netdev - Re: Linux 3.1-rc9

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Date:	Thu, 3 Nov 2011 01:24:39 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
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>,
	Balazs Scheidler <bazsi@...abit.hu>,
	KOVACS Krisztian <hidden@...abit.hu>
Subject: Re: Linux 3.1-rc9

On Wed, 2 Nov 2011, Eric Dumazet wrote:
> On 02/11/2011 20:16, Simon Kirby wrote:
> 
>  
> > Actually, we have an anti-abuse daemon that injects blackhole routes, so
> > this makes sense. (The daemon was written before ipsets were merged and
> > normal netfilter rules make it fall over under attack.)
> > 
> > I'll try with this patch. Thanks!
> > 
> 
> 
> Thanks !
> 
> Here is the official submission, please add your 'Tested-by' signature
> when you can confirm problem goes away.
> 
> (It did here, when I injected random NULL returns from
> inet_csk_route_child_sock(), so I am confident this is the problem you hit )
> 
> [PATCH] net: add missing bh_unlock_sock() calls
> 
> Simon Kirby reported lockdep warnings and following messages :
> 
> [104661.897577] huh, entered softirq 3 NET_RX ffffffff81613740
> preempt_count 00000101, exited with 00000102?
> 
> [104661.923653] huh, entered softirq 3 NET_RX ffffffff81613740
> preempt_count 00000101, exited with 00000102?
> 
> Problem comes from commit 0e734419
> (ipv4: Use inet_csk_route_child_sock() in DCCP and TCP.)
> 
> If inet_csk_route_child_sock() returns NULL, we should release socket
> lock before freeing it.
> 
> Another lock imbalance exists if __inet_inherit_port() returns an error
> since commit 093d282321da ( tproxy: fix hash locking issue when using
> port redirection in __inet_inherit_port()) a backport is also needed for
> >= 2.6.37 kernels.
> 
> Reported-by: Dimon Kirby <sim@...tway.ca>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Tested-by: Eric Dumazet <eric.dumazet@...il.com>
> CC: Balazs Scheidler <bazsi@...abit.hu>
> CC: KOVACS Krisztian <hidden@...abit.hu>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>

You probably also want: CC: stable@...r.kernel.org

Thanks,

	tglx

> ---
>  net/dccp/ipv4.c     |    1 +
>  net/ipv4/tcp_ipv4.c |    1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
> index 332639b..90a919a 100644
> --- a/net/dccp/ipv4.c
> +++ b/net/dccp/ipv4.c
> @@ -433,6 +433,7 @@ 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;
>  }
> 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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