netdev - Re: Linux 3.1-rc9

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Date:	Wed, 02 Nov 2011 18:49:17 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Simon Kirby <sim@...tway.ca>, David Miller <davem@...emloft.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: Linux 3.1-rc9

Le mercredi 02 novembre 2011 à 18:27 +0100, Eric Dumazet a écrit :

> I believe it might come from commit 0e734419
> (ipv4: Use inet_csk_route_child_sock() in DCCP and TCP.)
> 
> In case inet_csk_route_child_sock() returns NULL, we dont release socket
> lock.
> 
> 

Yes, thats the problem. I am testing following patch :

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 0ea10ee..683d97a 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1510,6 +1510,7 @@ exit:
 	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 	return NULL;
 put_and_exit:
+	bh_unlock_sock(newsk);
 	sock_put(newsk);
 	goto exit;
 }


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