fix_build_excerpt.txt - DF-2691 fix kernel build (guest /tmp/kbuild.log, ~17,087 lines, full log lost to the post-validation snapshot reset)

build commands (run in guest /usr/src):
  make nativekernel KERNCONF=X86_64_GENERIC
  make installkernel KERNCONF=X86_64_GENERIC

markers from the log tail:
  ...
  BUILD_INSTALL_DONE                      <- line 17087 (nativekernel + installkernel both completed)
  >>> Kernel install for X86_64_GENERIC completed on Sun Aug 30 22:07:15 UTC 2026
  FINISHED
  /boot/kernel/kernel  -r-xr-xr-x 1 root wheel 119341088 Aug 30 22:06

patch application:
  cd /usr/src && patch -p1 < /tmp/fix.diff
  Patching file sys/kern/kern_sig.c using Plan A...
  Hunk #1 succeeded at 2681.
  Hunk #2 succeeded at 2708.
  grep -c KN_DETACHED /usr/src/sys/kern/kern_sig.c -> 3

booted kernel:
  DragonFly 6.5-DEVELOPMENT #1: Sun Aug 30 21:53:26 UTC 2026  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC