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=-10.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 40D1CC433EF for ; Thu, 9 Sep 2021 04:07:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 18E7F61090 for ; Thu, 9 Sep 2021 04:07:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232005AbhIIEI1 (ORCPT ); Thu, 9 Sep 2021 00:08:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46308 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230254AbhIIEIZ (ORCPT ); Thu, 9 Sep 2021 00:08:25 -0400 Received: from out2.migadu.com (out2.migadu.com [IPv6:2001:41d0:2:aacc::]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB0F6C061575 for ; Wed, 8 Sep 2021 21:07:16 -0700 (PDT) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1631160435; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=wo9UEsRIayeSrouu7jDNAqNpavMOIBmAOXW7MpQG1Qc=; b=X1QkGEnZY16UCC+D+0DR8GlL5y+M33D1FQs1uEjmG0v0eQC4BiTsoTBJ7QmcCwWZUxOmqH MZXCp508zeLcZKwoHnaQuhr6f9ZfmP1PubGUr2S8ueQ5V1FkkvSj3eSxkHMxilPud+kk5e IAaXEWHEv3EI/l+wdhmrjjKbxH1UIqI= From: Guoqing Jiang Subject: bfq - suspected memory leaks To: Jens Axboe , paolo.valente@linaro.org Cc: linux-block@vger.kernel.org Message-ID: <72691728-304b-a80b-5850-92879fffc61a@linux.dev> Date: Thu, 9 Sep 2021 12:07:10 +0800 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: guoqing.jiang@linux.dev Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hi, With latest kernel (commit 4ac6d90867a4 "Merge tag 'docs-5.15' of git://git.lwn.net/linux"), I got lots of kmemleak reports during compile kernel source code. # dmesg |grep kmemleak [18234.655491] kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [18890.247552] kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [19745.602271] kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [20390.965851] kmemleak: 4 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [21150.173950] kmemleak: 4 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [21929.951448] kmemleak: 15 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [23589.726859] kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [24416.441263] kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [30400.835853] kmemleak: 10 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [68673.737862] kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [72770.498898] kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak) [77046.434369] kmemleak: 7 new suspected memory leaks (see /sys/kernel/debug/kmemleak) All of them  have similar trace as follows.   comm "sh", pid 27054, jiffies 4302241171 (age 47562.964s)   hex dump (first 32 bytes):     01 00 00 00 00 00 00 00 00 b0 20 02 80 88 ff ff  .......... .....     04 00 02 00 04 00 02 00 00 00 00 00 00 00 00 00 ................   backtrace:     [<000000004fa2550b>] bfq_get_queue+0x2a8/0xfd0     [<00000000b1757a70>] bfq_get_bfqq_handle_split+0xa4/0x240     [<00000000ac263274>] bfq_init_rq+0x1f7/0x1d10     [<00000000110283e1>] bfq_insert_requests+0xf7/0x5f0     [<000000002ed06e79>] blk_mq_sched_insert_requests+0xfe/0x350     [<000000000ebf38ac>] blk_mq_flush_plug_list+0x256/0x3e0     [<00000000bc647b2b>] blk_flush_plug_list+0x1ff/0x240     [<000000004e7e49f8>] blk_finish_plug+0x3c/0x60     [<000000008802f1e4>] read_pages+0x28f/0x580     [<000000009986d1f4>] page_cache_ra_unbounded+0x266/0x3a0     [<00000000492c494f>] filemap_fault+0x8a8/0xfe0     [<000000009cbd8d38>] __do_fault+0x70/0x150     [<000000002740a35f>] do_fault+0x112/0x670     [<00000000a74facab>] __handle_mm_fault+0x57e/0xcc0     [<0000000024009667>] handle_mm_fault+0xd6/0x330     [<00000000fb1e0780>] do_user_addr_fault+0x2a9/0x8b0 unreferenced object 0xffff888021e5dd90 (size 560): Thanks, Guoqing