fsck.vfat -n exited with status code 1
fsck.fat 4.2 (2021-01-31)
Wrong checksum for long file name "file0".
  (Short name F\377\377\377 may have changed without updating the long name)
  Not auto-correcting this.
Start cluster field in VFAT long filename slot is not 0 (but 0x0200).
Auto-setting to 0.
Orphaned long file name part "f:41fle2"
  Auto-deleting.
Wrong checksum for long file name "file.cold".
  (Short name FILE~1.i\272 may have changed without updating the long name)
  Not auto-correcting this.
/file0
  Bad short file name (F\377\377\377).
  Auto-renaming it.
  Renamed to FSCK0000.000
/file.cold
  Bad short file name (FILE~1.i\272).
  Auto-renaming it.
  Renamed to FSCK0000.001
/FSCK0000.000
 Start does point to root directory. Deleting dir. 
/í
  Bad start cluster 1. Truncating file.
/í
  File size is 10 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 4 unused clusters (65536 bytes).

Leaving filesystem unchanged.
/tmp/1892876136.img: 4 files, 1/7 clusters