kris

panic: bogus refcnt 0
cpuid = 0
KDB: enter: panic
[thread pid 15 tid 100003 ]
Stopped at      kdb_enter+0x3c: ta              %xcc, 1
db> wh
Tracing pid 15 tid 100003 td 0xfffff8001fb75680
panic() at panic+0x164
rtfree() at rtfree+0x7c
nd6_na_output() at nd6_na_output+0x4d0
nd6_ns_input() at nd6_ns_input+0x704
icmp6_input() at icmp6_input+0xc38
ip6_input() at ip6_input+0xf5c
netisr_processqueue() at netisr_processqueue+0x7c
swi_net() at swi_net+0xdc
ithread_loop() at ithread_loop+0x18c
fork_exit() at fork_exit+0x94
fork_trampoline() at fork_trampoline+0x8
db>
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