linux-kernel - Re: [PATCH v7 5/8] loop: be paranoid on exit and prevent new additions / removals

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Message-ID: <20200623165644.GB4332@42.do-not-panic.com>
Date:   Tue, 23 Jun 2020 16:56:44 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     axboe@...nel.dk, viro@...iv.linux.org.uk,
        gregkh@...uxfoundation.org, rostedt@...dmis.org, mingo@...hat.com,
        jack@...e.cz, ming.lei@...hat.com, nstange@...e.de,
        akpm@...ux-foundation.org, mhocko@...e.com, yukuai3@...wei.com,
        martin.petersen@...cle.com, jejb@...ux.ibm.com,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v7 5/8] loop: be paranoid on exit and prevent new
 additions / removals

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