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From: John Baldwin <jhb@freebsd.org>
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 glebius@freebsd.org
Date: Mon, 27 Aug 2012 10:28:59 -0400
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	(bigwig.baldwin.cx); Mon, 27 Aug 2012 14:40:33 -0400 (EDT)
Cc: freebsd-gnats-submit@freebsd.org, Ivan Goryushkin <animage.nvkz@gmail.com>
Subject: Re: amd64/171108: Kernel panic
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On Monday, August 27, 2012 12:12:37 am Ivan Goryushkin wrote:
> #3  0xffffffff80936e76 in dblfault_handler (frame=Variable "frame" is not 
available.
> )
>     at /usr/src/sys/amd64/amd64/trap.c:852
> #4  0xffffffff8091eefd in Xdblfault ()
>     at /usr/src/sys/amd64/amd64/exception.S:284
> #5  0xffffffff8073b772 in ipfw_chk (args=0xffffff8231ee1190)
>     at /usr/src/sys/netinet/ipfw/ip_fw2.c:1168
> #6  0xffffffff8074161a in ipfw_check_hook (arg=Variable "arg" is not 
available.
> )
>     at /usr/src/sys/netinet/ipfw/ip_fw_pfil.c:137
> #7  0xffffffff806ca55c in pfil_run_hooks (ph=Variable "ph" is not available.
> ) at /usr/src/sys/net/pfil.c:82
> #8  0xffffffff8074a34a in ip_output (m=0xffffff019e941b00, opt=Variable 
"opt" is not available.
> )
>     at /usr/src/sys/netinet/ip_output.c:511
> #9  0xffffffff807b8236 in tcp_output (tp=0xffffff02199b8760)
>     at /usr/src/sys/netinet/tcp_output.c:1230
> #10 0xffffffff807bbc7f in tcp_mtudisc (inp=0xffffff0219a89bd0, 
errno=Variable "errno" is not available.
> )
>     at tcp_offload.h:282
> #11 0xffffffff807b912c in tcp_output (tp=0xffffff02199b8760)
>     at /usr/src/sys/netinet/tcp_output.c:1291
> #12 0xffffffff807bbc7f in tcp_mtudisc (inp=0xffffff0219a89bd0, 
errno=Variable "errno" is not available.

This looks to have been fixed in HEAD a few weeks ago:

http://svnweb.freebsd.org/base?view=revision&revision=238516

Gleb, were you planning on MFC'ing this to 8 or 9?

-- 
John Baldwin