Re: Many I/O errors with btrfs on MicroSD and RPi

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

在 2024/9/9 07:00, Mobin Aydinfar 写道:
> Hi.
>
> My Raspberry Pi is down because btrfs reports I/O error. So I removed my
> MicroSD from RPi and I mounted it on my computer with ram-reader. btrfs
> check reports many problems.
>
> The documention says don't use btrfs check --repair unless you know what
> are you doing so I didn't use it.

That's the correct way to go.

Unfortunately from the output, it looks quite some of your metadata is
full of garbage now:

  BTRFS warning (device sdc2): tree block 121929728 mirror 1 has bad
bytenr, has 15771731761493389218 want 121929728
  BTRFS warning (device sdc2): tree block 121929728 mirror 2 has bad
bytenr, has 17159496520340310444 want 121929728

The "bytenr" is a u64 representing the logical address, should at least
always be aligned to sector size (4K in most cases).

Furthermore it shows both copy is corrupted, with different corruption.

It looks like the sdcard itself is not reliable thus a big chunk of data
is either discarded or filled with garbage.

So far no transid error, thus at least its FLUSH/FUA command handling
seems sane.

Thanks,
Qu
>
> I mounted the MicroSD and I copied all of its readable content and I
> tried to use "btrfs scrub start" but it got aborted after ~10GiB.
>
> I check RPi's dmesg everyday to ensure there is no under voltage, I'm
> sure that there is no under voltage issue but I had multiple power
> outages in 3 last months.
>
> I don't have dmesg from RPi, but I have dmesg from my computer (See the
> attachment).
>
> btrfs scrub status:
> UUID:             4c3054bf-5704-4afe-be0d-d2300359d493
> Scrub resumed:    Mon Sep  9 00:34:28 2024
> Status:           aborted
> Duration:         0:11:00
> Total to scrub:   33.99GiB
> Rate:             17.01MiB/s
> Error summary:    csum=52
>    Corrected:      4
>    Uncorrectable:  48
>    Unverified:     0
>
> My computer uname:
> Linux Mobin-Mehdi-PC 6.10.7-0-generic #1 SMP PREEMPT_DYNAMIC Thu Aug 29
> 16:26:29 UTC 2024 x86_64
>
> btrfs --version:
> btrfs-progs v6.10.1
> -EXPERIMENTAL -INJECT -STATIC +LZO +ZSTD +UDEV +FSVERITY +ZONED
> CRYPTO=builtin
>
> btrfs fi show:
> Label: none  uuid: 4c3054bf-5704-4afe-be0d-d2300359d493
>      Total devices 1 FS bytes used 33.79GiB
>      devid    1 size 59.02GiB used 39.07GiB path /dev/sdc2
>
> btrfs fi df /mnt/Removable:
> Data, single: total=35.01GiB, used=33.59GiB
> System, DUP: total=32.00MiB, used=16.00KiB
> Metadata, DUP: total=2.00GiB, used=200.53MiB
> GlobalReserve, single: total=54.44MiB, used=0.00B
>
> dmesg: As mentioned, Check the attachment.
>
> Best Regards.