Re: ipv6 panic in 6.0 ([kris@FreeBSD.org: kern/85780: 'panic:bogus refcnt 0' in routing/ipv6])

From: Andre Oppermann (andre_at_freebsd.org)
Date: 09/28/05

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    Date: Wed, 28 Sep 2005 17:51:46 +0200
To: Kris Kennaway <kris@obsecurity.org>

    Kris Kennaway wrote:
    >
    > On Wed, Sep 28, 2005 at 12:06:18PM +0900, SUZUKI Shinsuke wrote:
    > > Hello kris,
    > >
    > > >>>>> On Tue, 27 Sep 2005 18:26:34 -0400
    > > >>>>> kris@obsecurity.org(Kris Kennaway) said:
    > >
    > > > Can someone please look into this ipv6 panic? It is now my #1 panic
    > > > on 6.0 (every few days, and I hardly make any use of ipv6 except for
    > > > light nfs and tcp traffic), so it would be good to get it fixed before
    > > > the release.
    > >
    > > Let me confirm one thing.
    > > Did you also see a message "panic: bogus refcnt 0", in your panic?
    >
    > Yes, that's the panic string.
    >
    > > As far as I investigated, only IF_CLONE_REMREF_LOCKED() can display
    > > this message. But it's called only in
    > > if_clone_create/detach/destory(), and none of them seems to be called
    > > according to the description in the PR. (rtexpunge() in route.c also
    > > has this message, but it is commented out by "if 0", so it is not the
    > > cause of this message)
    >
    > I have a number of (sparc64) cores for this panic if you'd like to see
    > them.

    This particular panic string is used by RT_REMREF() via RTFREE_LOCKED()
    too. It could be triggered anywhere in the routing/network code. 

    -- 
Andre
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  • Next message: Chris Howells: "Re: em(4) receive part wedging randomly at moderate load"