Re: [PATCH 2/2] btrfs: tree-checker: check item_size for dev_item

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

On 2022/2/5 20:30, Wang Yugui wrote:
> Hi,
>
>>>> A btrfs filesystem failed to boot with this patch.
>>>>
>>>> corrupt leaf: root=3 block=1081344 slot=0 devid=1 invalid item
>>>> size: has 0 expect 98
>>>>
>>>> Any way to fix it online?
>>>
>>> This btrfs filesystem is created by centos 7.9 installer (btrfs
>>> 4.9?)
>>> about 1 years ago.  and then mainly writen by kernel
>>> 5.4/5.10/5.15.
>>>
>> Yes, btrfs-progs v4.9 and v3.10 based kernel.
>> I created a btrfs and it looks fine.
>> Could please provide output of
>> btrfs inspect-internal dump-tree $device -t 3
>> ?
>> You can trim it if the content is too long only leaf 1081344 is needed.
>
> Hi,
>
> # btrfs filesystem show /
> Label: 'OS_T640'  uuid: 73dcce98-8f6b-4ec8-bfac-fa7c7c87409d
>          Total devices 10 FS bytes used 5.53TiB
>          devid    1 size 799.00GiB used 332.01GiB path /dev/sda2
>          devid    2 size 1.75TiB used 741.00GiB path /dev/sdg1
>          devid    3 size 1.75TiB used 745.00GiB path /dev/sdj1
>          devid    4 size 1.75TiB used 740.00GiB path /dev/sdi1
>          devid    5 size 1.75TiB used 745.00GiB path /dev/sdd1
>          devid    6 size 1.75TiB used 480.00GiB path /dev/sde1
>          devid    7 size 1.75TiB used 480.00GiB path /dev/sdh1
>          devid    8 size 1.75TiB used 479.00GiB path /dev/sdc1
>          devid    9 size 1.75TiB used 480.00GiB path /dev/sdb1
>          devid   10 size 1.75TiB used 479.00GiB path /dev/sdf1
>
> #btrfs inspect-internal dump-tree /dev/sda2 -t 3 > 3.txt
>
> and then 3.txt is zipped as  this attachment file(3.zip)

Full dmesg of the boot failure please.

The dump-tree shows the device item is completely sane, it has size 98,
not the value (0) reported from tree-checker.

Thus I don't know why tree-checker is reporting this problem.

Thanks,
Qu
>
> Best Regards
> Wang Yugui (wangyugui@e16-tech.com)
> 2022/02/05
>
>