Guest (host of the vkernel):
  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
  hw.ncpu = 6
  kern.clockrate: { hz = 100, tick = 10000, tickadj = 5, profhz = 101, stathz = 101 }
  vm.vkernel_enable: 0 -> 1 (runtime sysctl; fresh snapshot)
  cc 8.3 [DragonFly] Release/2019-02-22
  /var/vkernel created (vkernel memory image dir)

vkernel under test (both builds):
  DragonFly 6.5-DEVELOPMENT #0: Wed Oct  7 20:38:58 UTC 2026 (kernel.instr, md5-build 20:39)
  built from guest /usr/src with make -j6 nativekernel KERNCONF=VKERNEL64
  DF-5474 link workaround: SYSTEM_LD+= -Wl,--defsym,__build_id_start=0 -Wl,--defsym,__build_id_end=0
  boot: ./kernel.{instr,fixed} -m 512m -r /vkroot2.img -n 2 -e init_path=/bin/vkinit
  /vkroot2.img MD5 = 294609b16444834ea910b4758dfce33b (1200 MB ufs, DF-5337/DF-5538/DF-5556 rig style)
  in-guest-vkernel kern.clockrate: { hz = 20, tick = 50000, tickadj = 25, profhz = 21, stathz = 21 }
  use_precise_timer = 0 (default; init.c:126) -> coarse-sleep clamp active (systimer.c:275-282)

/usr/src restored to pristine after builds (systimer.c, vkernel64/conf/Makefile).