linux-kernel - Re: WARNING: at net/ipv4/af_inet.c:154 inet_sock

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Date:	Fri, 30 Oct 2009 15:55:51 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Francis Moreau <francis.moro@...il.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Netdev List <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: WARNING: at net/ipv4/af_inet.c:154 inet_sock_destruct

Francis Moreau a écrit :
> On Fri, Oct 30, 2009 at 1:33 PM, Francis Moreau <francis.moro@...il.com> wrote:
>> On Fri, Oct 30, 2009 at 12:27 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>>> This oops occurring again and again with SUNRPC finally gave me the right pointer.
>>>
>>> David, we added two years ago memory accounting to UDP, and this changed
>>> requirements about calling skb_free_datagram() in the right context.
>>>
>>> I wish we had an ASSERT_SOCK_LOCKED() debugging facility :(
>>>
>>> Francis, would you please test following patch ?
>> I'm applying it and testing it during a couple of days and see if
>> something wrong still happens.
> 
> Hmm, with the patch applied on a 2.6.32-rc5, my machine locks hard
> when starting nfsd.
> 

Please ignore/revert the last part of the patch (about net/sunrpc/xprtsock.c)

In xs_udp_data_ready() we really want to call skb_free_datagram(),
not skb_free_datagram_locked(), because socket is already locked.

Thanks

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 37c5475..d61be4a 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -883,7 +883,7 @@ static void xs_udp_data_ready(struct sock *sk, int len)
  out_unlock:
 	spin_unlock(&xprt->transport_lock);
  dropit:
+	skb_free_datagram(sk, skb);
-	skb_free_datagram_locked(sk, skb);
  out:
 	read_unlock(&sk->sk_callback_lock);
 }

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