Date: Wed, 29 Aug 2001 21:49:11 +0400 From: Yar Tikhiy <yar@FreeBSD.ORG> To: Mike Tancsa <mike@sentex.net> Cc: Archie Cobbs <archie@dellroad.org>, stable@FreeBSD.ORG Subject: Re: kernel panic when bringing up a VLAN interface (netgraph?) Message-ID: <20010829214910.A204@comp.chem.msu.su> In-Reply-To: <5.1.0.14.0.20010828000259.024e98e8@192.168.0.12>; from mike@sentex.net on Tue, Aug 28, 2001 at 12:07:20AM -0400 References: <5.1.0.14.0.20010827183043.042e6198@192.168.0.12> <200108280337.f7S3bhD33238@arch20m.dellroad.org> <5.1.0.14.0.20010828000259.024e98e8@192.168.0.12>
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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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