Re: [regression 6.1.y] f2fs: invalid zstd compress level: 6

[Salvatore Bonaccorso <carnil@debian.org>]

Hi,

On Mon, Feb 19, 2024 at 10:35:13AM +0800, Chao Yu wrote:
> On 2024/2/9 4:19, Salvatore Bonaccorso wrote:
> > Hi Jaegeuk Kim, Chao Yu,
> > 
> > In Debian the following regression was reported after a Dhya updated
> > to 6.1.76:
> > 
> > On Wed, Feb 07, 2024 at 10:43:47PM -0500, Dhya wrote:
> > > Package: src:linux
> > > Version: 6.1.76-1
> > > Severity: critical
> > > Justification: breaks the whole system
> > > 
> > > Dear Maintainer,
> > > 
> > > After upgrade to linux-image-6.1.0-18-amd64 6.1.76-1 F2FS filesystem
> > > fails to mount rw.  Message in the boot journal:
> > > 
> > >    kernel: F2FS-fs (nvme0n1p6): invalid zstd compress level: 6
> > > 
> > > There was recently an f2fs patch to the 6.1 kernel tree which might be
> > > related: https://www.spinics.net/lists/stable-commits/msg329957.html
> > > 
> > > Was able to recover the system by doing:
> > > 
> > > sudo mount -o remount,rw,relatime,lazytime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,extent_cache,mode=adaptive,active_logs=6,alloc_mode=default,checkpoint_merge,fsync_mode=posix,compress_algorithm=lz4,compress_log_size=2,compress_mode=fs,atgc,discard_unit=block,memory=normal /dev/nvme0n1p6 /
> > > 
> > > under the running bad 6.1.0-18-amd64 kernel, then editing
> > > /etc/default/grub:
> > > 
> > >    GRUB_DEFAULT="Advanced options for Debian GNU/Linux>Debian GNU/Linux, with Linux 6.1.0-17-amd64"
> > > 
> > > and running 'update-grub' and rebooting to boot the 6.1.0-17-amd64
> > > kernel.
> > 
> > The issue is easily reproducible by:
> > 
> > # dd if=/dev/zero of=test.img count=100 bs=1M
> > # mkfs.f2fs -f -O compression,extra_attr ./test.img
> > # mount -t f2fs -o compress_algorithm=zstd:6,compress_chksum,atgc,gc_merge,lazytime ./test.img /mnt
> > 
> > resulting in
> > 
> > [   60.789982] F2FS-fs (loop0): invalid zstd compress level: 6
> 
> Hi Salvatore,
> 
> Can you please try below fixes:
> 
> [PATCH 6.1] f2fs: add helper to check compression level
> https://lore.kernel.org/linux-f2fs-devel/20240212160530.1017205-1-chao@kernel.org

Confirmed that this fixes the reported issue as it was reported to us
in Debian in https://bugs.debian.org/1063422 . Thanks a lot!
(note just tested with the first commit as it landed in 6.1.78 to
confirm the immediate regression).

#regzbot fixed-by: cf3d57ad6ff8b566deba3544b9ad3384781fb604

Regards,
Salvatore