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Date: Sun, 6 May 2007 09:22:35 -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 21:26 +0800 on May  6, 2007:
 >     0n Fri, May 04, 2007 at 11:55:09AM +0800, Wilkinson, Alex wrote: 
 > 
 >     >wfcmgr is now hanging again. I have added debugging to the linux module.
 >     >
 >     >   #wfcmgr
 >     >   load: 0.01  cmd: wfcmgr 19922 [ptsopn] 0.17u 0.03s 0% 6568k
 >     >   load: 0.01  cmd: wfcmgr 19922 [ptsopn] 0.17u 0.03s 0% 6568k
 >     >   load: 0.01  cmd: wfcmgr 19922 [ptsopn] 0.17u 0.03s 0% 6568k
 >     >   load: 0.01  cmd: wfcmgr 19922 [ptsopn] 0.17u 0.03s 0% 6568k
 >     >
 >     >dmesg(1) outputs nothing.
 >     >Can someone tell me where the debugging info is meant to output ?
 > 
 > Anyone ?

Yes, you should see output in dmesg (and /var/log/messages if
syslog.conf is in the default configuration).

But you have to also turn on some debug via sysctl...
sysctl compat.linux.debug=all.1

all.0 to turn it off, or something other than all to control debug
output for a particular call... see sys/compat/linux/linux_mib.c
and sys/<arch>/linux/linux.h