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

From: Kris Kennaway (kris_at_obsecurity.org)
Date: 09/04/05

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To: glebius@FreeBSD.org, mlaier@FreeBSD.org, net@FreeBSD.org

    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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