netdev - Re: boot crash in arp_error

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Message-ID: <20100528080531.GA9893@elte.hu>
Date:	Fri, 28 May 2010 10:05:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, torvalds@...ux-foundation.org,
	tglx@...utronix.de, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: boot crash in arp_error_report()


* David Miller <davem@...emloft.net> wrote:

> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Thu, 27 May 2010 22:18:24 +0200
> 
> > [PATCH] net: fix __neigh_event_send()
> > 
> > commit 7fee226ad23 (net: add a noref bit on skb dst) missed one spot
> > where an skb is enqueued, with a possibly not refcounted dst entry.
> > 
> > __neigh_event_send() inserts skb into arp_queue, so we must make sure
> > dst entry is refcounted, or dst entry can be freed by garbage collector
> > after caller exits from rcu protected section.
> > 
> > Reported-by: Ingo Molnar <mingo@...e.hu>
> > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> 
> Applied, thanks Eric.
> 
> Ingo can we get a confirmation that this fixes the bootup crash?

Sure, will let you know how it goes.

Thanks,

	Ingo
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