LARTC - Jan 2005 - tc class ls dev (device) ... segfault.

Hello.
I have got strange problem with tc utility (iproute2-ss001007) on linux
2.4.18.
No matter what rules i am going to test, the resul of ''tc class
ls/show''
is always the same :
ATSLite ()# tc -s class ls dev eth1
do_page_fault() #2: sending SIGSEGV to tc for illegal read access from
00000000 (epc == 00000000, ra == 00408750)
Segmentation fault

tc -s qdisc ls , tc -s filter ls ... works well.
shaping, qos works well too.

Does anybody can help me with solving this problem?
Thx in advance.

ps.
I can''t change kernel etc .. coz it''s the only one kernel i
can run on AP
based on rtl8181 - planet wap-1963a

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On Thu, 13 Jan 2005 16:17:21 +0100 (CET)
netf@death.pl wrote:
> Hello.
> I have got strange problem with tc utility (iproute2-ss001007) on linux
> 2.4.18.
> No matter what rules i am going to test, the resul of ''tc class
ls/show''
> is always the same :
> ATSLite ()# tc -s class ls dev eth1
> do_page_fault() #2: sending SIGSEGV to tc for illegal read access from
> 00000000 (epc == 00000000, ra == 00408750)
> Segmentation fault
> 
> tc -s qdisc ls , tc -s filter ls ... works well.
> shaping, qos works well too.
> 
> Does anybody can help me with solving this problem?
> Thx in advance.
> 
> ps.
> I can''t change kernel etc .. coz it''s the only one kernel
i can run on AP
> based on rtl8181 - planet wap-1963a
Are you using a current version of the iproute2 utilities?
One of the bugs I fixed about 6 months ago when I took over maintance
was teaching tc about the builtin pfifo_fast qdisc.
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> Are you using a current version of the iproute2 utilities?
> One of the bugs I fixed about 6 months ago when I took over maintance
> was teaching tc about the builtin pfifo_fast qdisc.
>
Yes. I tested tc utility of iproute2 versions :
all 2.2.4 postfix''es, 2.4.7 postfix, 2.6.9 postfix and 2.6.10 ...
behavior of tc utility is always the same :( :

ATSLite ()# tc -Version
tc utility, iproute2-ss050112
ATSLite ()# tc class ls dev eth1
do_page_fault() #2: sending SIGSEGV to tc for illegal read access from
00000000 (epc == 00000000, ra == 00409b70)
Segmentation fault

and as I said in previous post other things related to tc (shaping,qos etc
etc) work well.
I have done a little research and examine a buggy place.

Problem is in q->print_copt(q,fp,tb[TCA_OPTIONS]) in print_class function
of tc_class.c file.

Unfortunatly i can''t use any debugger such as gdb coz i don''t
have enough
memory space.

It''s rtl8181 based Access Point (planet wap-1963a) with:
2 mb of flash memory
16mb of ram
MIPS architecture.

cat /proc/cpuinfo gives me:

system type             : Philips Nino
processor               : 0
cpu model               : R3000 V0.0
...
iproute2 was cross compiled with nonmips (nonmips.sf.net) cross compiler
gcc 3.3.3.

The rules being tested are :

#CLASS: download
#!/bin/sh
DEV=eth1
TC=/sbin/tc
U32="filter add dev $DEV protocol ip parent 1:0 prio 1 u32"
echo Delete previous root qdisc
$TC qdisc del dev $DEV root >/dev/null 2>&1

echo Add root qdisc
$TC qdisc add dev $DEV root handle 1: htb default 10
echo Add root class
$TC class add dev $DEV parent 1: classid 1:1 htb rate 12500kbps ceil
12500kbps burst 2k
echo Add default class
$TC class add dev $DEV parent 1:1 classid 1:0x10 htb rate 12500kbps ceil
12500kbps burst 2k
$TC qdisc add dev $DEV parent 1:0x10 handle 0x10: pfifo limit 5

 echo Add class download, que pfifo limit 5
 $TC class add dev $DEV parent 1:1 classid 1:0x20 htb rate 8kbps ceil
8kbps burst 2k prio 1
   echo Add client net
   $TC class add dev $DEV parent 1:0x20 classid 1:0x21 htb rate 8kbps ceil
8kbps burst 2k prio 1 quantum 1500
    $TC ${U32} match ip dst 192.168.200.2/32 flowid 1:0x21
    $TC qdisc add dev $DEV parent 1:0x21 handle 0x21: pfifo limit 5

I hope there is a solution.
thx in advance.

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