Date: Wed, 4 Jun 2008 11:16:49 -0400
From: Alan Cox <alan@redhat.com>
To: Joe Peterson <joe@skyrush.com>
Cc: Alan Cox <alan@redhat.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       David Newall <davidn@davidnewall.com>, Willy Tarreau <w@1wt.eu>,
       Harald Dunkel <harald.dunkel@t-online.de>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.25.3: su gets stuck for root
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On Wed, Jun 04, 2008 at 08:43:00AM -0600, Joe Peterson wrote:
> 
> So the error that gets returned to set_termios() is -512.
> 
> Also, the various checks before this point (of course) did not pass
> (current->signal->tty != tty, !tty->pgrp, task_pgrp(current) ==
> tty->pgrp, is_ignored(SIGTTOU), is_current_pgrp_orphaned()).  I have not
> printed out the various values from these - let me know if this would be
> helpful.  I wanted to pass this info along now in case it is of help.

See what tty->pgrp is at that point when it hangs and that might identify
who is owning the tty and tty setup
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