Fwd: ext4_check_descriptors: Block bitmap for group 0 overlaps block group descriptors

Fwd: ext4_check_descriptors: Block bitmap for group 0 overlaps block group descriptors

[Bagas Sanjaya]

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

-- 
An old man doll... just what I always wanted! - Clara

Re: Fwd: ext4_check_descriptors: Block bitmap for group 0 overlaps block group descriptors

[Linux regression tracking #update (Thorsten Leemhuis)]

[TLDR: This mail in primarily relevant for Linux regression tracking. A
change or fix related to the regression discussed in this thread was
posted or applied, but it did not use a Closes: tag to point to the
report, as Linus and the documentation call for. Things happen, no
worries -- but now the regression tracking bot needs to be told manually
about the fix. See link in footer if these mails annoy you.]

On 11.06.23 04:27, Bagas Sanjaya wrote:
> 
> I notice a regression report on Bugzilla [1]. Quoting from it:
> 
>> Fail to mount a filesystem in kernel 6.4.0
>>
> [...]
> 
> #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

The reporter meanwhile confirmed that the issue is also fixed by
reverting ad3f09be6cf ("ext4: remove unnecessary check in
ext4_bg_num_gdb_nometa") and likely a dup of
https://lore.kernel.org/regressions/e61d9895-0c22-ae7b-1641-761a4932a966@leemhuis.info/

Revert already posted. Telling regzbot:

#regzbot monitor:
https://lore.kernel.org/all/60d81a63-4e8e-690d-b0c2-3c20c780a5d6@huaweicloud.com/
#regzbot monitor:
https://lore.kernel.org/all/20230613225025.3859522-1-shikemeng@huaweicloud.com/
#regzbot fix: Revert "ext4: remove unnecessary check in
ext4_bg_num_gdb_nometa"
#regzbot ignore-activity

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
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