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(2403-580d-fda1--299.ip6.aussiebb.net. [2403:580d:fda1::299]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b5fa9ff98csm285341795ad.3.2026.04.26.15.18.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 26 Apr 2026 15:18:58 -0700 (PDT) Message-ID: <07db83f8-5769-4aaf-9f54-2711ddad9eea@suse.com> Date: Mon, 27 Apr 2026 07:48:52 +0930 Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: corruption after block-group-tree conversion, how to recover? (data is readable) To: Thomas Debesse , linux-btrfs@vger.kernel.org References: Content-Language: en-US From: Qu Wenruo Autocrypt: addr=wqu@suse.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNGFF1IFdlbnJ1byA8d3F1QHN1c2UuY29tPsLAlAQTAQgAPgIbAwULCQgHAgYVCAkKCwIE FgIDAQIeAQIXgBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXVgBQkQ/lqxAAoJEMI9kfOh Jf6o+jIH/2KhFmyOw4XWAYbnnijuYqb/obGae8HhcJO2KIGcxbsinK+KQFTSZnkFxnbsQ+VY fvtWBHGt8WfHcNmfjdejmy9si2jyy8smQV2jiB60a8iqQXGmsrkuR+AM2V360oEbMF3gVvim 2VSX2IiW9KERuhifjseNV1HLk0SHw5NnXiWh1THTqtvFFY+CwnLN2GqiMaSLF6gATW05/sEd V17MdI1z4+WSk7D57FlLjp50F3ow2WJtXwG8yG8d6S40dytZpH9iFuk12Sbg7lrtQxPPOIEU rpmZLfCNJJoZj603613w/M8EiZw6MohzikTWcFc55RLYJPBWQ+9puZtx1DopW2jOwE0EWdWB rwEIAKpT62HgSzL9zwGe+WIUCMB+nOEjXAfvoUPUwk+YCEDcOdfkkM5FyBoJs8TCEuPXGXBO Cl5P5B8OYYnkHkGWutAVlUTV8KESOIm/KJIA7jJA+Ss9VhMjtePfgWexw+P8itFRSRrrwyUf E+0WcAevblUi45LjWWZgpg3A80tHP0iToOZ5MbdYk7YFBE29cDSleskfV80ZKxFv6koQocq0 vXzTfHvXNDELAuH7Ms/WJcdUzmPyBf3Oq6mKBBH8J6XZc9LjjNZwNbyvsHSrV5bgmu/THX2n g/3be+iqf6OggCiy3I1NSMJ5KtR0q2H2Nx2Vqb1fYPOID8McMV9Ll6rh8S8AEQEAAcLAfAQY AQgAJgIbDBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXWBBQkQ/lrSAAoJEMI9kfOhJf6o cakH+QHwDszsoYvmrNq36MFGgvAHRjdlrHRBa4A1V1kzd4kOUokongcrOOgHY9yfglcvZqlJ qfa4l+1oxs1BvCi29psteQTtw+memmcGruKi+YHD7793zNCMtAtYidDmQ2pWaLfqSaryjlzR /3tBWMyvIeWZKURnZbBzWRREB7iWxEbZ014B3gICqZPDRwwitHpH8Om3eZr7ygZck6bBa4MU o1XgbZcspyCGqu1xF/bMAY2iCDcq6ULKQceuKkbeQ8qxvt9hVxJC2W3lHq8dlK1pkHPDg9wO JoAXek8MF37R8gpLoGWl41FIUb3hFiu3zhDDvslYM4BmzI18QgQTQnotJH8= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 在 2026/4/27 06:53, Thomas Debesse 写道: > Hi, I just did a `btrfstune --convert-to-block-group-tree` conversion > operation on a btrfs filesystem and this corrupted the volume: > > ``` > [ 786.278571] BTRFS info (device dm-9): first mount of filesystem > [ 786.278595] BTRFS info (device dm-9): using crc32c (crc32c-intel) > checksum algorithm > [ 786.442781] BTRFS error (device dm-9): parent transid verify failed > on logical 9820282388480 mirror 2 wanted 5715946 found 5717327 > [ 786.448020] BTRFS error (device dm-9): parent transid verify failed > on logical 9820282388480 mirror 1 wanted 5715946 found 5717327 Unfortunately, transid mismatch is not reliably repairable. > [ 786.449543] BTRFS error (device dm-9): failed to read block groups: -5 > [ 786.481199] BTRFS error (device dm-9): open_ctree failed: -5 > ``` > > I can mount the btrfs volume with `mount -oro,rescue=all`, I can > browse the filesystem, and every file data I checked loocked fine. > > Here is the log when mounting with `-oro,rescue=all`: > > ``` > [ 2523.344235] BTRFS info (device dm-9): first mount of filesystem > [ 2523.344260] BTRFS info (device dm-9): using crc32c (crc32c-intel) > checksum algorithm > [ 2523.612830] BTRFS error (device dm-9: state C): parent transid > verify failed on logical 9820282388480 mirror 2 wanted 5715946 found > 5717327 > [ 2523.613372] BTRFS error (device dm-9: state C): parent transid > verify failed on logical 9820282388480 mirror 1 wanted 5715946 found > 5717327 > [ 2523.639263] BTRFS info (device dm-9: state C): enabling ssd optimizations > [ 2523.639268] BTRFS info (device dm-9: state C): disabling log replay > at mount time > [ 2523.639271] BTRFS info (device dm-9: state C): turning on async discard > [ 2523.639273] BTRFS info (device dm-9: state C): enabling free space tree > [ 2523.639276] BTRFS info (device dm-9: state C): ignoring bad roots > [ 2523.639278] BTRFS info (device dm-9: state C): ignoring data csums > ``` > > The log reports SSD optimization to be enabled because those drives > are bcache backing devices. Bcache was disabled throughout the > operation. > > I expect that recovering from backup would take 10 days, so I would > like to avoid that if possible. If there are ways to recompute the > broken metadata for example or other repair operation, I would prefer > doing that. I'm afraid restoring from backup is the only reliable solution. > > The system is running Ubuntu 24.04.4 with Linux 6.8.0-110-generic and > btrfs-progs 6.6.3-1.1build2. Unfortunately the btrfs-progs is too old, and possibility the root cause. There are some fixes in progs v6.15, thus it's strongly recommended to use progs newer than v6.15. Thanks, Qu > I can run rescue systems on removable > drives if newer tools are required to repair. > > Best regards, >