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=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,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 4291CC28CC2 for ; Thu, 30 May 2019 04:54:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1C5F625E93 for ; Thu, 30 May 2019 04:54:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559192060; bh=dRaay6V38ZQBoS8zKbaAnrP+HlvFnkld7aAPcWP7vLc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=PRBKIQEfGVS3mP8hTu8pvAuO2Ynp0RXIaa6WuaP2bvdywxyMvGlhzizt9rYhYSJJi nT+Qgn2DsbAOG9G1JEaEmx1wDGKXgjm8p7yQNu9dvorEXOYwFhfLxuYhdljI0Quap1 cEO4ShUjBDV4L1/Rex7rj2vtPlty6KLSrGtkF1gI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728091AbfE3DK0 (ORCPT ); Wed, 29 May 2019 23:10:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:45550 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727824AbfE3DJv (ORCPT ); Wed, 29 May 2019 23:09:51 -0400 Received: from localhost (ip67-88-213-2.z213-88-67.customer.algx.net [67.88.213.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 10CB62447C; Thu, 30 May 2019 03:09:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559185791; bh=dRaay6V38ZQBoS8zKbaAnrP+HlvFnkld7aAPcWP7vLc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BeTGa269w6xvblCLUkQFD+dNtBeHGXB8RFu9D2WABYUOK+5VnhqehEzNKF2rQh8S0 U5CeEqNb6LDOaAN2UFyghaghW8POlNMmwpTjVXYznfB0tdst8CLVuMnj6upnArLv1I KjL5pkWRtjBewKDFohPDfqG3Pf4e3yUwAQAcDASY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ross Lagerwall , Andreas Gruenbacher , Sasha Levin Subject: [PATCH 5.1 045/405] gfs2: Fix lru_count going negative Date: Wed, 29 May 2019 20:00:43 -0700 Message-Id: <20190530030543.087811743@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190530030540.291644921@linuxfoundation.org> References: <20190530030540.291644921@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit 7881ef3f33bb80f459ea6020d1e021fc524a6348 ] Under certain conditions, lru_count may drop below zero resulting in a large amount of log spam like this: vmscan: shrink_slab: gfs2_dump_glock+0x3b0/0x630 [gfs2] \ negative objects to delete nr=-1 This happens as follows: 1) A glock is moved from lru_list to the dispose list and lru_count is decremented. 2) The dispose function calls cond_resched() and drops the lru lock. 3) Another thread takes the lru lock and tries to add the same glock to lru_list, checking if the glock is on an lru list. 4) It is on a list (actually the dispose list) and so it avoids incrementing lru_count. 5) The glock is moved to lru_list. 5) The original thread doesn't dispose it because it has been re-added to the lru list but the lru_count has still decreased by one. Fix by checking if the LRU flag is set on the glock rather than checking if the glock is on some list and rearrange the code so that the LRU flag is added/removed precisely when the glock is added/removed from lru_list. Signed-off-by: Ross Lagerwall Signed-off-by: Andreas Gruenbacher Signed-off-by: Sasha Levin --- fs/gfs2/glock.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index d32964cd11176..e4f6d39500bcc 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -183,15 +183,19 @@ static int demote_ok(const struct gfs2_glock *gl) void gfs2_glock_add_to_lru(struct gfs2_glock *gl) { + if (!(gl->gl_ops->go_flags & GLOF_LRU)) + return; + spin_lock(&lru_lock); - if (!list_empty(&gl->gl_lru)) - list_del_init(&gl->gl_lru); - else + list_del(&gl->gl_lru); + list_add_tail(&gl->gl_lru, &lru_list); + + if (!test_bit(GLF_LRU, &gl->gl_flags)) { + set_bit(GLF_LRU, &gl->gl_flags); atomic_inc(&lru_count); + } - list_add_tail(&gl->gl_lru, &lru_list); - set_bit(GLF_LRU, &gl->gl_flags); spin_unlock(&lru_lock); } @@ -201,7 +205,7 @@ static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl) return; spin_lock(&lru_lock); - if (!list_empty(&gl->gl_lru)) { + if (test_bit(GLF_LRU, &gl->gl_flags)) { list_del_init(&gl->gl_lru); atomic_dec(&lru_count); clear_bit(GLF_LRU, &gl->gl_flags); @@ -1159,8 +1163,7 @@ void gfs2_glock_dq(struct gfs2_holder *gh) !test_bit(GLF_DEMOTE, &gl->gl_flags)) fast_path = 1; } - if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl) && - (glops->go_flags & GLOF_LRU)) + if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl)) gfs2_glock_add_to_lru(gl); trace_gfs2_glock_queue(gh, 0); @@ -1456,6 +1459,7 @@ __acquires(&lru_lock) if (!spin_trylock(&gl->gl_lockref.lock)) { add_back_to_lru: list_add(&gl->gl_lru, &lru_list); + set_bit(GLF_LRU, &gl->gl_flags); atomic_inc(&lru_count); continue; } @@ -1463,7 +1467,6 @@ __acquires(&lru_lock) spin_unlock(&gl->gl_lockref.lock); goto add_back_to_lru; } - clear_bit(GLF_LRU, &gl->gl_flags); gl->gl_lockref.count++; if (demote_ok(gl)) handle_callback(gl, LM_ST_UNLOCKED, 0, false); @@ -1498,6 +1501,7 @@ static long gfs2_scan_glock_lru(int nr) if (!test_bit(GLF_LOCK, &gl->gl_flags)) { list_move(&gl->gl_lru, &dispose); atomic_dec(&lru_count); + clear_bit(GLF_LRU, &gl->gl_flags); freed++; continue; } -- 2.20.1