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

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Message-ID: <20131218084106.GF27460@order.stressinduktion.org>
Date:	Wed, 18 Dec 2013 09:41:06 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Ding Tianhong <dingtianhong@...wei.com>
Cc:	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 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.

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