NOTE: guest /tmp is tmpfs; the build/install logs were wiped by the fix-cycle
reboot. Captured verbatim from the verification session transcript:

  (in-guest, as root, after applying fix.diff to /usr/src)
  # cd /usr/src && make -j6 nativekernel KERNCONF=X86_64_GENERIC
    ... (full build, ~13 minutes, backgrounded with log to /tmp/kbuild.log)
  # grep -c "Error" /tmp/kbuild.log
  0
  # ls -l /usr/obj/usr/src/sys/X86_64_GENERIC/kernel
  (kernel linked)
  # make installkernel KERNCONF=X86_64_GENERIC
  INSTALL-OK
  >>> Kernel install for X86_64_GENERIC completed on Mon Aug 31 14:47:24 UTC 2026
  # reboot

Post-reboot uname (patched kernel #1):
  DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #1: Mon Aug 31 14:40:37 UTC 2026
      root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
(baseline vulnerable kernel was #0: Thu Jul  2 06:02:54 UTC 2026)