uname -a:
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

compiler: cc 8.3 [DragonFly] Release/2019-02-22
fs: HAMMER1, version 7 (iscsi_crc32), single volume /dev/vn0 (file-backed, 12G sparse)
mount: mount -t hammer /dev/vn0 /mnt (rw)
trigger: hammer reblock /mnt  (HAMMER_IOC_DO_FLAGS, free_level=0 from default 100% fill)
sysctl: vfs.hammer.debug_general=0x4000 (D/B trace lines)
guest: dfbsd-qemu/vm.sh KVM guest, stock kernel from this tree (clean-source snapshot)