64-bit filesystem support is not enabled. The larger fields afforded by this feature enable full-strength checksumming. Pass -O 64bit to rectify. Creating filesystem with 65536 4k blocks and 16384 inodes Superblock backups stored on blocks: 32768 Allocating group tables: done Writing inode tables: done Creating journal (4096 blocks): done Writing superblocks and filesystem accounting information: done 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 test_filesys: 11/16384 files (0.0% non-contiguous), 5164/65536 blocks Exit status is 0 debugfs write journal disable metadata_csum on a dirty-journal fs Recovering journal. fsck the whole mess 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 Block bitmap differences: +(0--1050) +(32768--36880) Fix? yes Inode bitmap differences: +(1--11) Fix? yes test_filesys: ***** FILE SYSTEM WAS MODIFIED ***** test_filesys: 11/16384 files (0.0% non-contiguous), 5164/65536 blocks Exit status is 1