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Date:      Sat, 22 Oct 2005 08:45:35 -0400
From:      Mike Tancsa <mike@sentex.net>
To:        Stefan Ehmann <shoesoft@gmx.net>, Kris Kennaway <kris@obsecurity.org>
Cc:        current@freebsd.org
Subject:   Re: PREEMPTION still unusable with 6.0-RC1
Message-ID:  <6.2.3.4.0.20051022084314.045a23c8@64.7.153.2>
In-Reply-To: <1129977974.987.19.camel@taxman.pepperland>
References:  <1129879049.771.6.camel@localhost> <20051021072448.GA15130@xor.obsecurity.org> <1129977974.987.19.camel@taxman.pepperland>

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At 06:46 AM 22/10/2005, Stefan Ehmann wrote:

>Anyway, I might have found the LOR that causes the problem [1]. show
>allocks output can be seen in [2]
>
>It's similar to http://sources.zabbadoz.net/freebsd/lor/016.html (as it
>also happens in check_uidgid(). There's a nice explaination by rwatson
>in the linked thread.

There is another LOR in ip_divert at the same line

http://sources.zabbadoz.net/freebsd/lor/163.html

it is also easy to reproduce and leads to deadlock.  I had to move to 
pf to work around it.


         ---Mike 




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