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From: Robert Watson <rwatson@FreeBSD.org>
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To: ALeine <aleine@austrosearch.net>
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cc: drice@globat.com
cc: freebsd-hackers@freebsd.org
Subject: Re: Fatal trap 12: page fault while in kernel mode - HELP! 
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On Tue, 8 Feb 2005, ALeine wrote:

> drice@globat.com wrote: 
> 
> > We have two NFS file servers running FreeBSD 5.2.1-RELEASE-p9 on
> > Dell Poweredge 1750's that crash randomly. They each have about 1.3TB
> > of disk. They are used to server email and web content to several
> > WEB/EMAIL servers. Followin is the console log messages and the kernel boot
> > messages. Any ideas as to what the problem may be?
> 
> Try turning TCP SACK off by putting net.inet.tcp.sack.enable=0 in
> sysctl.conf. 

TCP SACK first shipped in 5.3...

Robert N M Watson