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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 F2BAFC6778A for ; Sun, 1 Jul 2018 18:00:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B54232580A for ; Sun, 1 Jul 2018 18:00:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B54232580A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965813AbeGAR77 (ORCPT ); Sun, 1 Jul 2018 13:59:59 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:34770 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030387AbeGAQa0 (ORCPT ); Sun, 1 Jul 2018 12:30:26 -0400 Received: from localhost (LFbn-1-12247-202.w90-92.abo.wanadoo.fr [90.92.61.202]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 1A065ACD; Sun, 1 Jul 2018 16:30:25 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tejun Heo , Joshua Miller , Johannes Weiner , Jan Kara , Miklos Szeredi Subject: [PATCH 4.14 030/157] fuse: fix congested state leak on aborted connections Date: Sun, 1 Jul 2018 18:21:42 +0200 Message-Id: <20180701160853.845542816@linuxfoundation.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180701160852.287307684@linuxfoundation.org> References: <20180701160852.287307684@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tejun Heo commit 8a301eb16d99983a4961f884690ec97b92e7dcfe upstream. If a connection gets aborted while congested, FUSE can leave nr_wb_congested[] stuck until reboot causing wait_iff_congested() to wait spuriously which can lead to severe performance degradation. The leak is caused by gating congestion state clearing with fc->connected test in request_end(). This was added way back in 2009 by 26c3679101db ("fuse: destroy bdi on umount"). While the commit description doesn't explain why the test was added, it most likely was to avoid dereferencing bdi after it got destroyed. Since then, bdi lifetime rules have changed many times and now we're always guaranteed to have access to the bdi while the superblock is alive (fc->sb). Drop fc->connected conditional to avoid leaking congestion states. Signed-off-by: Tejun Heo Reported-by: Joshua Miller Cc: Johannes Weiner Cc: stable@vger.kernel.org # v2.6.29+ Acked-by: Jan Kara Signed-off-by: Miklos Szeredi Signed-off-by: Greg Kroah-Hartman --- fs/fuse/dev.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -381,8 +381,7 @@ static void request_end(struct fuse_conn if (!fc->blocked && waitqueue_active(&fc->blocked_waitq)) wake_up(&fc->blocked_waitq); - if (fc->num_background == fc->congestion_threshold && - fc->connected && fc->sb) { + if (fc->num_background == fc->congestion_threshold && fc->sb) { clear_bdi_congested(fc->sb->s_bdi, BLK_RW_SYNC); clear_bdi_congested(fc->sb->s_bdi, BLK_RW_ASYNC); }