Re: [mpls-linux-general] Problems with MPLS 128, kernel crash

[James R. L. <jl...@mi...>]

*sigh*

I have seen this before.  I must be doing something wrong with the way I
handle skbs.  I haven't been able to figure out what, but I must be doing
something wrong.

Jim

BTW ... impressive instructions :-)

On Tue, Apr 02, 2002 at 04:09:06PM +0200, pim...@in... wrote:
> Hi James,
> 
> I am able to crash the kernel (2.4.17+MPLS128+(ftos&dscp) patches from
> iptables-1.2.6a) if debugging is off.
> 
> Attached is the script that sets up the DS tree.
> 
> cat /proc/net/mpls* (only relevant bits)
> 0x00000003 0/0/0 2 SET_EXP(01) EXP2TC( EXP(0)->TC(ffff) EXP(1)->TC(00b8)
> EXP(2)->TC(0028) EXP(3)->TC(0030) EXP(4)->TC(0048) EXP(5)->TC(0050)
> EXP(6)->TC(0068) EXP(7)->TC(0070) ) PUSH(gen 21650) SET(eth2,10.0.4.1)
> T21650/1        0x00000003
> 
> traffic is mapped on T21650/1 via iptables (default gateway on table 2)
> 
> ping -f 10.0.2.2
> .... (couple packets are sent)
> *crash*
> 
> [console]
> length:4
> warning: kfree pased on skb still on list from 0xc01f9e18
> kernel BUG: at skbuff.c:321
> ...
> kernel panic: Aiee killing the interrupt handler...
> 
> I want to stress the fact that I am only able to reproduce it when
> debugging is off.
> Let me know if you need additional information/want me to test
> something.
> 
> Pim.
> 
> -- 
> Pim Van Heuven            Ghent University - IMEC
> Department  of  Information  Technology   (INTEC)
> Sint-Pietersnieuwstraat, 41 B-9000, Gent, Belgium
> pim...@in...
>         DiffServ/MPLS(RSVP-TE) for Linux:
>         http://dsmpls.atlantis.rug.ac.be
> #!/bin/bash
> # This script will set-up an example DS tree
> 
> IFACES="eth1 eth2 eth3" 
> TC=/usr/local/bin/tc
> 
> if test $# -gt 0
> then
>   case $1 in
>   s|-s) 
> 	if test $# -gt 1 
> 	then 
> 		$TC -s qdisc ls dev $2
> 	else
> 		for i in $IFACES; do echo "***"$i"***"	
> 		$TC -s qdisc ls dev eth2; done
> 	fi;;
>   d|-d) 
> 	if test $# -gt 1 
> 	then 
> 		$TC qdisc del root dev $2
> 		$TC filter del root dev $2
> 		$TC class del root dev $2
> 	else	
> 		for i in $IFACES; do 
> 		$TC qdisc del root dev $i
> 		$TC filter del root dev $i
> 		$TC class del root dev $i
> 		done
> 	fi;;
>   h|-h|--help|-help)
>         echo $0 
> 	echo "     -s show statistics"
> 	echo "     -d delete filters and qdiscs"
> 	echo "     install qdiscs and filers"
>   esac
>   exit
> else
> 
> #iptables -A OUTPUT -t mangle -p rsvp -o eth0 -j DROP
> 
> for i in $IFACES; do
> 
>   echo Configuring interface $i
> 
>   echo DSMARK on $i
>   $TC qdisc add dev $i root handle 1:0 dsmark indices 64 default_index 0 #tcindex classid 2.2 #set_tc_index 
> 
>   echo Main Filter on $i
>   $TC filter add dev $i parent 1:0 protocol mpls tcindex mask 0xfc shift 2
>   echo prio
> 
> ##### Set up of the proper qdisc on $i
> 
> # First a DSMARK qdisc is introduced in order to retrieve TOS from IP header
> #$TC qdisc add dev $i handle 1:0 root dsmark indices 64 #set_tc_index
> $TC filter add dev $i parent 1:0 protocol mpls prio 1 tcindex mask 0xfc shift 2 pass_on
> 
> # Second a CBQ qdisc is used in order to support EF, AF and BE classes
> $TC qdisc add dev $i parent 1:0 handle 2:0 cbq bandwidth 100Mbit cell 8 avpkt 1000 mpu 64
> $TC filter add dev $i parent 2:0 protocol mpls prio 1 tcindex mask 0xf0 shift 4 pass_on
> 
> ## Definition of the CBQ leaf classes to support AF, EF and BE
> echo AF1
> ## AF Class 1 specific setup
> $TC class add dev $i parent 2:0 classid 2:1 cbq bandwidth 100Mbit rate 15Mbit \
>     avpkt 1000 prio 5 allot 1514 weight 1.5Mbit maxburst 21 defmap 0 borrow
> $TC filter add dev $i parent 2:0 protocol mpls prio 1 handle 1 tcindex classid 2:1
> $TC qdisc add dev $i parent 2:1 gred setup DPs 3 default 2 grio
> # --- AF Class 1 DP 1---
>    $TC filter add dev $i parent 1:0 protocol mpls prio 1 handle 0x0a tcindex classid 1:111
>    $TC qdisc change dev $i parent 2:1 gred limit 600KB min 150KB max 450KB burst 200 \
>        avpkt 1000 bandwidth 100Mbit DP 1 probability 0.02 prio 2
> # --- AF Class 1 DP 2---
>    $TC filter add dev $i parent 1:0 protocol mpls prio 1 handle 0x0c tcindex classid 1:112
>    $TC qdisc change dev $i parent 2:1 gred limit 600KB min 150KB max 450KB burst 200 \
>        avpkt 1000 bandwidth 100Mbit DP 2 probability 0.04 prio 3
> 
> ## AF Class 2 specific setup
> echo AF2
> $TC class add dev $i parent 2:0 classid 2:2 cbq bandwidth 100Mbit rate 15Mbit \
>     avpkt 1000 prio 4 allot 1514 weight 1.5Mbit maxburst 21 defmap 0 borrow
> $TC filter add dev $i parent 2:0 protocol mpls prio 1 handle 2 tcindex classid 2:2
> $TC qdisc add dev $i parent 2:2 gred setup DPs 3 default 2 grio
> # --- AF Class 2 DP 1---
>    $TC filter add dev $i parent 1:0 protocol mpls prio 1 handle 0x12 tcindex classid 1:121
>    $TC qdisc change dev $i parent 2:2 gred limit 600KB min 150KB max 450KB burst 200 \
>        avpkt 1000 bandwidth 100Mbit DP 1 probability 0.02 prio 2
> # --- AF Class 2 DP 2---
>   $TC filter add dev $i parent 1:0 protocol mpls prio 1 handle 0x14 tcindex classid 1:122
>    $TC qdisc change dev $i parent 2:2 gred limit 600KB min 150KB max 450KB burst 200 \
>        avpkt 1000 bandwidth 100Mbit DP 2 probability 0.04 prio 3
> 
> ## AF Class 3 specific setup
> echo AF3
> $TC class add dev $i parent 2:0 classid 2:3 cbq bandwidth 100Mbit rate 15Mbit \
>     avpkt 1000 prio 3 allot 1514 weight 1.5Mbit maxburst 21 defmap 0 borrow
> $TC filter add dev $i parent 2:0 protocol mpls prio 1 handle 3 tcindex classid 2:3
> $TC qdisc add dev $i parent 2:3 gred setup DPs 3 default 2 grio
> # --- AF Class 3 DP 1---
>    $TC filter add dev $i parent 1:0 protocol mpls prio 1 handle 0x1a tcindex classid 1:131
>    $TC qdisc change dev $i parent 2:3 gred limit 600KB min 150KB max 450KB burst 200 \
>        avpkt 1000 bandwidth 100Mbit DP 1 probability 0.02 prio 2
> # --- AF Class 3 DP 2---
>    $TC filter add dev $i parent 1:0 protocol mpls prio 1 handle 0x1c tcindex classid 1:132
>    $TC qdisc change dev $i parent 2:3 gred limit 600KB min 150KB max 450KB burst 200 \
>        avpkt 1000 bandwidth 100Mbit DP 2 probability 0.04 prio 3
> 
> ## EF class specific setup
> echo EF
> $TC class add dev $i parent 2:0 classid 2:5 cbq bandwidth 100Mbit rate 10Mbit \
>     avpkt 1000 prio 1 bounded allot 1514 weight 1Mbit maxburst 10 defmap 0
> $TC qdisc add dev $i parent 2:5 pfifo limit 10
> $TC filter add dev $i parent 1:0 protocol mpls prio 1 handle 0x2e tcindex classid 1:151
> $TC filter add dev $i parent 2:0 protocol mpls prio 1 handle 5 tcindex classid 2:5
> 
> ## BE class specific setup
> echo BE
> $TC class add dev $i parent 2:0 classid 2:6 cbq bandwidth 100Mbit rate 30Mbit \
>     avpkt 1000 prio 7 allot 1514 weight 3Mbit maxburst 21 borrow
> $TC qdisc add dev $i parent 2:6 red limit 600KB min 150KB max 450KB burst 200 \
>     avpkt 1000 bandwidth 100Mbit probability 0.4
> $TC filter add dev $i parent 1:0 protocol mpls prio 1 handle 0x0 tcindex classid 1:161    
> $TC filter add dev $i parent 2:0 protocol mpls prio 1 handle 6 tcindex classid 2:6
> 
> ## OSPF - RSVP Pipe class specific setup
> echo OSPF \& RSVP filter
> $TC class add dev $i parent 2:0 classid 2:7 cbq bandwidth 100Mbit rate 1Mbit \
>     avpkt 1000 prio 1 bounded allot 1514 weight 1Mbit maxburst 10 defmap 0
> $TC qdisc add dev $i parent 2:5 pfifo limit 10
> $TC filter add dev $i parent 1:0 protocol mpls prio 1 handle 0x30 tcindex classid 1:171
> $TC filter add dev $i parent 2:0 protocol mpls prio 1 handle 7 tcindex classid 2:7
> 
> done
> 
> fi
> 
> 
> 
> 
> 


-- 
James R. Leu