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Date: Tue, 11 Mar 2003 10:44:20 +0100
From: bert hubert <ahu@ds9a.nl>
To: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>, Martin Devera <devik@cdi.cz>,
       Linux Kernel Mailinlist <linux-kernel@vger.kernel.org>,
       David Jarvis <david@uninetwork.co.za>, netdev@oss.sgi.com
Subject: Re: kernel panic: bug in sch_sfq.c
Message-ID: <20030311094420.GB19658@outpost.ds9a.nl>
Mail-Followup-To: bert hubert <ahu@ds9a.nl>,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	Martin Devera <devik@cdi.cz>,
	Linux Kernel Mailinlist <linux-kernel@vger.kernel.org>,
	David Jarvis <david@uninetwork.co.za>, netdev@oss.sgi.com
References: <20030311091409.GA4491@oasis.frogfoot.net>
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On Tue, Mar 11, 2003 at 11:14:09AM +0200, Abraham van der Merwe wrote:
> Hi!
> 
> I have a box that crashed today. Below is the decoded kernel panic. If you
> track down the bug PLEASE send me a patch.

Weird, Alexeys code is normally very very solid. Perhaps HTB is also
involved. Devik?

> 
> ------------< snip <------< snip <------< snip <------------
> ksymoops 2.4.8 on i686 2.4.20-rc1.  Options used
>      -v vmlinux-2.4.21-pre5 (specified)
>      -K (specified)
>      -L (specified)
>      -O (specified)
>      -m System.map-2.4.21-pre5 (specified)
> 
> Unable to handle kernel NULL pointer dereference at virtual address 00000004
> *pde = 00000000
> Oops: 0002
> CPU:    0
> EIP:    0010:[<c01a5399>]    Not tainted
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010202
> eax: 00000000   ebx: c7b9a9e8   ecx: 0000007f   edx: c7a8eef8
> esi: c7b9ab08   edi: 000007f0   ebp: c7a8e060   esp: c021deb8
> ds: 0018   es: 0018   ss: 0018
> Process swapper (pid: 0, stackpage=c021d000)
> Stack: c7b9a9e8 c7b9ab08 c7f7ee00 c7b9a860 c7b893c0 c7f7ee00 c7b9a860 00000000
>        c01a3507 c7b5c680 7fb9a9f0 c01a339e c7a8e000 ffffffff 00000018 00000006
>        c7b9a800 00000018 00000006 c7b9a800 c7b9a9e8 c7b9ab08 c7f7ee00 c01a371c
> Call Trace:    [<c01a3507>] [<c01a339e>] [<c01a371c>] [<c019f7a3>] [>c019949d>]
>   [<c0115a6a>] [<c01082bd>] [<c0105240>] [<c0105240>] [<c010a528>] [<c0105240>]
>   [<c0105240>] [<c0105263>] [<c01052d2>] [<c0105000>] [<c0105027>]
> Code: 89 50 04 89 02 8b 5c 24 24 c7 03 00 00 00 00 c7 43 04 00 00
> 
> 
> >>EIP; c01a5399 <sfq_dequeue+59/1b0>   <=====
> 
> >>esp; c021deb8 <init_task_union+1eb8/2000>
> 
> Trace; c01a3507 <htb_dequeue_tree+217/230>
> Trace; c01a339e <htb_dequeue_tree+ae/230>
> Trace; c01a371c <htb_dequeue+16c/250>
> Trace; c019f7a3 <qdisc_restart+13/d0>
> Trace; c0115a6a <do_softirq+5a/b0>
> Trace; c01082bd <do_IRQ+9d/b0>
> Trace; c0105240 <default_idle+0/30>
> Trace; c0105240 <default_idle+0/30>
> Trace; c010a528 <call_do_IRQ+5/d>
> Trace; c0105240 <default_idle+0/30>
> Trace; c0105240 <default_idle+0/30>
> Trace; c0105263 <default_idle+23/30>
> Trace; c01052d2 <cpu_idle+42/60>
> Trace; c0105000 <_stext+0/0>
> Trace; c0105027 <rest_init+27/30>
> 
> Code;  c01a5399 <sfq_dequeue+59/1b0>
> 00000000 <_EIP>:
> Code;  c01a5399 <sfq_dequeue+59/1b0>   <=====
>    0:   89 50 04                  mov    %edx,0x4(%eax)   <=====
> Code;  c01a539c <sfq_dequeue+5c/1b0>
>    3:   89 02                     mov    %eax,(%edx)
> Code;  c01a539e <sfq_dequeue+5e/1b0>
>    5:   8b 5c 24 24               mov    0x24(%esp,1),%ebx
> Code;  c01a53a2 <sfq_dequeue+62/1b0>
>    9:   c7 03 00 00 00 00         movl   $0x0,(%ebx)
> Code;  c01a53a8 <sfq_dequeue+68/1b0>
>    f:   c7 43 04 00 00 00 00      movl   $0x0,0x4(%ebx)
> 
>  <0>Kernel panic: Aiee, killing interrupt handler!
> ------------< snip <------< snip <------< snip <------------
> 
> Below are the rules that were installed on the system:
> 
> ------------< snip <------< snip <------< snip <------------
> /sbin/tc qdisc del dev eth0 root
> /sbin/tc qdisc del dev eth1 root
> /sbin/iptables -t mangle -F qos
> /sbin/iptables -t mangle -Z qos
> /sbin/tc qdisc add dev eth0 root handle 1: htb default 5 r2q 1
> /sbin/tc class add dev eth0 parent 1: classid 1:1 htb rate 96kbit
> /sbin/tc class add dev eth0 parent 1:1 classid 1:2 htb rate 96kbit ceil 96kbit
> /sbin/tc class add dev eth0 parent 1:2 classid 1:3 htb rate 48kbit ceil 96kbit prio 1
> /sbin/tc qdisc add dev eth0 handle 3: parent 1:3 sfq perturb 10 limit 31
> /sbin/tc class add dev eth0 parent 1:2 classid 1:4 htb rate 24kbit ceil 96kbit prio 1
> /sbin/tc qdisc add dev eth0 handle 4: parent 1:4 sfq perturb 10 limit 31
> /sbin/tc class add dev eth0 parent 1:2 classid 1:5 htb rate 16kbit ceil 96kbit prio 2
> /sbin/tc qdisc add dev eth0 handle 5: parent 1:5 sfq perturb 10 limit 31
> /sbin/iptables -t mangle -A qos -o eth0 -s 66.8.85.0/28 -j CLASSIFY --set-class 1:3
> /sbin/iptables -t mangle -A qos -o eth0 -s 66.8.85.80/28 -j CLASSIFY --set-class 1:4
> /sbin/iptables -t mangle -A qos -o eth0 -s 192.116.106.192/29 -j CLASSIFY --set-class 1:0
> /sbin/iptables -t mangle -A qos -o eth0 -s 66.8.28.48/29 -j CLASSIFY --set-class 1:0
> /sbin/tc qdisc add dev eth1 root handle 1: htb default 5 r2q 2
> /sbin/tc class add dev eth1 parent 1: classid 1:1 htb rate 512kbit
> /sbin/tc class add dev eth1 parent 1:1 classid 1:2 htb rate 256kbit ceil 512kbit
> /sbin/tc class add dev eth1 parent 1:2 classid 1:3 htb rate 128kbit ceil 512kbit prio 1
> /sbin/tc qdisc add dev eth1 handle 3: parent 1:3 sfq perturb 10 limit 169
> /sbin/tc class add dev eth1 parent 1:2 classid 1:4 htb rate 64kbit ceil 512kbit prio 1
> /sbin/tc qdisc add dev eth1 handle 4: parent 1:4 sfq perturb 10 limit 169
> /sbin/tc class add dev eth1 parent 1:2 classid 1:5 htb rate 32kbit ceil 512kbit prio 2
> /sbin/tc qdisc add dev eth1 handle 5: parent 1:5 sfq perturb 10 limit 169
> /sbin/iptables -t mangle -A qos -o eth1 -d 66.8.85.0/28 -j CLASSIFY --set-class 1:3
> /sbin/iptables -t mangle -A qos -o eth1 -d 66.8.85.80/28 -j CLASSIFY --set-class 1:4
> /sbin/iptables -t mangle -A qos -o eth1 -d 192.116.106.192/29 -j CLASSIFY --set-class 1:0
> /sbin/iptables -t mangle -A qos -o eth1 -d 66.8.28.48/29 -j CLASSIFY --set-class 1:0
> ------------< snip <------< snip <------< snip <------------
> 
> I've made tons of info available on my home page for you to look at (proc
> files, vmlinux, System.map, original panic message, etc.
> 
> http://oasis.frogfoot.net/sfq/
> 
> -- 
> 
> Regards
>  Abraham
> 
> I saw what you did and I know who you are.
> 
> ___________________________________________________
>  Abraham vd Merwe [ZR1BBQ] - Frogfoot Networks
>  P.O. Box 3472, Matieland, Stellenbosch, 7602
>  Cell: +27 82 565 4451 Http: http://www.frogfoot.net/
>  Email: abz@frogfoot.net
> 
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