Patched-kernel build (guest /usr/src, fix_combined.diff = DF-5683+DF-5684+DF-5685+DF-5686 fixes):
  $ cd /usr/src && patch -p1 < /tmp/fix_combined.diff
  Patching file sys/kern/vfs_quota.c using Plan A...
  Hunk #1 succeeded at 40.
  ...
  Patching file sys/kern/kern_udev.c using Plan A...
  Hunk #1 succeeded at 1010.
  done
  PATCHED
  $ cd /usr/src && make -j6 nativekernel KERNCONF=X86_64_GENERIC
  ... (incremental build ~4 min on 6 vcpu) ...
  --------------------------------------------------------------
  >>> Kernel build for X86_64_GENERIC completed on Sat Oct 10 00:39:52 UTC 2026
  --------------------------------------------------------------
  $ make installkernel KERNCONF=X86_64_GENERIC DESTDIR=/
  --------------------------------------------------------------
  >>> Kernel install for X86_64_GENERIC completed on Sat Oct 10 00:42:02 UTC 2026
  --------------------------------------------------------------
  $ reboot
  -> DragonFly 6.5-DEVELOPMENT #1: Sat Oct 10 00:36:54 UTC 2026