Re: 2.6.25.3: su gets stuck for root

[Alan Cox]

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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