linux-kernel - Re: [PATCH 1/1] Char: tty_io, fix closecount counting

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Message-ID: <48413B6E.3050202@gmail.com>
Date:	Sat, 31 May 2008 13:50:06 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	linux-kernel@...r.kernel.org, Paul Fulghum <paulkf@...rogate.com>
Subject: Re: [PATCH 1/1] Char: tty_io, fix closecount counting

Jiri Slaby napsal(a):
> This is probably a fix for an issue first reported in 2.6.18.1:
> http://lkml.org/lkml/2006/10/20/301
> and
> http://marc.info/?l=linux-mips&m=118797256328587

Alan, I know, you already stated some time ago, that you don't have a clue 
what could have caused this. Haven't you found anything since that time as I 
think the hangup path is the only possible cause of this problem?

I've found an other one from 2.6.17-rc4:
http://readlist.com/lists/vger.kernel.org/linux-kernel/44/220050.html
and from 2.6.22+suse_stuff:
http://lists.opensuse.org/opensuse-bugs/2008-04/msg05628.html

It is ever vcs1, which is /dev/console and it is the only treated separately 
(otherwise I think we would have more (and distinct) reports like this). 
When the console is HUPped? And what should happen with openers? The 
2.6.22+suse happened when sulogin /dev/console was invoked. Any ideas how to 
track this down?

> --- a/drivers/char/tty_io.c
> +++ b/drivers/char/tty_io.c
> @@ -1434,9 +1434,9 @@ static void do_tty_hangup(struct work_struct *work)
>  	list_for_each_entry(filp, &tty->tty_files, f_u.fu_list) {
>  		if (filp->f_op->write == redirected_tty_write)
>  			cons_filp = filp;
> +		closecount++;
>  		if (filp->f_op->write != tty_write)
>  			continue;
> -		closecount++;
>  		tty_fasync(-1, filp, 0);	/* can't block */
>  		filp->f_op = &hung_up_tty_fops;
>  	}
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