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

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Message-ID: <14dc9294-fa99-cad0-871b-b69f138e8ac9@acm.org>
Date:   Mon, 22 Jun 2020 19:16:15 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Luis Chamberlain <mcgrof@...nel.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 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.

Bart.