Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Symlink /a (inode #12) is invalid.
Clear? yes

Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
test_filesys: 11/16 files (9.1% non-contiguous), 21/100 blocks
Exit status is 1