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Date: Sun, 10 Jun 2012 23:17:50 +0700
From: Eugene Grosbein <egrosbein@rdtc.ru>
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To: Sami Halabi <sodynet1@gmail.com>
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Cc: freebsd-stable@freebsd.org
Subject: Re: su problem
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10.06.2012 01:45, Sami Halabi пишет:
> Hi,
> 
> %sysctl kern.console
> kern.console: ttyv0,dcons,/dcons,ttyv0,uart,ucom,
> 
> %tail /var/log/messages
> Jun  7 19:54:35 vps16 kernel: Trying to mount root from ufs:/dev/da0s1a
> Jun  7 19:54:36 vps16 kernel: bge0: link state changed to UP
> Jun  7 20:18:04 vps16 kernel: ugen0.2: <vendor 0x09da> at usbus0
> Jun  7 20:18:04 vps16 kernel: ukbd0: <vendor 0x09da USB Keyboard, class
> 0/0, rev 1.10/2.50, addr 2> on usbus0
> Jun  7 20:18:04 vps16 kernel: kbd2 at ukbd0
> Jun  7 20:18:05 vps16 kernel: uhid0: <vendor 0x09da USB Keyboard, class
> 0/0, rev 1.10/2.50, addr 2> on usbus0
> Jun  7 20:19:37 vps16 login: ROOT LOGIN (root) ON ttyv1
> Jun  7 20:21:19 vps16 kernel: ugen0.2: <vendor 0x09da> at usbus0
> (disconnected)
> Jun  7 20:21:19 vps16 kernel: ukbd0: at uhub0, port 1, addr 2 (disconnected)
> Jun  7 20:21:19 vps16 kernel: uhid0: at uhub0, port 1, addr 2 (disconnected)
> %
> 
> the system was loaded with keyboard and disconnected later if i understand
> the logs...
> 
> New ideas are appreciated, and thanks in advance,
> Sami

I still believe your problem concerns serial console:
su writes to it, indirectly - it notes root login through syslogd
that writes the message to /dev/console and locks in your case, locking su.

Eugene Grosbein