Re: ext3/ext4 filesystem corruption under post 5.1.0 kernels

[Geert Uytterhoeven]

Hi Ted,

On Wed, May 15, 2019 at 6:57 AM Theodore Ts'o <tytso@xxxxxxx> wrote:
> Ah, I think I see the problem.  Sorry, this one was my fault.  Does
> this fix things for you?

Thanks!
Sorry for missing this patch in the thread before.

> From 0c72924ef346d54e8627440e6d71257aa5b56105 Mon Sep 17 00:00:00 2001
> From: Theodore Ts'o <tytso@xxxxxxx>
> Date: Wed, 15 May 2019 00:51:19 -0400
> Subject: [PATCH] ext4: fix block validity checks for journal inodes using indirect blocks
>
> Commit 345c0dbf3a30 ("ext4: protect journal inode's blocks using
> block_validity") failed to add an exception for the journal inode in
> ext4_check_blockref(), which is the function used by ext4_get_branch()
> for indirect blocks.  This caused attempts to read from the ext3-style
> journals to fail with:
>
> [  848.968550] EXT4-fs error (device sdb7): ext4_get_branch:171: inode #8: block 30343695: comm jbd2/sdb7-8: invalid block
>
> Fix this by adding the missing exception check.
>
> Fixes: 345c0dbf3a30 ("ext4: protect journal inode's blocks using block_validity")
> Reported-by: Arthur Marsh <arthur.marsh@xxxxxxxxxxxxxxxx>
> Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>

Intermittent issue no more seen in 10 test boots, so
Tested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds