guest_uname: DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
fixed_kernel_uname: DragonFly 6.5-DEVELOPMENT #1: Mon Oct 12 12:07:23 UTC 2026 root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC
compiler: cc 8.3 [DragonFly] Release/2019-02-22
kern.osreldate: 600519
kernel: stock INVARIANTS X86_64_GENERIC (clean-source `with-src` snapshot); fix validated on a single-fix rebuild of the same config
vfs.usermount: 0 (mount performed as root, matching the crafted-media threat model)
msdosfs: in-kernel client, mount_msdos on vn(4)-backed image (vnconfig -c -s labels)
serial note: mounting the crafted image prints "Warning: number of clusters (8172) exceeds FAT capacity (5120)" — the msdosfs_vfsops.c:486-490 clamp that sets pm_maxcluster=5119
code hashes:
  craftfat16.c  sha256 497c99713c7f1f928be50bc3c04eb4e6ba0adda4706c5cf7c78aa6debcf8f362