linux-kernel - Fwd: ext4_check_descriptors: Block bitmap for group 0 overlaps block group descriptors

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Message-ID: <17d7e7f8-ad8d-1696-32b7-3ff9fd4548c1@gmail.com>
Date:   Sun, 11 Jun 2023 09:27:45 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux ext4 Development <linux-ext4@...r.kernel.org>
Subject: Fwd: ext4_check_descriptors: Block bitmap for group 0 overlaps block
 group descriptors

Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> Hi,
> 
> Fail to mount a filesystem in kernel 6.4.0
> 
> The Filesystem is clean. fsck -fp reports no errors
> 
> # uname -a
> Linux medusa.dds.de 6.4.0-rc5 #2 SMP PREEMPT_DYNAMIC Wed Jun  7 08:11:59 CEST 2023 x86_64 GNU/Linux
> # mount /dev/bigvg/lv_dat /mnt
> mount: /mnt: mount(2) system call failed: Structure needs cleaning.
>        dmesg(1) may have more information after failed mount system call.
> 
> Under Kernel 6.3.4 everything works with this Filesystem

The reporter then pasted short dmesg snippet:

> [  104.501659] EXT4-fs (dm-9): ext4_check_descriptors: Block bitmap for group 0 overlaps block group descriptors
> [  104.501664] EXT4-fs (dm-9): group descriptors corrupted!
> 

See Bugzilla for the full thread and attached dumpe2fs, lspci, and systeminfo.

Anyway, I'm adding it to regzbot:

#regzbot introduced: v6.3..v6.4 https://bugzilla.kernel.org/show_bug.cgi?id=217534
#regzbot title: Block bitmap for group 0 overlaps block group descriptors, causing mount failure

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217534

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