ext2fs_open2: Superblock checksum does not match superblock
../e2fsck/e2fsck: Superblock invalid, trying backup blocks...
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
Inode bitmap differences: Group 1 inode bitmap does not match checksum.
FIXED.

test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
test_filesys: 11/1024 files (0.0% non-contiguous), 1557/16384 blocks
Exit status is 0