> Date: Mon, 15 Nov 2004 04:46:38 -0800
> From: bugme-daemon@xxxxxxxx
> To: bugme-new@xxxxxxxxxxxxxx
> 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
> 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
> 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
> machine, ctrl-alt-del or sysrq doesn't work). Problem was on kernels from
> 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
> 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.?