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From: Robert Watson <rwatson@FreeBSD.org>
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To: Jung-uk Kim <jkim@FreeBSD.org>
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Cc: Alexey Dokuchaev <danfe@nsu.ru>, freebsd-current@FreeBSD.org
Subject: Re: Kernel panic with if_sf.ko
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On Wed, 1 Jul 2009, Jung-uk Kim wrote:

> On Wednesday 01 July 2009 12:21 pm, Alexey Dokuchaev wrote:
>
>> I've started to observe the following rather annoying panic if I boot with 
>> if_sf loaded (via loader.conf) and having sf0 configured via DHCP on recent 
>> -CURRENT.  If I comment out driver from loader.conf and load it manually 
>> (via kldload(8)) after system boots, it loads and gets configured just 
>> fine.
>>
>> Any clues here?  Attached is relevant dmesg + DDB trace (debug kernel with 
>> WITNESS).  I'm happy to provide any additional information (that is, 
>> ps/show uma/malloc, whatever).
>
> Last time I checked, bpf(4) with MAC caused a similar problem when it is 
> destroying bpf descriptor label.  GENERIC includes MAC by default now.  If 
> you don't need MAC, try removing "options MAC" from your kernel 
> configuration.

I was not aware of this problem -- could you provide some more details?  Any 
panic caused by having MAC in the kernel is a bug...

Robert N M Watson
Computer Laboratory
University of Cambridge