Hi, it looks like I am hitting a similar issue as reported by Borislav Petkov in April 2022 ( https://lore.kernel.org/lkml/YmqOqGKajOOx90ZY@xxxxxxx/ ). I'm on kernel 6.0.5 and see this on arm64 as well as x86_64. I have a 100% reproducer using a loop mount, here it is: truncate -s 16g ext4.img mkfs.ext4 ext4.img 500m mkdir ext4.mnt mount ext4.img ext4.mnt resize2fs ext4.img And these are the kernel messages it generates: [ 33.774267] loop0: detected capacity change from 0 to 33554432 [ 33.796319] EXT4-fs (loop0): mounted filesystem with ordered data mode. Quota mode: none. [ 33.796518] ext4 filesystem being mounted at /root/ext4.mnt supports timestamps until 2038 (0x7fffffff) [ 33.799324] EXT4-fs (loop0): resizing filesystem from 512000 to 16777216 blocks [ 33.933110] EXT4-fs (loop0): resized filesystem to 16777216 [ 33.965633] EXT4-fs (loop0): Invalid checksum for backup superblock 8193 [ 33.965675] EXT4-fs error (device loop0) in ext4_update_backup_sb:174: Filesystem failed CRC [ 33.965884] EXT4-fs (loop0): Invalid checksum for backup superblock 24577 [ 33.965902] EXT4-fs error (device loop0) in ext4_update_backup_sb:174: Filesystem failed CRC [ 33.966058] EXT4-fs (loop0): Invalid checksum for backup superblock 40961 [ 33.966075] EXT4-fs error (device loop0) in ext4_update_backup_sb:174: Filesystem failed CRC [ 33.966225] EXT4-fs (loop0): Invalid checksum for backup superblock 57345 [ 33.966242] EXT4-fs error (device loop0) in ext4_update_backup_sb:174: Filesystem failed CRC [ 33.966398] EXT4-fs (loop0): Invalid checksum for backup superblock 73729 [ 33.966415] EXT4-fs error (device loop0) in ext4_update_backup_sb:174: Filesystem failed CRC [ 33.966557] EXT4-fs (loop0): Invalid checksum for backup superblock 204801 [ 33.966574] EXT4-fs error (device loop0) in ext4_update_backup_sb:174: Filesystem failed CRC [ 33.966765] EXT4-fs (loop0): Invalid checksum for backup superblock 221185 [ 33.966784] EXT4-fs error (device loop0) in ext4_update_backup_sb:174: Filesystem failed CRC [ 33.966946] EXT4-fs error (device loop0) in ext4_update_backup_sb:174: Filesystem failed CRC [ 33.967074] EXT4-fs error (device loop0) in ext4_update_backup_sb:174: Filesystem failed CRC [ 33.967237] EXT4-fs error (device loop0) in ext4_update_backup_sb:174: Filesystem failed CRC e2fsck seems mostly happy, should I be concerned? e2fsck ext4.img e2fsck 1.46.2 (28-Feb-2021) ext4.img contains a file system with errors, check forced. Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information ext4.img: 11/4161536 files (0.0% non-contiguous), 536410/16777216 blocks Thank you, Jakob
