From owner-freebsd-stable  Wed Aug 29 11: 2:14 2001
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Date: Wed, 29 Aug 2001 13:56:35 -0400
To: Yar Tikhiy <yar@FreeBSD.ORG>
From: Mike Tancsa <mike@sentex.net>
Subject: Re: kernel panic when bringing up a VLAN interface (netgraph?)
Cc: Archie Cobbs <archie@dellroad.org>, stable@FreeBSD.ORG
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Hi,
         Peter Blok on freebsd-net ran into the same problem and has some 
insight as well. The thread is "Runt frames = broken VLAN ? "

http://docs.freebsd.org/cgi/getmsg.cgi?fetch=155593+0+current/freebsd-net

         ---Mike

At 09:49 PM 8/29/01 +0400, Yar Tikhiy wrote:
>Hi,
>
>I was able to reproduce the panic and get a core file.
>However, gdb output looks rather strange to me:
>
>(kgdb) where
>#5  0xc020951f in trap (frame={tf_fs = 16, tf_es = 125960208, tf_ds =
>[...]
>#6  0xc01973e4 in ng_ether_output (ifp=0xc026d2e0, mp=0xc8735d34)
>     at ../../netgraph/ng_ether.c:274
>[...]
>
>(kgdb) up 6
>#6  0xc01973e4 in ng_ether_output (ifp=0xc026d2e0, mp=0xc8735d34)
>     at ../../netgraph/ng_ether.c:274
>274             const node_p node = IFP2NG(ifp);
>
>(kgdb) p ifp
>$1 = (struct ifnet *) 0x0
>(kgdb) p mp
>$2 = (struct mbuf **) 0x6718ba
>
>Why does gdb report the values of "ifp" and "mp" inconsistently?
>The kernel crashed at the first line of ng_ether_output(), so
>the arguments couldn't be modified... I'm confused.
>
>--
>Yar


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