linux-kernel - Re: [Bug 10741] bug in `tty: BKL pushdown'?

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Message-ID: <20080616124602.54910afd@lxorguk.ukuu.org.uk>
Date:	Mon, 16 Jun 2008 12:46:02 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Johannes Weiner <hannes@...urebad.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Bug 10741] bug in `tty: BKL pushdown'?

On Mon, 16 Jun 2008 11:33:13 +0100
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > The bug still exists, however, a bisect on another machine with the same
> > userland leads to different commit
> > (47f86834bbd4193139d61d659bebf9ab9d691e37 "redo locking of tty->pgrp"),
> > so it is not all that clear and stable.
> 
> Now that would actually make a lot more sense as a root cause.

Experiment time. In _proc_set_tty() in tty_io.c move the

	tty->session = get_pid(task_session(tsk));

back inside the lock just before

	tty->pgrp = get_pid(task_pgrp(tsk));

Alan
--
  "Standards committees don't like hashing.  It looks complicated and
    insufficiently deterministic on an overhead projector."
					- Vern Schryver
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