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Tue, 28 May 2024 07:40:09 +0200 Message-ID: <18218ba3-08a0-49c8-b83c-cfa9483cf746@gmx.com> Date: Tue, 28 May 2024 15:10:05 +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: btrfs check --repair - hangs in infinite loop To: wojtasjd , linux-btrfs@vger.kernel.org References: Content-Language: en-US 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: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:5XB5fAwv4E1fvjDKSuRTitVoIV99Y1wLDxPJVD1NXNeCbr0Xus/ BSvCH/1M7VIyPWjFUBUh+n09GV2oyc7LgFeH5+349fb/H5tPi7NAxyW64mNR/e1xGerxAk8 K+HR2IUSzc1MFER5QFfzRNKaAlYW6SJXq2JusDfWK0+FowVlOvH9HPL6pN3nFdrFzgcYehO auAw8p6+MobYEDsP+w+Bg== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:vNBSGVqzScs=;ra8Hy0hfUYrGcRKb1j08VMwpsZE kN+ihoiy7L0edr/2o+btX2m2CAlm13ixLmYYAbP1UY1igcOYECcmbLcFsQwQGkKr9WJcihWFS meRGqWbZGs4GrvswPBouo1itvv+bLDA7Odx/Df+Ixm/yjMZJk+S80t6Rr38dCMpYvBejIF1/m RrGjwpwrIpJvuXEfIxTsFE0g2Gf/zLMzZ6EQZhOgHxVAK0EEeco7cKvsGmHahCIxoPfwv68Cs xmHaCNEXo7fuG27/q85LbYHsjs1+WucfrJr2e0SV4vQ+gO2e3mildPnpgdgmk/xO54n8BDCki /JTpzEgLS/2yfxXFKXfeo55ubb2iqRWOGWACg+ZebOZfiarngf6yw16JlLJ3n/hfPjDRbnvw6 iU24j7pSw7XUXEONavmbcnPsJTPq2+eMZRCA1yxgP9OWgGD/HW+do8Ul/XPHxAVIk84Xv6zgj h3rQey8dBUvkmMffVb3K5VM4YeD+zvlRhxCQoD17HQCAZSGSTu6iTpAO5Ivc4hpcVkKMblnxU eDWQ9SrkSek/HgwXzI5iIKcBPDyCYg51RjLddlUBD6+YIQLUjSqt2jPEDEcBCb8fspJFzBSYP hvOP80ymWgHxbi6lk9e0ccfz1mj2/D4PtBViP0uKZVB2tiRlskkJv8+5rciFbHFMqDS/FMAgh x3cqfCZs+hMgc0bwUGma93HUVJLCJLFRHBTFTv26dA6EHseO23AWTxb8908bSPiYuyIZi4L7U ZPjbD7KwJWikCEI1bX+tJBGOTOlqihn9ihuYJxyHzew5mlfr8Vq4el/6g1M1S3Noamq0WM/xe A9Eq7QXeYL+oNoDkrygPAOz1QKWCi1fEhaISvy4mfLGvE= =E5=9C=A8 2024/5/28 11:12, wojtasjd =E5=86=99=E9=81=93: > I have damaged btrfs file system (root partition for GNU/Linux LMDE 4 > with 4.19.x kernel which boots and mounts "/" read only, some files with > 0 size, damaged timestamps and cannot be deleted because of I/O error). > > "btrfs check ..." (provided with LMDE 4) crashes with SegFault so I've > booted to LMDE 6 live session and did some checks: > > root@mint:~# uname -a > Linux mint 6.1.0-12-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.52-1 > (2023-09-07) x86_64 GNU/Linux > > root@mint:~# btrfs --version > btrfs-progs v6.2 > > root@mint:~# mount /dev/sdb2 /mnt > > root@mint:~# btrfs fi show > Label: none=C2=A0 uuid: 3a40ba85-56c2-4d26-a126-70839983f4a2 > =C2=A0=C2=A0=C2=A0 Total devices 1 FS bytes used 9.05GiB > =C2=A0=C2=A0=C2=A0 devid=C2=A0=C2=A0=C2=A0 1 size 15.02GiB used 12.57Gi= B path /dev/sdb2 > > root@mint:~# btrfs fi df /mnt > Data, single: total=3D10.01GiB, used=3D8.62GiB > System, DUP: total=3D32.00MiB, used=3D16.00KiB > Metadata, DUP: total=3D1.25GiB, used=3D434.23MiB > GlobalReserve, single: total=3D512.00MiB, used=3D0.00B > > root@mint:~# dmesg | tail -n 7 > [=C2=A0 404.266242] BTRFS info (device sdb2): using crc32c (crc32c-intel= ) > checksum algorithm > [=C2=A0 404.266264] BTRFS info (device sdb2): disk space caching is enab= led > [=C2=A0 404.558136] BTRFS critical (device sdb2): corrupt leaf: root=3D5 > block=3D29589504 slot=3D30 ino=3D1378764, invalid mode: has 00 expect va= lid > S_IF* bit(s) > [=C2=A0 404.558157] BTRFS error (device sdb2): read time tree block > corruption detected on logical 29589504 mirror 1 > [=C2=A0 404.565225] BTRFS critical (device sdb2): corrupt leaf: root=3D5 > block=3D29589504 slot=3D30 ino=3D1378764, invalid mode: has 00 expect va= lid > S_IF* bit(s) > [=C2=A0 404.565244] BTRFS error (device sdb2): read time tree block > corruption detected on logical 29589504 mirror 2 > [=C2=A0 404.565328] BTRFS error (device sdb2): could not do orphan clean= up -5 > root@mint:~# > > root@mint:~# btrfs inspect-internal logical-resolve 29589504 /mnt > ERROR: logical ino ioctl: No such file or directory > > root@mint:~# umount /mnt > root@mint:~# btrfs check --repair /dev/sdb2 > enabling repair mode > WARNING: > > =C2=A0=C2=A0=C2=A0 Do not use --repair unless you are advised to do so = by a developer > =C2=A0=C2=A0=C2=A0 or an experienced user, and then only after having a= ccepted that no > =C2=A0=C2=A0=C2=A0 fsck can successfully repair all types of filesystem= corruption. Eg. > =C2=A0=C2=A0=C2=A0 some software or hardware bugs can fatally damage a = volume. > =C2=A0=C2=A0=C2=A0 The operation will start in 10 seconds. > =C2=A0=C2=A0=C2=A0 Use Ctrl-C to stop it. > 10 9 8 7 6 5 4 3 2 1 > Starting repair. > Opening filesystem to check... > Checking filesystem on /dev/sdb2 > UUID: 3a40ba85-56c2-4d26-a126-70839983f4a2 > [1/7] checking root items > Fixed 0 roots. > [2/7] checking extents > corrupt leaf: root=3D5 block=3D29589504 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 Please do not do the --repair unless you really know what you're doing. At least you should run "btrfs check --readonly" and share it to the ML before doing it. > corrupt leaf: root=3D5 block=3D29589504 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 This shows exactly what's going wrong, your hardware memory. hex(4294979450) =3D 0x100002f7a hex(12154) =3D 0x000002f7a One bit flipped inside the item size, causing the problem. Btrfs-check can not handle such case well, as it doesn't expect such insanely wrong values. I won't risk --repair as such corruption can be very dangerous especially you have already run repair once. Thanks, Qu > corrupt leaf: root=3D5 block=3D29589504 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D29589504 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D32129024 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D29540352 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D32129024 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D29540352 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D32129024 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D29540352 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D32129024 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D29540352 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D32129024 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D29540352 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D32129024 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D29540352 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > corrupt leaf: root=3D5 block=3D32129024 slot=3D31, unexpected item end, = have > 4294979450 expect 12154 > ^C > root@mint:~# > > btrfs in repair mode hangs in infinite loop and spits out info about > corrupt leaf and two blocks like you can see above. > > I have image of disk. > > Can I repair this somehow? > >