From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yang Yingliang Subject: [PATCH RFC] net: decrease the length of backlog queue immediately after it's detached from sk Date: Wed, 30 Mar 2016 13:16:41 +0800 Message-ID: <1459315001-3448-1-git-send-email-yangyingliang@huawei.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , To: Return-path: Received: from szxga01-in.huawei.com ([58.251.152.64]:40199 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751342AbcC3FRM (ORCPT ); Wed, 30 Mar 2016 01:17:12 -0400 Sender: netdev-owner@vger.kernel.org List-ID: When task A hold the sk owned in tcp_sendmsg, if lots of packets arrive and the packets will be added to backlog queue. The packets will be handled in release_sock called from tcp_sendmsg. When the sk_backlog is removed from sk, the length will not decrease until all the packets in backlog queue are handled. This may leads to the new packets be dropped because the lenth is too big. So set the lenth to 0 immediately after it's detached from sk. Signed-off-by: Yang Yingliang --- net/core/sock.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/core/sock.c b/net/core/sock.c index 47fc8bb..108be05 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1933,6 +1933,7 @@ static void __release_sock(struct sock *sk) do { sk->sk_backlog.head = sk->sk_backlog.tail = NULL; + sk->sk_backlog.len = 0; bh_unlock_sock(sk); do { -- 2.5.0