From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A7D2C433EF for ; Mon, 20 Sep 2021 17:09:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 43A4D61B72 for ; Mon, 20 Sep 2021 17:09:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343950AbhITRK2 (ORCPT ); Mon, 20 Sep 2021 13:10:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:35192 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346547AbhITRHw (ORCPT ); Mon, 20 Sep 2021 13:07:52 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EFC1D615E4; Mon, 20 Sep 2021 16:55:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632156950; bh=mPzH7dwi4HSDoNaFO+ZhDJ7IBenIGGLkH9azm1yjzQg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jIVvn5kTlrydrZjkn/nAtxjtgoxVBIQkyYgeJaPwloO25WB8ZiMnDvorfUBlMhd+W hSYBXJQfg0+x9EArtsksok7XU0ibhmIX1cgqvKLvD2iGV+a58GbYbC/7FAwBu+Jdft +1lad34NbGOhXiIOOJW7Um/RMXOp2unAm4nIuVQ8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jon Maloy , Hoang Le , "David S. Miller" Subject: [PATCH 4.9 160/175] tipc: increase timeout in tipc_sk_enqueue() Date: Mon, 20 Sep 2021 18:43:29 +0200 Message-Id: <20210920163923.301957879@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163918.068823680@linuxfoundation.org> References: <20210920163918.068823680@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Hoang Le commit f4bb62e64c88c93060c051195d3bbba804e56945 upstream. In tipc_sk_enqueue() we use hardcoded 2 jiffies to extract socket buffer from generic queue to particular socket. The 2 jiffies is too short in case there are other high priority tasks get CPU cycles for multiple jiffies update. As result, no buffer could be enqueued to particular socket. To solve this, we switch to use constant timeout 20msecs. Then, the function will be expired between 2 jiffies (CONFIG_100HZ) and 20 jiffies (CONFIG_1000HZ). Fixes: c637c1035534 ("tipc: resolve race problem at unicast message reception") Acked-by: Jon Maloy Signed-off-by: Hoang Le Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/tipc/socket.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -1755,7 +1755,7 @@ static int tipc_backlog_rcv(struct sock static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, u32 dport, struct sk_buff_head *xmitq) { - unsigned long time_limit = jiffies + 2; + unsigned long time_limit = jiffies + usecs_to_jiffies(20000); struct sk_buff *skb; unsigned int lim; atomic_t *dcnt;