On 2021/7/24 下午5:47, Qu Wenruo wrote:

On 2021/7/24 下午5:25, Fernando Peral wrote:

quoted

Hi.

I'm having an error on the root partition of a opensuse leap 15.3 system.

I have been asking for help in the opensuse forums

The problem seems to have been caused by a faulty ram module wich has
been already replaced, but the error of the fs is still there.

It has been suggested that it has been a bitflip and to ask here if a
btrfs check and repair should be done. >


#btrfs
check --readonly --force /dev/nvme0n1p1
[1/7] checking root items
[2/7] checking extents
data backref 227831808 root 263 owner 7983 offset 0 num_refs 0 not found
in extent tree
incorrect local backref count on 227831808 root 263 owner 7983 offset 0
found 1 wanted 0 back 0x5559e0ab7020
incorrect local backref count on 227831808 root 263 owner
140737488363311offset 0 found 0 wanted 1 back 0x5559dde718d0

The owner number 140737488363311 (0x800000001f2f) really looks like a
bitflip in the high bit.

Thus the faulty memory theory looks pretty solid.

So far just two bad EXTENT_ITEM, I think btrfs check --repair is able to
fix it.

But before calling "btrfs check --repair", please backup all your
important data, as there is still a low chance that "btrfs check
--repair" may make things worse.

Thanks,
Qu

quoted

backref disk bytenr does not match extent record, bytenr=227831808, ref
bytenr=0
backpointer mismatch on [227831808 4096]
ERROR: errors found in extent allocation tree or chunk allocation
[3/7]checking free space cache
[4/7]checking fs roots
[5/7]checking only csums items (without verifying data)
[6/7]checking root refs
[7/7]checking quota groups
Qgroup are marked as inconsistent.
Opening filesystem to check...
Checking filesystem on /dev/nvme0n1p1
UUID: 5b000355-3a1a-49f5-8005-f10668008aa7
Rescan hasn't been initialized, a difference in qgroup accounting is
expected
found 51878920192 bytes used, error(s) found
total csum bytes: 48135312
total tree bytes: 991313920
total fs tree bytes: 885358592
total extent tree bytes: 48414720
btree space waste bytes: 151592274
file data blocks allocated: 239972728832
referenced 85539778560


pruebas:~# uname -a
Linux pruebas 5.3.18-59.13-default #1 SMP Tue Jul 6
07:33:56 UTC 2021 (23ab94f) x86_64 x86_64 x86_64 GNU/Linux


pruebas:~#btrfs --version
btrfs-progs v4.19.1  ç

My bad, your btrfs-progs looks a little old.

It would be safer to use newer btrfs.

Since it's your root fs, you may want to use a liveUSB with newer
btrfs-progs to fix the fs.

Thanks,
Qu

quoted

pruebas:~# btrfs fi show
Label: none  uuid: 5b000355-3a1a-49f5-8005-f10668008aa7
Totaldevices 1 FS bytes used 48.42GiB
devid  1 size 931.51GiB used 51.05GiB path /dev/nvme0n1p1


pruebas:~#btrfs fi df /
Data, single: total=49.01GiB, used=47.48GiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=2.01GiB, used=962.69MiB
GlobalReserve, single: total=101.06MiB, used=0.00B