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To:     Qu Wenruo <wqu@suse.com>
Subject: Re: Unmountable / uncheckable Fedora 34 btrfs: failed to read block  groups: -5 open_ctree failed
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Date:   Mon, 13 Sep 2021 03:16:44 -0400
From:   =?UTF-8?Q?Niccol=C3=B2_Belli?= <darkbasic@linuxsystems.it>
Cc:     Qu Wenruo <quwenruo.btrfs@gmx.com>, linux-btrfs@vger.kernel.org
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Il 2021-09-12 19:55 Qu Wenruo ha scritto:
> During the backup, have you checked the dmesg?

Yes, the only error was the "No space left" I mentioned in the previous 
message.