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Date:	Thu, 01 May 2008 14:33:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	yanek@...bofh.cz
Cc:	linux-net@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: PROBLEM: kernel lockup while changing TC rules

From: Jan 'yanek' Bortl <yanek@...bofh.cz>
Date: Thu, 1 May 2008 16:52:39 +0200

CC:'ing netdev@...r.kernel.org, where such reports belong.

> I have found this problem with today's git (2.6.25-00000-ge4c576b) and 2.6.25:
> 
> Network configuration:
> 
> +--------+         vlan20 +---------+ vlan80
> | laptop |----------------| router  |-----
> +--------+                +---------+ 
> laptop has address 192.168.243.10
> 
> Reproduce HOWTO:
> 
> 1. run http://ya.bofh.cz/archive/kernel-2.6-htbcrash/init.sh
> 2. start packet generator on laptop (any traffic targetted to router's vlan80)
> 3. run http://ya.bofh.cz/archive/kernel-2.6-htbcrash/crash.sh
> 
> Then machine lockup and afterwhile print these messages:
> 
> [  395.137697] BUG: soft lockup - CPU#0 stuck for 61s! [ksoftirqd/0:4]
> ...
> [  395.139871] Call Trace:
> [  395.139940]  <IRQ>  [<ffffffff8035ea7c>] ? rb_insert_color+0xbc/0xf0
> [  395.140012]  [<ffffffffa01f9cf6>] ? :sch_htb:htb_add_to_wait_tree+0xa6/0xc0
> [  395.140061]  [<ffffffffa01fb46f>] ? :sch_htb:htb_dequeue+0x47f/0x7f0
> [  395.140111]  [<ffffffffa01f9ec2>] ? :sch_htb:htb_activate_prios+0x122/0x140
> [  395.140160]  [<ffffffff804682f6>] ? __qdisc_run+0x216/0x240
> [  395.140207]  [<ffffffff804584e3>] ? dev_queue_xmit+0x2c3/0x390
> [  395.140253]  [<ffffffff8047db07>] ? ip_finish_output+0x117/0x2a0
> [  395.140300]  [<ffffffff8047dfe0>] ? ip_output+0x70/0xb0
> [  395.140344]  [<ffffffff8047ac68>] ? ip_forward_finish+0x38/0x50
> 
> and
> 
> [  527.210416] BUG: soft lockup - CPU#1 stuck for 61s! [tc:2848]
> ...
> [  527.212644] Call Trace:
> [  527.212715]  [<ffffffff803617ff>] ? __delay+0xf/0x30
> [  527.212759]  [<ffffffff80365a4c>] ? _raw_spin_lock+0x10c/0x180
> [  527.212805]  [<ffffffff804d90a6>] ? _spin_lock_bh+0x56/0x70
> [  527.212849]  [<ffffffff80467a3f>] ? qdisc_lock_tree+0x1f/0x30
> [  527.212895]  [<ffffffffa0228bb4>] ? :sch_sfq:sfq_init+0xf4/0x240
> [  527.212942]  [<ffffffff804693e4>] ? qdisc_create+0x154/0x250
> [  527.212987]  [<ffffffff804710d3>] ? nla_parse+0x33/0xf0
> [  527.213031]  [<ffffffff80469fd0>] ? tc_modify_qdisc+0x90/0x420
> [  527.213079]  [<ffffffff804603d9>] ? rtnetlink_rcv_msg+0x1e9/0x230
> [  527.213125]  [<ffffffff804601f0>] ? rtnetlink_rcv_msg+0x0/0x230
> 
> (full output here: http://ya.bofh.cz/archive/kernel-2.6-htbcrash/netconsole.txt)
> 
> kernel's config here: http://ya.bofh.cz/archive/kernel-2.6-htbcrash/config.txt
> dmesg after boot here: http://ya.bofh.cz/archive/kernel-2.6-htbcrash/dmesg.txt
> 
> 
> -- 
> Jan 'yanek' Bortl <yanek [at] ya.bofh. cz>
> http://ya.bofh.cz/ | jab: yanek [at] mitranet. cz
> -----------------------------------------------------------------
> "Maybe one day you will learn that your way is not the only way."
>                                         Opher [StarGate: The Nox]
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