linux-kernel - Re: 3.3.0-rc6-next20120305 net/ipv4/tcp_ipv4.c:930 suspicious rcu_dereference

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Message-Id: <20120307.151625.829659631072828076.davem@davemloft.net>
Date:	Wed, 07 Mar 2012 15:16:25 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	Valdis.Kletnieks@...edu, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 3.3.0-rc6-next20120305 net/ipv4/tcp_ipv4.c:930 suspicious
 rcu_dereference_check() usage!

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 07 Mar 2012 06:45:43 -0800

> [PATCH net-next] tcp: md5: correct a RCU lockdep splat
> 
> commit a8afca0329 (tcp: md5: protects md5sig_info with RCU) added a
> lockdep splat in tcp_md5_do_lookup() in case a timer fires a tcp
> retransmit.
> 
> At this point, socket lock is owned by the sofirq handler, not the user,
> so we should adjust a bit the lockdep condition, as we dont hold
> rcu_read_lock().
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Reported-by: Valdis Kletnieks <valdis.kletnieks@...edu>

Applied, thanks Eric.
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