Bug#995425: linux-image-amd64: kernel BUG at fs/ext4/ext4_extents.h:199! (fast_commit feature)

[Salvatore Bonaccorso <carnil@debian.org>]

Control: tags -1 + moreinfo

On Thu, Sep 30, 2021 at 08:26:38PM -0500, Nelson G wrote:
> Package: linux-image-amd64
> Version: 5.10.46-5
> Severity: normal
> 
> Hello,
> 
> There's a bug for the ext4 filesystem, when the fast_commit flag is enabled and
> you use fallocate or any other task that allocates space.
> 
> 
> You can easily reproduce this bug on a VM or raw hardware by doing the
> following:
> 
> 1° You'll need a drive formatted with ext4 of course.
> 2° Enable fast_commit in that drive:  tune2fs -O fast_commit /dev/yourdrive
> 3° mount 'yourdrive', and inside 'yourdrive' try the following: fallocate -l
> 2000MB file

Can you check if the following fixes your issue?

https://lore.kernel.org/linux-ext4/20210820044505.474318-1-houtao1@huawei.com/

https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?h=dev&id=a2c2f0826e2b75560b31daf1cd9a755ab93cf4c6

Regards,
Salvatore