From owner-freebsd-emulation@FreeBSD.ORG  Mon May  7 14:13:52 2007
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Date: Mon, 7 May 2007 08:13:34 -0600
From: John E Hein <jhein@timing.com>
To: "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au>
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Cc: emulation@freebsd.org
Subject: Re: sec:uRe: sec:uRe: sec:uRe: [net/citrix_ica/]
 /usr/local/bin/wfcmgr ...  hangs upon exec().
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Wilkinson, Alex wrote at 16:03 +0800 on May  7, 2007:
 >     0n Mon, May 07, 2007 at 09:59:59AM +0200, Alexander Leidinger wrote: 
 > 
 >     >Quoting "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au> (from  
 >     >Mon, 7 May 2007 15:30:10 +0800):
 >     >
 >     >>  #sysctl compat.linux.debug
 >     >>  sysctl: unknown oid 'compat.linux.debug'
 >     >
 >     >sysctl -a | grep linux | grep debug
 > 
 > nada:
 > 
 > #sysctl -a | grep linux | grep debug
 > #

Then somehow you didn't build or install or kldload it properly.

If you have DEBUG defined when you build linux.ko, then kldload _that_
linux.ko, you should immediately be able to see compat.linux.debug in
the output of sysctl -a.

How about this:

strings linux.ko | grep Linux.debugging.control

(make sure this is the linux.ko that you think you are kldload'ing)