fsck.msdos -n exited with status code 1
fsck.fat 4.2 (2021-01-31)
/FILE1 \377\377.
  Bad short file name (FILE1 \377\377.).
  Auto-renaming it.
  Renamed to FSCK0000.000
/FILE0/
  Expected a valid '.' entry in this slot.
  Moving entry down.
/FILE0/
  Bad short file name ().
  Auto-renaming it.
  Renamed to FSCK0000.000
/FILE0/FSCK0000.000
 Start does point to containing directory. Deleting entry.
Volume label 'SYZKALLER' stored in root directory and label '' stored in boot sector and different.
  Auto-copying volume label from root directory to boot sector.

Leaving filesystem unchanged.
/tmp/3864719138.img: 7 files, 5/7 clusters