netdev - Re: [PATCH net] net: neighbour: add neighbour dead check for neigh_timer

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Date:	Wed, 18 Dec 2013 16:57:01 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>, <yoshfuji@...ux-ipv6.org>,
	<joe@...ches.com>, <vfalico@...hat.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net: neighbour: add neighbour dead check for neigh_timer_handler()

On 2013/12/18 16:41, Hannes Frederic Sowa wrote:
> On Wed, Dec 18, 2013 at 04:19:43PM +0800, Ding Tianhong wrote:
>> 0xffffffff812f8e29 <neigh_timer_handler+265>:   mov    0xe8(%rbx),%rax
>> 0xffffffff812f8e30 <neigh_timer_handler+272>:   mov    %rbp,%rsi
>> 0xffffffff812f8e33 <neigh_timer_handler+275>:   mov    %rbx,%rdi
>> 0xffffffff812f8e36 <neigh_timer_handler+278>:   callq  *0x8(%rax)						<-----crash
>> /usr/src/linux/net/core/neighbour.c: 877
>> 0xffffffff812f8e39 <neigh_timer_handler+281>:   lea    0x3c(%rbx),%rax
> 
> For me it looks like this:
> 
> %rax is neigh->ops and the function pointer solicit is NULL and causes the the
> page fault.
> 
> 
yes, it is. So I was trying to find the situation that may free the neighbour when
the timer is running, but I could not yet.

Regards
Ding

> 


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