fsck.vfat -n exited with status code 1
fsck.fat 4.2 (2021-01-31)
FATs differ but appear to be intact.
  Using first FAT.
Wrong checksum for long file name "file0".
  (Short name FILE may have changed without updating the long name)
  Not auto-correcting this.
Unfinished long file name ":0R-".
  (Start may have been overwritten by FILE1)
  Not auto-correcting this.
Long filename fragment "" found outside a LFN sequence.
  (Maybe the start bit is missing on the last fragment)
  Not auto-correcting this.
/file0
  Bad short file name (FILE).
  Auto-renaming it.
  Renamed to FSCK0000.000
/

  Bad short file name (
).
  Auto-renaming it.
  Renamed to FSCK0000.001
/FILE~
  Bad short file name (FILE~).
  Auto-renaming it.
  Renamed to FSCK0000.002
/FSCK0000.000
  Directory has non-zero size. Fixing it.
/FSCK0000.000
  Start cluster beyond limit (65280 > 8). Truncating file.
/FILE1
  File size is 16779008 bytes, cluster chain length is 0 bytes.
  Truncating file to 0 bytes.
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.
Reclaimed 3 unused clusters (49152 bytes).
Dirty bit is set. Fs was not properly unmounted and some data may be corrupt.
 Automatically removing dirty bit.

Leaving filesystem unchanged.
/tmp/592680881.img: 5 files, 2/7 clusters