From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout.gmx.net (mout.gmx.net [212.227.15.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4EA087EB for ; Tue, 19 Mar 2024 00:06:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=212.227.15.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710806821; cv=none; b=enZH6jyvmUWXdlFObhvdOwLZLiRk5b7QQwZFiG/O1dyCI/PdMqGJoj9dFPtbj/w6LurtMEUo7Oe0KqtEWkkcqN7J5cd0MqXzDLYefNUnbBDQGz2nVEODL1hA2y1ZLsmBjQMDvs1TjE7qBsSAdn9/fBWl0kBiG3uulCr6LiS5SGs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710806821; c=relaxed/simple; bh=Yuc3Ix7LoBQuP3nw1Y+CRbnO1zzGPKQtgcfbJGFODtw=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=FLU+nMEQr1exoBH1SwXyCsRcLba22JHNdS7tnfkTV3Xo4PqgcoAdHFRY45NYVbwKwGqpZs/Ik2yhmDPY8kSYWZiVk17iZivkXv/JioaL3Z2VxFTeCjis3+jbdNwVaav+mtxciJFaUcCOfQio/rFkSEgT/kDLS9UQRYuSIIZkXWk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.com; spf=pass smtp.mailfrom=gmx.com; dkim=pass (2048-bit key) header.d=gmx.com header.i=quwenruo.btrfs@gmx.com header.b=aUcqXoPL; arc=none smtp.client-ip=212.227.15.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmx.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmx.com header.i=quwenruo.btrfs@gmx.com header.b="aUcqXoPL" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmx.com; s=s31663417; t=1710806813; x=1711411613; i=quwenruo.btrfs@gmx.com; bh=WSqfDV7Bq2AK/2zZvuABYuCc3kAN6tl/+GjhK3JXtOU=; h=X-UI-Sender-Class:Date:Subject:To:References:From:In-Reply-To; b=aUcqXoPLQv4oKd5VVz6BbPctiVBEu9lUp7/yp6v4BjnNXoG9wxphFEJptVF9w0w1 NnO1j1N4lPDeWJSe26wLDdVNzaV+uCbmzBiarbDnottPr72mdJqxh10eMqZnLAMTX wTXJrrCEeQdT/wPf0F9XnWC0zpFMV5LfXj0tP8MhkYpOAsqJFBkvLJNJXriOM/sQx yiwIvtNjV6eNLnICG42rhCjfaLs0egQ9gqXUFeCSGBPL+T/x4SOWrsXWEVXhM8aTc w09JoEVGAhf1QVg9iKiP3EbeTE5E5mQG2vzMOzgz+yYk3i4t5Hgm5X0RupheWO/jW wv+Y/746E/kJxvF12g== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from [172.16.0.219] ([159.196.52.54]) by mail.gmx.net (mrgmx004 [212.227.17.184]) with ESMTPSA (Nemesis) id 1MOA3P-1rOMtg0zcn-00OXbv; Tue, 19 Mar 2024 01:06:53 +0100 Message-ID: Date: Tue, 19 Mar 2024 10:36:50 +1030 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: Help requested: btrfs can't read superblock Content-Language: en-US To: kind.moon1862@fastmail.com, linux-btrfs@vger.kernel.org References: <37de8ead-fefa-4fab-a0ed-bbdb2bf15cf4@app.fastmail.com> From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCY00iVQUJDToH pgAKCRDCPZHzoSX+qNKACACkjDLzCvcFuDlgqCiS4ajHAo6twGra3uGgY2klo3S4JespWifr BLPPak74oOShqNZ8yWzB1Bkz1u93Ifx3c3H0r2vLWrImoP5eQdymVqMWmDAq+sV1Koyt8gXQ XPD2jQCrfR9nUuV1F3Z4Lgo+6I5LjuXBVEayFdz/VYK63+YLEAlSowCF72Lkz06TmaI0XMyj jgRNGM2MRgfxbprCcsgUypaDfmhY2nrhIzPUICURfp9t/65+/PLlV4nYs+DtSwPyNjkPX72+ LdyIdY+BqS8cZbPG5spCyJIlZonADojLDYQq4QnufARU51zyVjzTXMg5gAttDZwTH+8LbNI4 mm2YzsBNBFnVga8BCACqU+th4Esy/c8BnvliFAjAfpzhI1wH76FD1MJPmAhA3DnX5JDORcga CbPEwhLj1xlwTgpeT+QfDmGJ5B5BlrrQFZVE1fChEjiJvyiSAO4yQPkrPVYTI7Xj34FnscPj /IrRUUka68MlHxPtFnAHr25VIuOS41lmYKYNwPNLRz9Ik6DmeTG3WJO2BQRNvXA0pXrJH1fN GSsRb+pKEKHKtL1803x71zQxCwLh+zLP1iXHVM5j8gX9zqupigQR/Cel2XPS44zWcDW8r7B0 q1eW4Jrv0x19p4P923voqn+joIAostyNTUjCeSrUdKth9jcdlam9X2DziA/DHDFfS5eq4fEv ABEBAAHCwHwEGAEIACYCGwwWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCY00ibgUJDToHvwAK CRDCPZHzoSX+qK6vB/9yyZlsS+ijtsvwYDjGA2WhVhN07Xa5SBBvGCAycyGGzSMkOJcOtUUf tD+ADyrLbLuVSfRN1ke738UojphwkSFj4t9scG5A+U8GgOZtrlYOsY2+cG3R5vjoXUgXMP37 INfWh0KbJodf0G48xouesn08cbfUdlphSMXujCA8y5TcNyRuNv2q5Nizl8sKhUZzh4BascoK DChBuznBsucCTAGrwPgG4/ul6HnWE8DipMKvkV9ob1xJS2W4WJRPp6QdVrBWJ9cCdtpR6GbL iQi22uZXoSPv/0oUrGU+U5X4IvdnvT+8viPzszL5wXswJZfqfy8tmHM85yjObVdIG6AlnrrD In-Reply-To: <37de8ead-fefa-4fab-a0ed-bbdb2bf15cf4@app.fastmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:3RwLIPniQWy5LYf+9kg38H0AlypVAgvXyx5gIxq8x4+cO9NRamM y37VgOvNwCWnjakVry8ezx9LF59G189V9E4UMNkN8Ivvk1yfWaHuZAWUSAYxqWdNfJ+Xkae JhIympWl6GhkFYzNPgf5GJthw48dLjoEn6t5vdPo6ifeiyfilgHzavCAH5imHNF8/uKyZQH yeqH1lxnF5aeaZiyUFKTg== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:dGFsWR8fBBM=;Lk1F4P4+NuvF01+o4BaW3TuZzYQ IdwF3DDB3amlErYaZW21yLTuJ0OecazuXvU1UUfXBd/jpjhhFZI66En3KsydLGuC68xaYWl8i /EQwP3fWeG+QPcJoziq8Udius+Rl/04aQJT94gKXbWRm5F/tLujmbRTxikFSvqDu0PVwIGPKx fLRE93CLhC5JjdLJLpCFeL1mkMq6vpB0xE0Kgb3uIfiN2lWV+YCXanZ2q+3oa+bnCNl/AgGNf ddntatAQDts6HLLTZYqhQKmBre38e2XCv1wg2ULIzaA6jEpPd2AyWK2YUbj9/t8qd8tNpqmnG YBVtJAu4z9+8Uz4VAU29ogIMHcJRHSlcZ1LxHcjcJREEMZghD7R1qNIfgfXeZ953iWS4C6cpw kTU22qEBMINwyxr9h+Hz+eeNfZe4C3NIjj8E3TuTGAYFGpPW8GhjxHADY0HZNLRB7MgbNKQ7K lTCmzqUozDfpSGSv8KczyQXxo8JCcEEIjdAnrEG4OEPzXZxWh4YkFC9eLHNnRuJYMnmPV0ZDF cjkueU+qG0ULfQDZ+UjTvnoprTJHFZEN/+QhbtVHz+afTpeixjHVeoUy5PViHLRHz1wdEEyU2 8huUl78W5hTf469ojZv+FTwehEmrEIT4GiP8d6NIk9zce9IiReeSWWPrXcy5XU6VRvi7I/YkV JGyIzLznW9RyxFByXO19Qn/WZZb94Cf84kTL1qO6KaBCRUmwfgSKem3sSeLrmraXj+s2iKO5k k4FLRllWXczTHuXkxJxvhlHs7zZO5gf34cLK7GuaVYfATA+qpr/jiPoN6sRqfLpE8dma8M9Y4 QJ1+KacxGYgE8L40plCARn/tHk+Dvaj8Z0O5uZggFW6uE= =E5=9C=A8 2024/3/19 07:52, kind.moon1862@fastmail.com =E5=86=99=E9=81=93: > > Dear btrfs team, > > I've been asked to help someone with a btrfs problem. They use CentOS 7= . I've been told the host was shut down cleanly, but it won't mount a btr= fs filesystem when powering on. > > Below is what I've done so far. Any guidance would be appreciated! > > I booted using SystemRescue 11.0. Some info about the rescue OS: > > # uname -a > Linux sysrescue 6.6.14-1-lts #1 SMP PREEMPT_DYNAMIC Fri, 26 Jan 2024 11:= 54:58 +0000 x86_64 GNU/Linux > > # btrfs --version > btrfs-progs v6.6.3 > > Here are the disks: > > # btrfs fi show > Label: '' uuid: 834b4bfd-fbd4-40b9-8868-d1187c3c5a63 > Total devices 4 FS bytes used 17.44TiB > devid 1 size 9.10TiB used 8.94TiB path /dev/sda > devid 2 size 9.10TiB used 8.94TiB path /dev/sdb > devid 3 size 9.10TiB used 8.94TiB path /dev/sdc > devid 4 size 9.10TiB used 8.94TiB path /dev/sdd > > I tried mounting: > > # mount -t btrfs -o recovery,ro /dev/sda /mnt/data > mount: /mnt/data: can't read superblock on /dev/sda. > dmesg(1) may have more information after failed mount system cal= l. Use "mount -o rescue=3Dall,ro" instead. > > dmesg shows this: > > [ 1940.962632] BTRFS info (device sda): first mount of filesystem 834b4b= fd-fbd4-40b9-8868-d1187c3c5a63 > [ 1940.962665] BTRFS info (device sda): using crc32c (crc32c-intel) chec= ksum algorithm > [ 1940.962686] BTRFS warning (device sda): 'recovery' is deprecated, use= 'rescue=3Dusebackuproot' instead > [ 1940.962692] BTRFS info (device sda): trying to use backup root at mou= nt time > [ 1940.962698] BTRFS info (device sda): disk space caching is enabled > [ 1942.115796] BTRFS critical (device sda): corrupt leaf: root=3D2 block= =3D11438351450112 slot=3D170, invalid key objectid, have 5822947745796 exp= ect to be aligned to 4096 Bad extent item start bytenr, 5822947745796 =3D 0x54bc2bb6004, the last 0x004 looks like a bitflip. Please run memtest to make sure your hardware memory is fine, or such problem would just happen again and again. Thankfully extent tree corruption is not a big deal for "rescue=3Dall,ro" mount. Thanks, Qu > [ 1942.115819] BTRFS error (device sda): read time tree block corruption= detected on logical 11438351450112 mirror 2 > [ 1942.116170] BTRFS critical (device sda): corrupt leaf: root=3D2 block= =3D11438351450112 slot=3D170, invalid key objectid, have 5822947745796 exp= ect to be aligned to 4096 > [ 1942.116183] BTRFS error (device sda): read time tree block corruption= detected on logical 11438351450112 mirror 1 > [ 1942.116212] BTRFS error (device sda): failed to read block groups: -5 > [ 1942.140369] BTRFS error (device sda): open_ctree failed > > I tried to recover the superblock: > > # btrfs rescue super-recover -v /dev/sda > > All Devices: > Device: id =3D 3, name =3D /dev/sdc > Device: id =3D 2, name =3D /dev/sdb > Device: id =3D 4, name =3D /dev/sdd > Device: id =3D 1, name =3D /dev/sda > > Before Recovering: > [All good supers]: > device name =3D /dev/sdc > superblock bytenr =3D 65536 > > device name =3D /dev/sdc > superblock bytenr =3D 67108864 > > device name =3D /dev/sdc > superblock bytenr =3D 274877906944 > > device name =3D /dev/sdb > superblock bytenr =3D 65536 > > device name =3D /dev/sdb > superblock bytenr =3D 67108864 > > device name =3D /dev/sdb > superblock bytenr =3D 274877906944 > > device name =3D /dev/sdd > superblock bytenr =3D 65536 > > device name =3D /dev/sdd > superblock bytenr =3D 67108864 > > device name =3D /dev/sdd > superblock bytenr =3D 274877906944 > > device name =3D /dev/sda > superblock bytenr =3D 65536 > > device name =3D /dev/sda > superblock bytenr =3D 67108864 > > device name =3D /dev/sda > superblock bytenr =3D 274877906944 > > [All bad supers]: > > All supers are valid, no need to recover > > I checked the filesystem: > > # btrfs check --readonly /dev/sda > Opening filesystem to check... > corrupt leaf: root=3D2 block=3D62421692628992 slot=3D7, bad key order, p= rev (7275590123520 168 11227136) current (7258421481472 168 10948608) > corrupt leaf: root=3D2 block=3D62421692628992 slot=3D7, bad key order, p= rev (7275590123520 168 11227136) current (7258421481472 168 10948608) > corrupt leaf: root=3D2 block=3D62421692628992 slot=3D7, bad key order, p= rev (7275590123520 168 11227136) current (7258421481472 168 10948608) > corrupt leaf: root=3D2 block=3D62421692628992 slot=3D7, bad key order, p= rev (7275590123520 168 11227136) current (7258421481472 168 10948608) > ERROR: failed to read block groups: Operation not permitted > ERROR: cannot open file system > >