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Date: Tue, 04 Aug 2009 10:21:16 -0700
From: Julian Elischer <julian@elischer.org>
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To: Maslan <maslanbsd@gmail.com>
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Cc: Ed Schouten <ed@80386.nl>, FreeBSD Hackers <freebsd-hackers@freebsd.org>
Subject: Re: sosend() and mbuf
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Maslan wrote:
> Guys,
> 
> Here is the code, just scroll down and change kthread_create2() to
> kthread_create() and it will crash
> 
> NOTE: i'm still working on the socket part, u can commend it.
> 
> Something wrong with proc0, and I can't figure it out
> 
> 
> ------------------------------------------------------------------------
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The problem is that you are NOT on proc0
You have created your own kernel process and is DOES NOT have
a file descriptor table.

in 8.x this is all changed.

using kthread_create2 creates a kernel thread attached to YOUR USER 
PROCESS. and YOU DO have a file descriptor table, as does proc0
as a special case of kernel process.