Re: Help with ROFS on Cache Folder Deletion

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

在 2024/5/2 15:59, Eliza May 写道:
> Hi,
>
>
> I am trying to remove the paru .cache folder from my computer, but every
> time I do my btrfs filesystem goes read-only. Here is the dmesg output:
> https://termbin.com/f4sw
>
> A scrub found no errors, and I have not yet ran a check -- I will be
> doing so and reporting back when I figure out how to do so.
>
>
> My filesystem is a main partition, a separate home subvolume, a var/log
> subvolume, and a /var/cache/pacman/pkg subfolder, but I am attempting to
> delete the paru one; not the pacman one.
>
>
> If there are any other logs or details I should include, let me know.

The dump tree shows:

[ 1623.783513] 	item 97 key (3069062266880 169 0) itemoff 13049 itemsize 33
[ 1623.783514] 		extent refs 1 gen 1396868 flags 2
[ 1623.783515] 		ref#0: tree block backref root 16391
...
[ 1623.783683] BTRFS critical (device nvme0n1p2: state EA): unable to
find ref byte nr 3069062266880 parent 0 root 7 owner 0 offset 0 slot 98

This means the bytenr 3069062266880 should have a tree backref for root 7.
But the dump tree shows it belongs to root 16391.

Furthermore this looks like a memory biflip:

hex(7)     = 0x0007
hex(16391) = 0x4007

So please unmount all your fs and run a memtest first to make sure your
hardware memory is working correctly.
And do necessary memory replacement (if possible).

Then finally run "btrfs check --readonly" for the unmounted fs, to make
sure that is the only error (please paste the output).

Then we can determine if it's safe to run "btrfs check --repair" or
there are too many corruption and can only do a data salvage.
(I bet a repair can be done, but still want to be sure)

Thanks,
Qu
>
>
> Thank you,
>
> Eliza
>
>