netdev - CBQ(but probably u32 filter bug), kernel "freeze", at least from 3.2.0

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Message-ID: <a680a8297b2f099eb713b266792b9b82@visp.net.lb>
Date:	Tue, 28 Aug 2012 07:50:01 +0300
From:	Denys Fedoryshchenko <denys@...p.net.lb>
To:	<netdev@...r.kernel.org>
Subject: CBQ(but probably u32 filter bug), kernel "freeze", at least from
 3.2.0

Hi

Got information from friend, confirmed that it crashed at least two my 
boxes also :)
3.0.5-rc1 is working fine, 3.4.1 , 3.2.0 from ubuntu  - crashing
No watchdog fired, and didn't got yet significant debugging 
information.

Very easy to reproduce:
1)run the script
2)ping 192.168.3.234

script:
DEV_OUT=eth0
ICMP="match ip protocol 1 0xff"
U32="protocol ip u32"
DST="match ip dst"
tc qdisc add dev $DEV_OUT root handle 1: cbq avpkt 1000 bandwidth 
100mbit
tc class add dev $DEV_OUT parent 1: classid 1:1 cbq rate 512kbit allot 
1500 prio 5 bounded isolated
tc filter add dev $DEV_OUT parent 1:              prio 3 $U32 $ICMP 
$DST 192.168.3.234 flowid 1:
tc qdisc add dev $DEV_OUT parent 1:1 sfq perturb 10

---
Denys Fedoryshchenko, Network Engineer, Virtual ISP S.A.L.
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