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[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> X-Rspamd-Queue-Id: A93D53EF10 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 X-Bogosity: Ham, tests=bogofilter, spamicity=0.002709, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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