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=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 7B8C9C433DF for ; Tue, 23 Jun 2020 16:56:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A9A82078A for ; Tue, 23 Jun 2020 16:56:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592931410; bh=cjEiAH1obg+QZUqB4SECDeacZFOCOFzZsfaNXAFBmn0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=2eQ3w1G31rmycxBnqPSGZTB3bg6C3N4+wdMzs8Io+NHkLOyDSvcsd3Coq2YGAPFUp e/TvE4BAZa5uTpcPgvZz06MR7JUFKUmXhuVqD+XGwdFV8/bidBjCbXwLLLxfh6PrgC BHkw9xcuTTN8qFHG6iBOfiI+0qCs1fdkK+buyaRw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733079AbgFWQ4s (ORCPT ); Tue, 23 Jun 2020 12:56:48 -0400 Received: from mail-pl1-f193.google.com ([209.85.214.193]:34568 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732292AbgFWQ4r (ORCPT ); Tue, 23 Jun 2020 12:56:47 -0400 Received: by mail-pl1-f193.google.com with SMTP id d12so3375945ply.1; Tue, 23 Jun 2020 09:56:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=JDvdZbZLgDkFFSdCv0TnjjXgUyD2AB2yEimWstVnawg=; b=uKhk2r5TqBmH0iwKPP5O1OBLcS3/eEY194eSg9VcRszPOEy9mlcPIQ6W1sgWFHaMVa 5S3LEiLsszIzLBkqYxpBY5YEpBC5KOlrnGE0ZKS5oBkdqc1rHISk865P7VL6G+hjIOcJ PRrp7zjuMf2VSEugGTJ94yJz0rZYzN0oi6PyZr6ztuOtcbB/iZ7C/eM4wPDzr8oaHNTH WSphVDOxArvWXhfuK0IG5KcX6P9zHr/VCeR7c2Jdsbh7PqJHdxd4NK29ScsAhvottX8O gMVL37MtOoiZuoyHLNNclCxF0W+twbsoE3O6f+HmTxO1MGxVv8I2p1pG1PHNG0kwjvn8 qREQ== X-Gm-Message-State: AOAM530D00WVK1pSyRN9N/XpGqcFekBIfHu0LTxuqiAAGSPGrTW1HAcv a7HSc3c6r9PWFy6J83tpo1U= X-Google-Smtp-Source: ABdhPJzCFTSHbh94OELz47L0BiNYIconLJwPLhznXY2yEus6l/oUG0gykNuFRS7NKmtbjU+o5z156w== X-Received: by 2002:a17:902:7045:: with SMTP id h5mr24682778plt.151.1592931407230; Tue, 23 Jun 2020 09:56:47 -0700 (PDT) Received: from 42.do-not-panic.com (42.do-not-panic.com. [157.230.128.187]) by smtp.gmail.com with ESMTPSA id t22sm2801970pjy.32.2020.06.23.09.56.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Jun 2020 09:56:45 -0700 (PDT) Received: by 42.do-not-panic.com (Postfix, from userid 1000) id 9E0F240430; Tue, 23 Jun 2020 16:56:44 +0000 (UTC) Date: Tue, 23 Jun 2020 16:56:44 +0000 From: Luis Chamberlain To: Bart Van Assche Cc: axboe@kernel.dk, viro@zeniv.linux.org.uk, gregkh@linuxfoundation.org, rostedt@goodmis.org, mingo@redhat.com, jack@suse.cz, ming.lei@redhat.com, nstange@suse.de, akpm@linux-foundation.org, mhocko@suse.com, yukuai3@huawei.com, martin.petersen@oracle.com, jejb@linux.ibm.com, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Hellwig Subject: Re: [PATCH v7 5/8] loop: be paranoid on exit and prevent new additions / removals Message-ID: <20200623165644.GB4332@42.do-not-panic.com> References: <20200619204730.26124-1-mcgrof@kernel.org> <20200619204730.26124-6-mcgrof@kernel.org> <7e76d892-b5fd-18ec-c96e-cf4537379eba@acm.org> <20200622122742.GU11244@42.do-not-panic.com> <14dc9294-fa99-cad0-871b-b69f138e8ac9@acm.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <14dc9294-fa99-cad0-871b-b69f138e8ac9@acm.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 22, 2020 at 07:16:15PM -0700, Bart Van Assche wrote: > On 2020-06-22 05:27, Luis Chamberlain wrote: > > Note: this will bring you sanity if you try to figure out *why* we still > > get: > > > > [235530.144343] debugfs: Directory 'loop0' with parent 'block' already present! > > [235530.149477] blktrace: debugfs_dir not present for loop0 so skipping > > [235530.232328] debugfs: Directory 'loop0' with parent 'block' already present! > > [235530.238962] blktrace: debugfs_dir not present for loop0 so skipping > > > > If you run run_0004.sh from break-blktrace [0]. Even with all my patches > > merged we still run into this. And so the bug lies within the block > > layer or on the driver. I haven't been able to find the issue yet. > > > > [0] https://github.com/mcgrof/break-blktrace > > Thanks Luis for having shared this information. If I can find the time I > will have a look into this myself. Let's keep track of it: https://bugzilla.kernel.org/show_bug.cgi?id=208301 Luis