From owner-freebsd-current@FreeBSD.ORG  Sun Feb  8 21:56:04 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id E23CC16A4CE
	for <freebsd-current@freebsd.org>;
	Sun,  8 Feb 2004 21:56:04 -0800 (PST)
Received: from smtp01.syd.iprimus.net.au (smtp01.syd.iprimus.net.au
	[210.50.30.52])	by mx1.FreeBSD.org (Postfix) with ESMTP id B2FB143D1D
	for <freebsd-current@freebsd.org>;
	Sun,  8 Feb 2004 21:56:04 -0800 (PST)
	(envelope-from tim@robbins.dropbear.id.au)
Received: from robbins.dropbear.id.au (210.50.216.114) by
	smtp01.syd.iprimus.net.au (7.0.024)
	id 400C4DF400808B02; Mon, 9 Feb 2004 16:57:17 +1100
Received: by robbins.dropbear.id.au (Postfix, from userid 1000)
	id C81A041AE; Mon,  9 Feb 2004 16:55:18 +1100 (EST)
Date: Mon, 9 Feb 2004 16:55:18 +1100
From: Tim Robbins <tjr@freebsd.org>
To: Matthias Andree <ma@dt.e-technik.uni-dortmund.de>
Message-ID: <20040209055518.GA64068@cat.robbins.dropbear.id.au>
References: <m34qu1vt4b.fsf@merlin.emma.line.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <m34qu1vt4b.fsf@merlin.emma.line.org>
User-Agent: Mutt/1.4.1i
cc: freebsd-current@freebsd.org
Subject: Re: how to confuse truss: truss -f fsck -p /
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 09 Feb 2004 05:56:05 -0000

On Mon, Feb 09, 2004 at 04:17:40AM +0100, Matthias Andree wrote:

> After typing "truss -f fsck -p /", I see nothing. I press ^Z
> and type kill -9 % (killing truss).
> 
> I now have these fine processes hanging dead in memory, they are immune
> to kill -9 and don't respond to kill -CONT either, ps axl:
> 
>   UID   PID  PPID CPU PRI NI   VSZ  RSS MWCHAN STAT  TT       TIME COMMAND
>     0 56974     1   0   8  0  1256  744 ppwait D     p1    0:00.00 fsck -p /
>     0 56975 56974   0   8  0  1256  744 stopev DV    p1    0:00.00 fsck -p /
> 
> Is this how things are supposed to be, even though killing a tracer is
> way stupid? I think it's not nice to have unkillable processes.

procfs is disabled by default for a reason :-)

> Is there a way to get rid of these without reboot?

Try procctl(8).


Tim