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From:   Darrell Enns <darrell@darrellenns.com>
Date:   Wed, 1 Sep 2021 11:28:54 -0700
Message-ID: <CAOaVUnUvKu7QC=nRUzj-nMYxEiUy7xcHx=e3J6vJsaQ_AkVzmw@mail.gmail.com>
Subject: Re: Backup failing with "failed to clone extents" error
To:     Andrei Borzenkov <arvidjaar@gmail.com>
Cc:     fdmanana@gmail.com, linux-btrfs <linux-btrfs@vger.kernel.org>
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> There was proposed patch to clear received_uuid on
> clearing read-only subvolume property, but it has never been applied.

Exactly this was about to be my next suggestion. I don't know all the
details, but it sounds like that makes sense if matching
received_uuid's is considered to mean the data is identical.

> What will surely work is cloning you root subvolume and switching to
> clone. If course you will need to restart all replication streams
> beginning with full send of new root. But as it looks like you will need
> to restart it anyway.

I will give this a try. Thank you very much for all your help diagnosing this!