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Date:      Thu, 14 Feb 2002 07:31:11 -0600
From:      Maxime Henrion <mux@sneakerz.org>
To:        freebsd-security@freebsd.org
Cc:        kurnik@kurnik.pl
Subject:   Re: FreeBSD 4.5 syncache problem
Message-ID:  <20020214073111.C26590@sneakerz.org>
In-Reply-To: <Pine.LNX.4.21.0202141402280.20567-100000@polchat.pl>; from kurnik@kurnik.pl on Thu, Feb 14, 2002 at 02:12:47PM %2B0100
References:  <Pine.LNX.4.21.0202141402280.20567-100000@polchat.pl>

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kurnik@kurnik.pl (kurnik@kurnik.pl) wrote:
> Hi!
> 
> I'd like to migrate my Linux powered server to FreeBSD 4.5 but there's
> a critical syncache related bug that makes it easy to remotely cause
> kernel panic on any server running FreeBSD 4.5. 
> (more on this bug at www.freebsd.org/cgi/query-pr.cgi?pr=kern/34658)

Could you probide a way to reliable reproduce it ?  I'm sure this would
help a lot getting this bug fixed, since it's not mentioned in the PR.

> My questions:
> 
> 1. Is there a simple way to fix this problem? (e.g. disabling syncache,
> whatever)

Look at the various sysctls in net.inet.tcp, there's probably one to this
purpose.

> 2. Is it a good idea to run FreeBSD 4.5 on a server or should I consider
> some older releases like 4.4 or 4.0?

I'd say disable syncache if possible and run 4.5.

Maxime Henrion

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