linux-kernel - BUG report about ipt_do

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Date:	Thu, 10 Oct 2013 13:16:05 +0800
From:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
To:	"'linux-arm-msm-owner@...r.kernel.org'" 
	<linux-arm-msm-owner@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	'Will Deacon' <will.deacon@....com>
Subject: BUG report about ipt_do_table( )

Dear all, 

We encounter a crash in ipt_do_table( ) function 
During our stability test .

The CPU is  qcom msm8960 / dual core  , linux kernel version is 3.4
I have add the two CPU's stack backtrace 
And the crash log .

CPU0 panic( )  in  ipt_do_table( )

Because it get a NULL jumpstack (ipt_entry * *) .

I don't know why it get this NULL value ,
Because the private (xt_table_info *) -> jumpstack[0]  is not NULL .

We have several crashes like this ,
So I think there must be some BUGs here , not hardware issue .

Every time , the panic happened , CPU1 is doing do_replace to replace the 
xt_table_info  info ,  so maybe this is caused by multicore data sync issue ?

CPU0 will see the  old xt_table_info   or the new one .

I am not very clear about ipt_do_table( ) work flow ,
Does  anyone can get some clues from the logs ?

Note:  I am not in linux mail-list now, hope you can add my mail-address
In your cc-loop when you reply to me , Thank you !

Thanks 

Yalin.Wang
Software Engineer 
OS Kernel&Graphics

Sony Mobile Communications
Tel: +86 10 5966 9819
Phone: 18610323092
Address: No.16 Guangshun South Street, Chaoyang, Beijing, P.R.C.

sonymobile.com

Download attachment "report.zip" of type "application/x-zip-compressed" (25346 bytes)