linux-kernel - Re: dm-crypt with no_read_workqueue and no_write

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Date:   Wed, 23 Dec 2020 22:19:41 +0100
From:   "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To:     Ignat Korchagin <ignat@...udflare.com>
Cc:     Alasdair G Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        device-mapper development <dm-devel@...hat.com>,
        dm-crypt@...ut.de, linux-kernel <linux-kernel@...r.kernel.org>,
        Eric Biggers <ebiggers@...nel.org>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        kernel-team <kernel-team@...udflare.com>,
        Nobuto Murata <nobuto.murata@...onical.com>,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        linux-crypto <linux-crypto@...r.kernel.org>
Subject: Re: dm-crypt with no_read_workqueue and no_write_workqueue + btrfs
 scrub = BUG()

On 23.12.2020 22:09, Ignat Korchagin wrote:
(..)
> I've been looking into this for the last couple of days because of
> other reports [1].
> Just finished testing a possible solution. Will submit soon.

Thanks for looking into it.

By the way, on a bare metal I am actually hitting a different problem
(scheduling while atomic) when scrubbing a btrfs filesystem, just as one
of your users from that GitHub report had [1].

I've pasted that backtrace in my original Dec 14 message.

Thanks,
Maciej

[1]: https://github.com/cloudflare/linux/issues/1#issuecomment-736734243