* Root level mismatch after sudden shutdown
@ 2022-02-09 10:53 BERGUE Kevin
2022-02-09 21:03 ` Chris Murphy
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: BERGUE Kevin @ 2022-02-09 10:53 UTC (permalink / raw)
To: linux-btrfs
Hello everyone.
After a sudden shutdown my btrfs partition seems to be corrupted. After a few hours of reading documentation and trying various repair methods I found an error message I can't find anywhere so I'm sending it your way hoping you can at least explain what the issue is. The disk was running with linux 5.16.5 at the moment of the crash, my recovery environnement is a linux 5.15.16 machine with btrfs-progs v5.16.
To retrace my steps a bit:
- I tried to mount my partition normally:
# mount /dev/mapper/SSD-Root /mnt/broken/
mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
- I then looked at the relevant logs from dmesg:
# dmesg
[ 2118.381387] BTRFS info (device dm-1): flagging fs with big metadata feature
[ 2118.381394] BTRFS info (device dm-1): disk space caching is enabled
[ 2118.381395] BTRFS info (device dm-1): has skinny extents
[ 2118.384626] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
[ 2118.384900] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
[ 2118.384905] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
[ 2118.385304] BTRFS error (device dm-1): open_ctree failed
- After some reading about the "parent transid verify failed" errors I tried to mount the volume with the usebackuproot flag:
# mount -t btrfs -o ro,rescue=usebackuproot /dev/mapper/SSD-Root /mnt/broken/
mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
And the dmesg content:
[ 2442.117867] BTRFS info (device dm-1): flagging fs with big metadata feature
[ 2442.117871] BTRFS info (device dm-1): trying to use backup root at mount time
[ 2442.117872] BTRFS info (device dm-1): disk space caching is enabled
[ 2442.117873] BTRFS info (device dm-1): has skinny extents
[ 2442.123056] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
[ 2442.123344] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
[ 2442.123348] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
[ 2442.124743] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
[ 2442.124939] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
[ 2442.124942] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
[ 2442.125196] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
[ 2442.125201] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
[ 2442.125500] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
[ 2442.125502] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
[ 2442.125508] BTRFS warning (device dm-1): couldn't read tree root
[ 2442.125806] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
[ 2442.125808] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
[ 2442.126174] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
[ 2442.126175] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
[ 2442.126184] BTRFS warning (device dm-1): couldn't read tree root
[ 2442.126599] BTRFS error (device dm-1): open_ctree failed
- I then tried a check:
# btrfs check /dev/mapper/SSD-Root
Opening filesystem to check...
parent transid verify failed on 1869491683328 wanted 526959 found 526999
parent transid verify failed on 1869491683328 wanted 526959 found 526999
parent transid verify failed on 1869491683328 wanted 526959 found 526999
Ignoring transid failure
ERROR: root [4 0] level 0 does not match 1
Couldn't setup device tree
ERROR: cannot open file system
I think the "root [4 0] level 0 does not match 1" error is the real cuprit but I can't seem to find any info on this message anywhere. I tried a bunch of other commands including:
- btrfs rescue zero-log
- btrfs rescue chunk-recover
- btrfs check --repair
- btrfs rescue super-recover
- btrfs check --repair with the tree root found by btrfs-find-root
- btrfs check --repair --init-csum-tree --init-extent-tree
- btrfs restore
I'm aware I probably executed some commands that don't make a lot of sense in my context but all of them failed with either the "root [4 0] level 0 does not match 1" message or a more generic "could not open ctree" or equivalent.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Root level mismatch after sudden shutdown
2022-02-09 10:53 Root level mismatch after sudden shutdown BERGUE Kevin
@ 2022-02-09 21:03 ` Chris Murphy
2022-02-10 8:44 ` BERGUE Kevin
2022-02-10 1:33 ` Qu Wenruo
2022-02-16 7:54 ` Zygo Blaxell
2 siblings, 1 reply; 7+ messages in thread
From: Chris Murphy @ 2022-02-09 21:03 UTC (permalink / raw)
To: BERGUE Kevin; +Cc: linux-btrfs, Qu Wenruo
On Wed, Feb 9, 2022 at 5:10 AM BERGUE Kevin
<kevin.bergue-externe@hemeria-group.com> wrote:
>
> Hello everyone.
>
>
> After a sudden shutdown my btrfs partition seems to be corrupted. After a few hours of reading documentation and trying various repair methods I found an error message I can't find anywhere so I'm sending it your way hoping you can at least explain what the issue is. The disk was running with linux 5.16.5 at the moment of the crash, my recovery environnement is a linux 5.15.16 machine with btrfs-progs v5.16.
>
>
> To retrace my steps a bit:
>
> - I tried to mount my partition normally:
> # mount /dev/mapper/SSD-Root /mnt/broken/
> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
>
> - I then looked at the relevant logs from dmesg:
> # dmesg
> [ 2118.381387] BTRFS info (device dm-1): flagging fs with big metadata feature
> [ 2118.381394] BTRFS info (device dm-1): disk space caching is enabled
> [ 2118.381395] BTRFS info (device dm-1): has skinny extents
> [ 2118.384626] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2118.384900] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2118.384905] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
> [ 2118.385304] BTRFS error (device dm-1): open_ctree failed
>
> - After some reading about the "parent transid verify failed" errors I tried to mount the volume with the usebackuproot flag:
> # mount -t btrfs -o ro,rescue=usebackuproot /dev/mapper/SSD-Root /mnt/broken/
> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
> And the dmesg content:
> [ 2442.117867] BTRFS info (device dm-1): flagging fs with big metadata feature
> [ 2442.117871] BTRFS info (device dm-1): trying to use backup root at mount time
> [ 2442.117872] BTRFS info (device dm-1): disk space caching is enabled
> [ 2442.117873] BTRFS info (device dm-1): has skinny extents
> [ 2442.123056] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.123344] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.123348] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
> [ 2442.124743] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.124939] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.124942] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
> [ 2442.125196] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
> [ 2442.125201] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
> [ 2442.125500] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
> [ 2442.125502] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
> [ 2442.125508] BTRFS warning (device dm-1): couldn't read tree root
> [ 2442.125806] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
> [ 2442.125808] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
> [ 2442.126174] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
> [ 2442.126175] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
> [ 2442.126184] BTRFS warning (device dm-1): couldn't read tree root
> [ 2442.126599] BTRFS error (device dm-1): open_ctree failed
What do you get for uname -a? What are the mount options? In
particular I'm wondering if this drive is subject to discards, which
currently will render usebackuproots useless. And how old is the file
system?
If ro,rescue=usebackuproot doesn't work, it's not likely repairable,
but might still be something btrfs restore can scrape *if* you haven't
tried any repairs first. Repairs write changes to disk and can make
things worse and harder to recover. You pretty much have to go
straight to the scrape data off the drive step before the repair step
because it is lower risk and more reliable.
The central problem is some lower layer mishandled write order, most
likely by dropping flush/FUA, i.e. confirming to btrfs that flush/FUA
command succeeded when in fact critical metadata has not yet made it
to persistent media. And there is no way for Btrfs to know this until
it's too late.
>
> - I then tried a check:
> # btrfs check /dev/mapper/SSD-Root
> Opening filesystem to check...
> parent transid verify failed on 1869491683328 wanted 526959 found 526999
> parent transid verify failed on 1869491683328 wanted 526959 found 526999
> parent transid verify failed on 1869491683328 wanted 526959 found 526999
> Ignoring transid failure
> ERROR: root [4 0] level 0 does not match 1
What do you get for
btrfs rescue super -v $dev
btrfs insp dump-s -f $dev
btrfs insp dump-t -b 1869491683328 $dev
btrfs insp dump-t -b 1869863370752 $dev
btrfs insp dump-t -b 1869866401792 $dev
>
> Couldn't setup device tree
> ERROR: cannot open file system
>
>
> I think the "root [4 0] level 0 does not match 1" error is the real cuprit but I can't seem to find any info on this message anywhere. I tried a bunch of other commands including:
> - btrfs rescue zero-log
> - btrfs rescue chunk-recover
> - btrfs check --repair
> - btrfs rescue super-recover
> - btrfs check --repair with the tree root found by btrfs-find-root
> - btrfs check --repair --init-csum-tree --init-extent-tree
> - btrfs restore
>
> I'm aware I probably executed some commands that don't make a lot of sense in my context but all of them failed with either the "root [4 0] level 0 does not match 1" message or a more generic "could not open ctree" or equivalent.
--repair, but especially --init-extent-tree can make it next to
impossible for 'btrfs restore' command to work. It's not obvious that
trying to fix btrfs, can make it harder for the scrape tool to work.
--
Chris Murphy
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Root level mismatch after sudden shutdown
2022-02-09 10:53 Root level mismatch after sudden shutdown BERGUE Kevin
2022-02-09 21:03 ` Chris Murphy
@ 2022-02-10 1:33 ` Qu Wenruo
2022-02-10 8:48 ` BERGUE Kevin
2022-02-16 7:54 ` Zygo Blaxell
2 siblings, 1 reply; 7+ messages in thread
From: Qu Wenruo @ 2022-02-10 1:33 UTC (permalink / raw)
To: BERGUE Kevin, linux-btrfs
On 2022/2/9 18:53, BERGUE Kevin wrote:
> Hello everyone.
>
>
> After a sudden shutdown my btrfs partition seems to be corrupted. After a few hours of reading documentation and trying various repair methods I found an error message I can't find anywhere so I'm sending it your way hoping you can at least explain what the issue is. The disk was running with linux 5.16.5 at the moment of the crash, my recovery environnement is a linux 5.15.16 machine with btrfs-progs v5.16.
>
>
> To retrace my steps a bit:
>
> - I tried to mount my partition normally:
> # mount /dev/mapper/SSD-Root /mnt/broken/
> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
>
> - I then looked at the relevant logs from dmesg:
> # dmesg
> [ 2118.381387] BTRFS info (device dm-1): flagging fs with big metadata feature
> [ 2118.381394] BTRFS info (device dm-1): disk space caching is enabled
> [ 2118.381395] BTRFS info (device dm-1): has skinny extents
> [ 2118.384626] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2118.384900] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
Transid mismatch, and it's newer tree blocks overwriting old tree blocks.
This means two possible situations:
- The SSD is lying about its flush/fua opeartions
This means, the SSD firmware doesn't really write all its data back to
its NAND when it reports flush/fua operations are finished.
This mostly means the SSD is not reliable for any filesystems.
Although traditional journal based filesystems may have a better
chance to survive.
- Some corrupted v1 cache makes btrfs to break its CoW checks
This can only happen for v1 space cache, and is pretty tricky to
happen, as v1 cache has its own checksum.
And now v2 cache is the default for newly created btrfs.
- Corrupted extent tree screwing up metadata CoW
Normally it would cause transaction abort in the first place though.
- Complex storage stack added extra points to cause FLUSH/FUA problem
If you're using things like LVM/LUKS/Bcache, it's more complex and
any stack in the middle can cause FLUSH/FUA problem if there is some
bugs.
Mind to share the following info?
- Storage stack
From hardware disk to the top level btrfs, all things like LVM/LUKS
/Bcache would help us to understand the situation.
- SSD model
To see if it's some known one to have FLUSH/FUA problems.
Thanks,
Qu
> [ 2118.384905] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
> [ 2118.385304] BTRFS error (device dm-1): open_ctree failed
>
> - After some reading about the "parent transid verify failed" errors I tried to mount the volume with the usebackuproot flag:
> # mount -t btrfs -o ro,rescue=usebackuproot /dev/mapper/SSD-Root /mnt/broken/
> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
> And the dmesg content:
> [ 2442.117867] BTRFS info (device dm-1): flagging fs with big metadata feature
> [ 2442.117871] BTRFS info (device dm-1): trying to use backup root at mount time
> [ 2442.117872] BTRFS info (device dm-1): disk space caching is enabled
> [ 2442.117873] BTRFS info (device dm-1): has skinny extents
> [ 2442.123056] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.123344] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.123348] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
> [ 2442.124743] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.124939] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.124942] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
> [ 2442.125196] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
> [ 2442.125201] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
> [ 2442.125500] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
> [ 2442.125502] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
> [ 2442.125508] BTRFS warning (device dm-1): couldn't read tree root
> [ 2442.125806] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
> [ 2442.125808] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
> [ 2442.126174] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
> [ 2442.126175] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
> [ 2442.126184] BTRFS warning (device dm-1): couldn't read tree root
> [ 2442.126599] BTRFS error (device dm-1): open_ctree failed
>
> - I then tried a check:
> # btrfs check /dev/mapper/SSD-Root
> Opening filesystem to check...
> parent transid verify failed on 1869491683328 wanted 526959 found 526999
> parent transid verify failed on 1869491683328 wanted 526959 found 526999
> parent transid verify failed on 1869491683328 wanted 526959 found 526999
> Ignoring transid failure
> ERROR: root [4 0] level 0 does not match 1
>
> Couldn't setup device tree
> ERROR: cannot open file system
>
>
> I think the "root [4 0] level 0 does not match 1" error is the real cuprit but I can't seem to find any info on this message anywhere. I tried a bunch of other commands including:
> - btrfs rescue zero-log
> - btrfs rescue chunk-recover
> - btrfs check --repair
> - btrfs rescue super-recover
> - btrfs check --repair with the tree root found by btrfs-find-root
> - btrfs check --repair --init-csum-tree --init-extent-tree
> - btrfs restore
>
> I'm aware I probably executed some commands that don't make a lot of sense in my context but all of them failed with either the "root [4 0] level 0 does not match 1" message or a more generic "could not open ctree" or equivalent.
^ permalink raw reply [flat|nested] 7+ messages in thread
* RE: Root level mismatch after sudden shutdown
2022-02-09 21:03 ` Chris Murphy
@ 2022-02-10 8:44 ` BERGUE Kevin
0 siblings, 0 replies; 7+ messages in thread
From: BERGUE Kevin @ 2022-02-10 8:44 UTC (permalink / raw)
To: Chris Murphy; +Cc: linux-btrfs, Qu Wenruo
[-- Attachment #1: Type: text/plain, Size: 7725 bytes --]
>> Hello everyone.
>>
>>
>> After a sudden shutdown my btrfs partition seems to be corrupted. After a few hours of reading documentation and trying various repair methods I found an error message I can't find anywhere so I'm sending it your way hoping you can at least explain what the issue is. The disk was running with linux 5.16.5 at the moment of the crash, my recovery environnement is a linux 5.15.16 machine with btrfs-progs v5.16.
>>
>>
>> To retrace my steps a bit:
>>
>> - I tried to mount my partition normally:
>> # mount /dev/mapper/SSD-Root /mnt/broken/
>> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
>>
>> - I then looked at the relevant logs from dmesg:
>> # dmesg
>> [ 2118.381387] BTRFS info (device dm-1): flagging fs with big metadata feature
>> [ 2118.381394] BTRFS info (device dm-1): disk space caching is enabled
>> [ 2118.381395] BTRFS info (device dm-1): has skinny extents
>> [ 2118.384626] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2118.384900] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2118.384905] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
>> [ 2118.385304] BTRFS error (device dm-1): open_ctree failed
>>
>> - After some reading about the "parent transid verify failed" errors I tried to mount the volume with the usebackuproot flag:
>> # mount -t btrfs -o ro,rescue=usebackuproot /dev/mapper/SSD-Root /mnt/broken/
>> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
>> And the dmesg content:
>> [ 2442.117867] BTRFS info (device dm-1): flagging fs with big metadata feature
>> [ 2442.117871] BTRFS info (device dm-1): trying to use backup root at mount time
>> [ 2442.117872] BTRFS info (device dm-1): disk space caching is enabled
>> [ 2442.117873] BTRFS info (device dm-1): has skinny extents
>> [ 2442.123056] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.123344] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.123348] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
>> [ 2442.124743] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.124939] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.124942] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
>> [ 2442.125196] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
>> [ 2442.125201] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
>> [ 2442.125500] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
>> [ 2442.125502] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
>> [ 2442.125508] BTRFS warning (device dm-1): couldn't read tree root
>> [ 2442.125806] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
>> [ 2442.125808] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
>> [ 2442.126174] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
>> [ 2442.126175] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
>> [ 2442.126184] BTRFS warning (device dm-1): couldn't read tree root
>> [ 2442.126599] BTRFS error (device dm-1): open_ctree failed
>
>What do you get for uname -a? What are the mount options? In
>particular I'm wondering if this drive is subject to discards, which
>currently will render usebackuproots useless. And how old is the file
>system?
$ uname -a
Linux Elysium 5.16.5-1-MANJARO #1 SMP PREEMPT Tue Feb 1 16:57:14 UTC 2022 x86_64 GNU/Linux
The mount options I used were probably "rw,noatime,compress=zstd,ssd,space_cache,commit=120,subvol=@" since that's what I usually use but I can't be sure since fstab is on the disk.
Again, can't know for sure but from the top of my head I'd say I created it 6 months ago? It was probably created with linux 5.10 since that would have been the latest LTS.
>
>If ro,rescue=usebackuproot doesn't work, it's not likely repairable,
>but might still be something btrfs restore can scrape *if* you haven't
>tried any repairs first. Repairs write changes to disk and can make
>things worse and harder to recover. You pretty much have to go
>straight to the scrape data off the drive step before the repair step
>because it is lower risk and more reliable.
>
>The central problem is some lower layer mishandled write order, most
>likely by dropping flush/FUA, i.e. confirming to btrfs that flush/FUA
>command succeeded when in fact critical metadata has not yet made it
>to persistent media. And there is no way for Btrfs to know this until
>it's too late.
Yeah, that was my guess too.
>>
>> - I then tried a check:
>> # btrfs check /dev/mapper/SSD-Root
>> Opening filesystem to check...
>> parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> Ignoring transid failure
>> ERROR: root [4 0] level 0 does not match 1
>
>What do you get for
>
>btrfs rescue super -v $dev
All Devices:
Device: id = 1, name = /dev/mapper/SSD-Root
Before Recovering:
[All good supers]:
device name = /dev/mapper/SSD-Root
superblock bytenr = 65536
device name = /dev/mapper/SSD-Root
superblock bytenr = 67108864
device name = /dev/mapper/SSD-Root
superblock bytenr = 274877906944
[All bad supers]:
All supers are valid, no need to recover
>btrfs insp dump-s -f $dev
see attached "dump-s" file
>btrfs insp dump-t -b 1869491683328 $dev
see attached "dump-t -b 1869491683328" file
>btrfs insp dump-t -b 1869863370752 $dev
see attached "dump-t -b 1869863370752" file
>btrfs insp dump-t -b 1869866401792 $dev
see attached "dump-t -b 1869866401792" file
>
>
>
>>
>> Couldn't setup device tree
>> ERROR: cannot open file system
>>
>>
>> I think the "root [4 0] level 0 does not match 1" error is the real cuprit but I can't seem to find any info on this message anywhere. I tried a bunch of other commands including:
>> - btrfs rescue zero-log
>> - btrfs rescue chunk-recover
>> - btrfs check --repair
>> - btrfs rescue super-recover
>> - btrfs check --repair with the tree root found by btrfs-find-root
>> - btrfs check --repair --init-csum-tree --init-extent-tree
>> - btrfs restore
>>
>> I'm aware I probably executed some commands that don't make a lot of sense in my context but all of them failed with either the "root [4 0] level 0 does not match 1" message or a more generic "could not open ctree" or equivalent.
>
>--repair, but especially --init-extent-tree can make it next to
>impossible for 'btrfs restore' command to work. It's not obvious that
>trying to fix btrfs, can make it harder for the scrape tool to work.
>
>
>
>--
>Chris Murphy
[-- Attachment #2: dump-t -b 1869866401792 --]
[-- Type: application/octet-stream, Size: 37875 bytes --]
btrfs-progs v5.16
parent transid verify failed on 1869491683328 wanted 526959 found 526999
parent transid verify failed on 1869491683328 wanted 526959 found 526999
Couldn't setup device tree
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[-- Attachment #3: dump-t -b 1869863370752 --]
[-- Type: application/octet-stream, Size: 34716 bytes --]
btrfs-progs v5.16
parent transid verify failed on 1869491683328 wanted 526959 found 526999
parent transid verify failed on 1869491683328 wanted 526959 found 526999
Couldn't setup device tree
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[-- Attachment #4: dump-t -b 1869491683328 --]
[-- Type: application/octet-stream, Size: 37812 bytes --]
btrfs-progs v5.16
parent transid verify failed on 1869491683328 wanted 526959 found 526999
parent transid verify failed on 1869491683328 wanted 526959 found 526999
Couldn't setup device tree
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[-- Attachment #5: dump-s --]
[-- Type: application/octet-stream, Size: 3422 bytes --]
superblock: bytenr=65536, device=/dev/mapper/SSD-Root
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0x11012b42 [match]
bytenr 65536
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid f3801f99-7d52-40d1-942a-21694a73d70a
metadata_uuid f3801f99-7d52-40d1-942a-21694a73d70a
label
generation 527003
root 1869867565056
sys_array_size 129
chunk_root_generation 508001
root_level 1
chunk_root 1871629516800
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 942489468928
bytes_used 773380874240
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x151
( MIXED_BACKREF |
COMPRESS_ZSTD |
EXTENDED_IREF |
SKINNY_METADATA )
cache_generation 527003
uuid_tree_generation 527003
dev_item.uuid 5b27a79a-569e-4aa8-bfde-2a66c4485d0c
dev_item.fsid f3801f99-7d52-40d1-942a-21694a73d70a [match]
dev_item.type 0
dev_item.total_bytes 942489468928
dev_item.bytes_used 831143280640
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 1
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
sys_chunk_array[2048]:
item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 1871629516800)
length 33554432 owner 2 stripe_len 65536 type SYSTEM|DUP
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 1
stripe 0 devid 1 offset 82746277888
dev_uuid 5b27a79a-569e-4aa8-bfde-2a66c4485d0c
stripe 1 devid 1 offset 82779832320
dev_uuid 5b27a79a-569e-4aa8-bfde-2a66c4485d0c
backup_roots[4]:
backup 0:
backup_tree_root: 1869866401792 gen: 527001 level: 1
backup_chunk_root: 1871629516800 gen: 508001 level: 1
backup_extent_root: 1869862551552 gen: 527001 level: 2
backup_fs_root: 1869625753600 gen: 526974 level: 1
backup_dev_root: 1869491683328 gen: 526959 level: 1
backup_csum_root: 1869859930112 gen: 527001 level: 2
backup_total_bytes: 942489468928
backup_bytes_used: 773380874240
backup_num_devices: 1
backup 1:
backup_tree_root: 1869863813120 gen: 527002 level: 1
backup_chunk_root: 1871629516800 gen: 508001 level: 1
backup_extent_root: 1869863124992 gen: 527002 level: 2
backup_fs_root: 1869625753600 gen: 526974 level: 1
backup_dev_root: 1869491683328 gen: 526959 level: 1
backup_csum_root: 1869861617664 gen: 527002 level: 2
backup_total_bytes: 942489468928
backup_bytes_used: 773380874240
backup_num_devices: 1
backup 2:
backup_tree_root: 1869867565056 gen: 527003 level: 1
backup_chunk_root: 1871629516800 gen: 508001 level: 1
backup_extent_root: 1869865238528 gen: 527003 level: 2
backup_fs_root: 1869625753600 gen: 526974 level: 1
backup_dev_root: 1869491683328 gen: 526959 level: 1
backup_csum_root: 1869861994496 gen: 527003 level: 2
backup_total_bytes: 942489468928
backup_bytes_used: 773380874240
backup_num_devices: 1
backup 3:
backup_tree_root: 1869863370752 gen: 527000 level: 1
backup_chunk_root: 1871629516800 gen: 508001 level: 1
backup_extent_root: 1869862027264 gen: 527000 level: 2
backup_fs_root: 1869625753600 gen: 526974 level: 1
backup_dev_root: 1869491683328 gen: 526959 level: 1
backup_csum_root: 1869854654464 gen: 527000 level: 2
backup_total_bytes: 942489468928
backup_bytes_used: 773380874240
backup_num_devices: 1
^ permalink raw reply [flat|nested] 7+ messages in thread
* RE: Root level mismatch after sudden shutdown
2022-02-10 1:33 ` Qu Wenruo
@ 2022-02-10 8:48 ` BERGUE Kevin
2022-02-10 23:20 ` Chris Murphy
0 siblings, 1 reply; 7+ messages in thread
From: BERGUE Kevin @ 2022-02-10 8:48 UTC (permalink / raw)
To: Qu Wenruo, linux-btrfs
>> Hello everyone.
>>
>>
>> After a sudden shutdown my btrfs partition seems to be corrupted. After a few hours of reading documentation and trying various repair methods I found an error message I can't find anywhere so I'm sending it your way hoping you can at least explain what the issue is. The disk was running with linux 5.16.5 at the moment of the crash, my recovery environnement is a linux 5.15.16 machine with btrfs-progs v5.16.
>>
>>
>> To retrace my steps a bit:
>>
>> - I tried to mount my partition normally:
>> # mount /dev/mapper/SSD-Root /mnt/broken/
>> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
>>
>> - I then looked at the relevant logs from dmesg:
>> # dmesg
>> [ 2118.381387] BTRFS info (device dm-1): flagging fs with big metadata feature
>> [ 2118.381394] BTRFS info (device dm-1): disk space caching is enabled
>> [ 2118.381395] BTRFS info (device dm-1): has skinny extents
>> [ 2118.384626] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2118.384900] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>
>Transid mismatch, and it's newer tree blocks overwriting old tree blocks.
>
>This means two possible situations:
>
>- The SSD is lying about its flush/fua opeartions
> This means, the SSD firmware doesn't really write all its data back to
> its NAND when it reports flush/fua operations are finished.
> This mostly means the SSD is not reliable for any filesystems.
>
> Although traditional journal based filesystems may have a better
> chance to survive.
>
>- Some corrupted v1 cache makes btrfs to break its CoW checks
> This can only happen for v1 space cache, and is pretty tricky to
> happen, as v1 cache has its own checksum.
>
> And now v2 cache is the default for newly created btrfs.
>
>- Corrupted extent tree screwing up metadata CoW
> Normally it would cause transaction abort in the first place though.
>
>- Complex storage stack added extra points to cause FLUSH/FUA problem
> If you're using things like LVM/LUKS/Bcache, it's more complex and
> any stack in the middle can cause FLUSH/FUA problem if there is some
> bugs.
>
>Mind to share the following info?
>
>- Storage stack
> From hardware disk to the top level btrfs, all things like LVM/LUKS
> /Bcache would help us to understand the situation.
The btrfs volume is on a LVM lv which itself is on a single SATA ssd. According to SMART the disk is healthy.
>
>- SSD model
> To see if it's some known one to have FLUSH/FUA problems.
The SSD reports itself as an INTEL SSDSC2KG960G8.
>
>Thanks,
>Qu
>
>
>> [ 2118.384905] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
>> [ 2118.385304] BTRFS error (device dm-1): open_ctree failed
>>
>> - After some reading about the "parent transid verify failed" errors I tried to mount the volume with the usebackuproot flag:
>> # mount -t btrfs -o ro,rescue=usebackuproot /dev/mapper/SSD-Root /mnt/broken/
>> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
>> And the dmesg content:
>> [ 2442.117867] BTRFS info (device dm-1): flagging fs with big metadata feature
>> [ 2442.117871] BTRFS info (device dm-1): trying to use backup root at mount time
>> [ 2442.117872] BTRFS info (device dm-1): disk space caching is enabled
>> [ 2442.117873] BTRFS info (device dm-1): has skinny extents
>> [ 2442.123056] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.123344] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.123348] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
>> [ 2442.124743] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.124939] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> [ 2442.124942] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
>> [ 2442.125196] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
>> [ 2442.125201] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
>> [ 2442.125500] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
>> [ 2442.125502] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
>> [ 2442.125508] BTRFS warning (device dm-1): couldn't read tree root
>> [ 2442.125806] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
>> [ 2442.125808] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
>> [ 2442.126174] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
>> [ 2442.126175] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
>> [ 2442.126184] BTRFS warning (device dm-1): couldn't read tree root
>> [ 2442.126599] BTRFS error (device dm-1): open_ctree failed
>>
>> - I then tried a check:
>> # btrfs check /dev/mapper/SSD-Root
>> Opening filesystem to check...
>> parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> parent transid verify failed on 1869491683328 wanted 526959 found 526999
>> Ignoring transid failure
>> ERROR: root [4 0] level 0 does not match 1
>>
>> Couldn't setup device tree
>> ERROR: cannot open file system
>>
>>
>> I think the "root [4 0] level 0 does not match 1" error is the real cuprit but I can't seem to find any info on this message anywhere. I tried a bunch of other commands including:
>> - btrfs rescue zero-log
>> - btrfs rescue chunk-recover
>> - btrfs check --repair
>> - btrfs rescue super-recover
>> - btrfs check --repair with the tree root found by btrfs-find-root
>> - btrfs check --repair --init-csum-tree --init-extent-tree
>> - btrfs restore
>>
>> I'm aware I probably executed some commands that don't make a lot of sense in my context but all of them failed with either the "root [4 0] level 0 does not match 1" message or a more generic "could not open ctree" or equivalent.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Root level mismatch after sudden shutdown
2022-02-10 8:48 ` BERGUE Kevin
@ 2022-02-10 23:20 ` Chris Murphy
0 siblings, 0 replies; 7+ messages in thread
From: Chris Murphy @ 2022-02-10 23:20 UTC (permalink / raw)
To: BERGUE Kevin; +Cc: Qu Wenruo, linux-btrfs
On Thu, Feb 10, 2022 at 1:48 AM BERGUE Kevin
<kevin.bergue-externe@hemeria-group.com> wrote:
>
> The SSD reports itself as an INTEL SSDSC2KG960G8.
Well, sample size of one, user with SSDSC2KW256G8 that has firmware
LHF002C reports it was fine until 200% write endurance. It's not a
known problem SSD anyway.
--
Chris Murphy
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Root level mismatch after sudden shutdown
2022-02-09 10:53 Root level mismatch after sudden shutdown BERGUE Kevin
2022-02-09 21:03 ` Chris Murphy
2022-02-10 1:33 ` Qu Wenruo
@ 2022-02-16 7:54 ` Zygo Blaxell
2 siblings, 0 replies; 7+ messages in thread
From: Zygo Blaxell @ 2022-02-16 7:54 UTC (permalink / raw)
To: BERGUE Kevin; +Cc: linux-btrfs
On Wed, Feb 09, 2022 at 10:53:32AM +0000, BERGUE Kevin wrote:
> Hello everyone.
>
>
> After a sudden shutdown my btrfs partition seems to be corrupted. After a few hours of reading documentation and trying various repair methods I found an error message I can't find anywhere so I'm sending it your way hoping you can at least explain what the issue is. The disk was running with linux 5.16.5 at the moment of the crash, my recovery environnement is a linux 5.15.16 machine with btrfs-progs v5.16.
>
>
> To retrace my steps a bit:
>
> - I tried to mount my partition normally:
> # mount /dev/mapper/SSD-Root /mnt/broken/
> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
>
> - I then looked at the relevant logs from dmesg:
> # dmesg
> [ 2118.381387] BTRFS info (device dm-1): flagging fs with big metadata feature
> [ 2118.381394] BTRFS info (device dm-1): disk space caching is enabled
> [ 2118.381395] BTRFS info (device dm-1): has skinny extents
> [ 2118.384626] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2118.384900] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2118.384905] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
> [ 2118.385304] BTRFS error (device dm-1): open_ctree failed
>
> - After some reading about the "parent transid verify failed" errors I tried to mount the volume with the usebackuproot flag:
> # mount -t btrfs -o ro,rescue=usebackuproot /dev/mapper/SSD-Root /mnt/broken/
> mount: /mnt/broken: wrong fs type, bad option, bad superblock on /dev/mapper/SSD-Root, missing codepage or helper program, or other error.
> And the dmesg content:
> [ 2442.117867] BTRFS info (device dm-1): flagging fs with big metadata feature
> [ 2442.117871] BTRFS info (device dm-1): trying to use backup root at mount time
> [ 2442.117872] BTRFS info (device dm-1): disk space caching is enabled
> [ 2442.117873] BTRFS info (device dm-1): has skinny extents
> [ 2442.123056] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.123344] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.123348] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
> [ 2442.124743] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.124939] BTRFS error (device dm-1): parent transid verify failed on 1869491683328 wanted 526959 found 526999
> [ 2442.124942] BTRFS warning (device dm-1): failed to read root (objectid=4): -5
> [ 2442.125196] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
> [ 2442.125201] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
> [ 2442.125500] BTRFS critical (device dm-1): corrupt leaf: block=1869863370752 slot=97 extent bytenr=920192651264 len=4096 invalid generation, have 527002 expect (0, 527001]
> [ 2442.125502] BTRFS error (device dm-1): block=1869863370752 read time tree block corruption detected
> [ 2442.125508] BTRFS warning (device dm-1): couldn't read tree root
> [ 2442.125806] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
> [ 2442.125808] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
> [ 2442.126174] BTRFS critical (device dm-1): corrupt leaf: block=1869866401792 slot=117 extent bytenr=906206486528 len=4096 invalid generation, have 527003 expect (0, 527002]
> [ 2442.126175] BTRFS error (device dm-1): block=1869866401792 read time tree block corruption detected
> [ 2442.126184] BTRFS warning (device dm-1): couldn't read tree root
> [ 2442.126599] BTRFS error (device dm-1): open_ctree failed
>
> - I then tried a check:
> # btrfs check /dev/mapper/SSD-Root
> Opening filesystem to check...
> parent transid verify failed on 1869491683328 wanted 526959 found 526999
> parent transid verify failed on 1869491683328 wanted 526959 found 526999
> parent transid verify failed on 1869491683328 wanted 526959 found 526999
> Ignoring transid failure
> ERROR: root [4 0] level 0 does not match 1
>
> Couldn't setup device tree
> ERROR: cannot open file system
>
>
> I think the "root [4 0] level 0 does not match 1" error is the real
> cuprit but I can't seem to find any info on this message anywhere.
The real culprit is the "parent transid verify failed" event. Everything
printed after the "Ignoring transid failure" message is nonsense and
should be ignored, which is probably why nobody writes about it.
So let's write about it...
btrfs check should not continue to process the page after a transid verify
failure--the probability of success is not exactly zero, but pretty close.
Any information btrfs check gets from the page will be wrong, and could
cause further corruption if it somehow got past all the other validation
checks.
Parent transid cannot be ignored with any useful effect. btrfs almost
never writes metadata items in the same location on disk twice. Each
version of the filesystem tree places its metadata in new locations,
overwriting metadata from older versions of the tree. There's no preset
metadata locations--if you want to find any metadata item, you have to
search for it in a tree, or scan the entire disk to find it.
If a metadata page write is dropped, the effect is that future reads
of the tree will get a random metadata page from an older version of
the filesystem tree. To prevent errors, btrfs labels every metadata
page with the transaction ID it was created in, and every pointer to
a page in btrfs metadata has a matching transaction ID number. If the
transid doesn't match, btrfs knows that the wrong page has been read from
the disk. To protect the integrity of the filesystem, btrfs treats this
event as if it was a read error, and tries to recover by reading the same
page from other mirror copies of metadata. If this is successful, btrfs
will replace the metadata page that failed parent transid verification.
btrfs check ignores the transid failure. Since the entire page is wrong,
most fields will fail verification after the transid check is ignored
(e.g. the root level check in this case). The only fields that _won't_
fail verification are fields with a small number of distinct values,
like a stopped clock that is correct twice a day. The messages following
"Ignoring transid failure" are garbage.
Unfortunately, if you have no intact mirror of the missing metadata page
(i.e. they were all corrupted by the same write reordering bug in the
storage stack), then btrfs can't access anything below the missing
metadata page in the tree, nor can btrfs safely update the tree.
That means the filesystem can't be mounted read-write (or will mount
read-write, but become read-only immediately upon detecting the parent
transit verify failure). Data loss can be severe, from zero to 100%,
depending on which metadata pages are lost and how large the write
cache is.
In theory it is possible to repair a parent transid verify failure by
brute-force searching the disk for an older copy of the metadata items
in the missing page, reinsert the items into the filesystem tree, then
repair inconsistencies in the metadata. AFAIK none of the existing btrfs
tools can perform this search.
If the drive firmware is the problem, then you might be able to use the
drive with 'hdparm -W0' or 'nvme set-feature -f 6 -v 0 -s' or 'smartctl
--set wcache,off' (you'll need to run it on every boot and resume from
suspend if applicable). It's a brute-force solution, but it usually makes
a drive with broken firmware usable. Another solution might be to swap
the SSD for a model with stronger countermeasures against power failure.
> I
> tried a bunch of other commands including:
> - btrfs rescue zero-log
> - btrfs rescue chunk-recover
> - btrfs check --repair
> - btrfs rescue super-recover
> - btrfs check --repair with the tree root found by btrfs-find-root
> - btrfs check --repair --init-csum-tree --init-extent-tree
> - btrfs restore
>
> I'm aware I probably executed some commands that don't make a lot of sense in my context but all of them failed with either the "root [4 0] level 0 does not match 1" message or a more generic "could not open ctree" or equivalent.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2022-02-16 7:54 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-02-09 10:53 Root level mismatch after sudden shutdown BERGUE Kevin
2022-02-09 21:03 ` Chris Murphy
2022-02-10 8:44 ` BERGUE Kevin
2022-02-10 1:33 ` Qu Wenruo
2022-02-10 8:48 ` BERGUE Kevin
2022-02-10 23:20 ` Chris Murphy
2022-02-16 7:54 ` Zygo Blaxell
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