Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755825Ab3CPRgL (ORCPT ); Sat, 16 Mar 2013 13:36:11 -0400 Received: from mail-pb0-f50.google.com ([209.85.160.50]:52525 "EHLO mail-pb0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751811Ab3CPRgJ (ORCPT ); Sat, 16 Mar 2013 13:36:09 -0400 Message-ID: <1363455366.29475.66.camel@edumazet-glaptop> Subject: Re: BUG: IPv4: Attempt to release TCP socket in state 1 From: Eric Dumazet To: dormando Cc: Cong Wang , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Date: Sat, 16 Mar 2013 10:36:06 -0700 In-Reply-To: <1363303174.29475.46.camel@edumazet-glaptop> References: <51356AC1.4090302@gmail.com> <1362460046.15793.111.camel@edumazet-glaptop> <1362494795.15793.113.camel@edumazet-glaptop> <1362663990.15793.208.camel@edumazet-glaptop> <1363301786.29475.40.camel@edumazet-glaptop> <1363303174.29475.46.camel@edumazet-glaptop> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1714 Lines: 59 On Fri, 2013-03-15 at 00:19 +0100, Eric Dumazet wrote: > Thanks thats really useful, we might miss to increment socket refcount > in a timer setup. > Hmm, please add following debugging patch as well diff --git a/include/net/sock.h b/include/net/sock.h index 14f6e9d..fe7c8a6 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -530,7 +530,9 @@ static inline void sock_hold(struct sock *sk) */ static inline void __sock_put(struct sock *sk) { - atomic_dec(&sk->sk_refcnt); + int newref = atomic_dec_return(&sk->sk_refcnt); + + BUG_ON(newref <= 0); } static inline bool sk_del_node_init(struct sock *sk) diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index 786d97a..a445e15 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -739,7 +739,7 @@ void inet_csk_prepare_forced_close(struct sock *sk) { /* sk_clone_lock locked the socket and set refcnt to 2 */ bh_unlock_sock(sk); - sock_put(sk); + __sock_put(sk); /* The below has to be done to allow calling inet_csk_destroy_sock */ sock_set_flag(sk, SOCK_DEAD); @@ -835,13 +835,13 @@ void inet_csk_listen_stop(struct sock *sk) * tcp_v4_destroy_sock(). */ tcp_sk(child)->fastopen_rsk = NULL; - sock_put(sk); + __sock_put(sk); } inet_csk_destroy_sock(child); bh_unlock_sock(child); local_bh_enable(); - sock_put(child); + __sock_put(child); sk_acceptq_removed(sk); __reqsk_free(req); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/