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