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=-4.0 required=3.0 tests=BAYES_00,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 683A7C433B4 for ; Tue, 6 Apr 2021 16:40:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 42A12613D5 for ; Tue, 6 Apr 2021 16:40:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346517AbhDFQkl (ORCPT ); Tue, 6 Apr 2021 12:40:41 -0400 Received: from mail-ot1-f52.google.com ([209.85.210.52]:43005 "EHLO mail-ot1-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233687AbhDFQkj (ORCPT ); Tue, 6 Apr 2021 12:40:39 -0400 Received: by mail-ot1-f52.google.com with SMTP id c24-20020a9d6c980000b02902662e210895so14732422otr.9; Tue, 06 Apr 2021 09:40:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=D4Pxz8eQS4z/anoMDxcMYg0CMeoybJwFEHBQkyZRVlE=; b=NwYB8bwFibQ/UYGVbUE/O/mvbtvU5btwU3L+XamuX9svgHuFzjpTypDjzNCyeeKZE+ q0A+qpUYfgzOsbvojvlJphisJDSF/EAkT4JnClzYgLp/ypccSP27/sD2FK5X3O0T+pFx u5KWxmD2Mg/OqUaVV1ypZyYzfLmY/w5MXai9nX+7OEmCqHJiJjNmpyo8dYKp6KDDxrej l766rIE56uUi+7seu1ltnwRMEcvOrNdotdsEAfJdQ4qP0pGInxDpvOY8xGrnuauOa5k0 Lc0nYpGlPMTe/uIEhKlx6miXFwrNVlZHQDjGrtc07910HJQZkYL+rt1H/fpr3auK9gAO AOXQ== X-Gm-Message-State: AOAM530B9N8OI7ERSo8zPFJhJ9TkO9iVEyMf+Wr7JvpTSrfCvXXX1mqv AIq9paHOJxoCG2ETSSZXNX5c1FpYAsVjnaNWUS4oBLth52E= X-Google-Smtp-Source: ABdhPJzjEv/CKKmsBVnQ65Xz+D9PLnMYm7r3nNWaEx1H8YNdxV21Xq53ss1IQWbN/qP75roRv7aKZn34lTyfVfwdyiQ= X-Received: by 2002:a9d:4811:: with SMTP id c17mr28273387otf.206.1617727230873; Tue, 06 Apr 2021 09:40:30 -0700 (PDT) MIME-Version: 1.0 References: <845f6ef8-d2a7-e491-8405-9526e4ba277a@huawei.com> In-Reply-To: <845f6ef8-d2a7-e491-8405-9526e4ba277a@huawei.com> From: "Rafael J. Wysocki" Date: Tue, 6 Apr 2021 18:40:19 +0200 Message-ID: Subject: Re: [bug report] Memory leak from acpi_ev_install_space_handler() To: John Garry Cc: ACPI Devel Maling List , Len Brown , "Rafael J. Wysocki" , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 6, 2021 at 5:51 PM John Garry wrote: > > Hi guys, > > On next-20210406, I enabled CONFIG_DEBUG_KMEMLEAK and > CONFIG_DEBUG_TEST_DRIVER_REMOVE for my arm64 system, and see this: Why exactly do you think that acpi_ev_install_space_handler() leaks memory? > root@debian:/home/john# more /sys/kernel/debug/kmemleak > unreferenced object 0xffff202803c11f00 (size 128): > comm "swapper/0", pid 1, jiffies 4294894325 (age 337.524s) > hex dump (first 32 bytes): > 00 00 00 00 02 00 00 00 08 1f c1 03 28 20 ff ff............( .. > 08 1f c1 03 28 20 ff ff 00 00 00 00 00 00 00 00....( .......... > backtrace: > [<00000000670a0938>] slab_post_alloc_hook+0x9c/0x2f8 > [<00000000a3f47b39>] kmem_cache_alloc+0x198/0x2a8 > [<000000002bdba864>] acpi_os_create_semaphore+0x54/0xe0 > [<00000000bcd513fe>] acpi_ev_install_space_handler+0x24c/0x300 > [<0000000002e116e2>] acpi_install_address_space_handler+0x64/0xb0 > [<00000000ba00abc5>] i2c_acpi_install_space_handler+0xd4/0x138 > [<000000008da42058>] i2c_register_adapter+0x368/0x910 > [<00000000c03f7142>] i2c_add_adapter+0x9c/0x100 > [<0000000000ba2fcf>] i2c_add_numbered_adapter+0x44/0x58 > [<000000007df22d67>] i2c_dw_probe_master+0x68c/0x900 > [<00000000682dfc98>] dw_i2c_plat_probe+0x460/0x640 > [<00000000ad2dd3ee>] platform_probe+0x8c/0x108 > [<00000000dd183e3f>] really_probe+0x190/0x670 > [<0000000066017341>] driver_probe_device+0x8c/0xf8 > [<00000000c441e843>] device_driver_attach+0x9c/0xa8 > [<00000000f91dc709>] __driver_attach+0x88/0x138 > unreferenced object 0xffff00280452c100 (size 128): > comm "swapper/0", pid 1, jiffies 4294894558 (age 336.604s) > hex dump (first 32 bytes): > 00 00 00 00 02 00 00 00 08 c1 52 04 28 00 ff ff..........R.(... > 08 c1 52 04 28 00 ff ff 00 00 00 00 00 00 00 00..R.(........... > backtrace: > [<00000000670a0938>] slab_post_alloc_hook+0x9c/0x2f8 > [<00000000a3f47b39>] kmem_cache_alloc+0x198/0x2a8 > [<000000002bdba864>] acpi_os_create_semaphore+0x54/0xe0 > [<00000000bcd513fe>] acpi_ev_install_space_handler+0x24c/0x300 > [<0000000002e116e2>] acpi_install_address_space_handler+0x64/0xb0 > [<00000000988d4f61>] acpi_gpiochip_add+0x20c/0x4a0 > [<0000000073d4faab>] gpiochip_add_data_with_key+0xd10/0x1680 > [<000000001d50b98a>] devm_gpiochip_add_data_with_key+0x30/0x78 > [<00000000fc3e7eaf>] dwapb_gpio_probe+0x828/0xb28 > [<00000000ad2dd3ee>] platform_probe+0x8c/0x108 > [<00000000dd183e3f>] really_probe+0x190/0x670 > [<0000000066017341>] driver_probe_device+0x8c/0xf8 > [<00000000c441e843>] device_driver_attach+0x9c/0xa8 > [<00000000f91dc709>] __driver_attach+0x88/0x138 > [<00000000d330caed>] bus_for_each_dev+0xec/0x160 > [<00000000eebc5f04>] driver_attach+0x34/0x48 > root@debian:/home/john# > > Thanks, > John