netdev - Re: Next Sept 7: Bug : skb_release_head

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Date:	Tue, 08 Sep 2009 10:39:43 +0530
From:	Sachin Sant <sachinp@...ibm.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev <netdev@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: Next Sept 7: Bug : skb_release_head_state on x86

Eric Dumazet wrote:
> and you decode a 64 bits kernel
>   
OOPS. Sorry about that. I had next running on 32 and 64
bit machines and goofed up while collecting the disassembly.

> This is more probably
>
> <f0> ff 0a       lock decl (%edx)
>
> part of : 
>
> secpath_put(skb->sp);
>   
Yup this is what shows up when looking at correct disassembly.

>
> So some skb has a strange/buggy skb->sp (value 0x00010090)
>
> It looks like skb->cb[xxx] overwrote skb->sp
>
> Please check you have CONFIG_XFRM=y, and that you did rebuild all your modules after
> patching your kernel...
>   
Yes, CONFIG_XFRM is enabled. Earlier next kernels did not have this problem.
The last one i tried successfully was 0902. 0904 had some build failure
(related to net/3c503.c) hence could not boot test that.

Will try to boot 0904 and will check if the same problem can be recreated.

I have attached the config file used.

Thanks
-Sachin

-- 

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------


View attachment "config_next0907" of type "text/plain" (95334 bytes)