Date: Mon, 1 Mar 2004 14:09:45 -0500 (EST)
From: "Richard B. Johnson" <root@chaos.analogic.com>
Reply-To: root@chaos.analogic.com
To: Nuno Monteiro <nuno@itsari.org>
cc: Linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: something funny about tty's on 2.6.4-rc1-mm1
In-Reply-To: <20040301184512.GA21285@hobbes.itsari.int>
Message-ID: <Pine.LNX.4.53.0403011402100.10151@chaos>
References: <20040301184512.GA21285@hobbes.itsari.int>
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
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On Mon, 1 Mar 2004, Nuno Monteiro wrote:

>
> Hi all,
>
> I just took 2.6.4-rc1-mm1 for a spin, and there's definitely something
> funny about tty's. I left the computer unattended and had visitors over,
> among them small children who, apparently, decided I needed 350 aterm's
> open ;-). So, after they left I issued a 'killall -9 aterm' and fired up
> a new one, and here's something definitely interesting:
>
> nuno@hobbes:~$ w
>  18:33:56 up  4:08, 157 users,  load average: 0.03, 0.89, 1.51
> USER     TTY        LOGIN@   IDLE   JCPU   PCPU WHAT
> nuno     :0        14:26   ?xdm?   3:55   0.95s gnome-session
> nuno     pts/358   18:30    0.00s  0.10s  0.00s w
>

But `w` just reads /var/run/utmp to see who's logged on. It reads
/proc for info. If you just killed all the tasks as you state,
(with KILL instead of TERM) utmp probably doesn't have logout
entries. This seems like a `w` problem, not a kernel problem.

The pts ttys will get recycled just like pids. There is no
error here either.

>
> I know for a fact that I don't have 157 logged in users (well, there's
> only 45 processes running right now), and shouldn't pts' be recycled, and
> a lower number be assigned? The last kernel I ran was 2.6.3, and none of
> this happened.
>
> My config is:
>
> CONFIG_UNIX98_PTYS=y
> CONFIG_LEGACY_PTYS=y
> CONFIG_LEGACY_PTY_COUNT=512
>
> and this is a plain jane static /dev -- not devfs nor udev. Despite the
> supposedly 157 users logged in, /dev/pts only contains '358', which is
> the one allocated to this instance of aterm right now.
>
> nuno@hobbes:~$ ls -l /dev/pts
> total 0
> crw--w----    1 nuno     users    136, 102 Mar  1 18:41 358
>
> In the mean time I'll fall back to 2.6.3.
>
>
> Regards,
>
>
> 		Nuno
>
> -
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>

Cheers,
Dick Johnson
Penguin : Linux version 2.4.24 on an i686 machine (797.90 BogoMips).
            Note 96.31% of all statistics are fiction.


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