From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Graf Subject: Re: Fw: [Bugme-new] [Bug 3747] New: HTB causes machine lockups Date: Tue, 16 Nov 2004 00:38:06 +0100 Message-ID: <20041115233806.GC31969@postel.suug.ch> References: <20041115122059.4cfcd213.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@oss.sgi.com, Andrew Morton Return-path: To: alchemyx@uznam.net.pl Content-Disposition: inline In-Reply-To: <20041115122059.4cfcd213.akpm@osdl.org> Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org > Date: Mon, 15 Nov 2004 04:46:38 -0800 > From: bugme-daemon@osdl.org > To: bugme-new@lists.osdl.org > Subject: [Bugme-new] [Bug 3747] New: HTB causes machine lockups > > I have some network traffic shaping rules used on a Linux box. For example I > have hundreds of them on eth1. I am using HTB in all cases (sometimes attaching > SFQ to HTB rules). Everything works fine, until I issue: > > tc qdisc del dev eth1 root > > Which causes a machine lockup. Sometimes it happens day after day, but sometimes > once a month. There are no traces in logs, no oopses, and so on. Machine just > freezes (you see login on your screen, but can't type anything, can't ping that > machine, ctrl-alt-del or sysrq doesn't work). Problem was on kernels from 2.4.21 > up to 2.4.26. Haven't tried 2.4.27 and 2.6.x on that box yet. > > Steps to reproduce: > Hard to tell really. You need to set up a script creating hunderds of HTB rules > and regenerating them every (let say) 15 minutes, issuing 'tc qdisc del dev > ethX' everytime. Did you ever experience the same problems with other classful qdiscs such as CBQ? Would it be possible for you to run a similar CBQ setup on a dummy device and see if it happens as well? Is anything going on at the time of the deadlocks like an interface going down etc.?