== PoC build (baseline guest, stock kernel) ==
+ cc -O1 -o /tmp/tls_noncanon /tmp/tls_noncanon.c && chown nobody /tmp/tls_noncanon
BUILD_OK
(no diagnostics)

== PoC build (patched guest) ==
+ cc -O1 -o /tmp/tls_noncanon /tmp/tls_noncanon.c && cc -O1 -o /tmp/tls_edge /tmp/tls_edge.c
BUILD_OK
(gcc: one benign implicit-declaration warning for syscall(2) in the ad-hoc
 gscheck.c only; PoC proper compiles clean with -O1)

== Fix kernel build (in guest, patched /usr/src) ==
+ cd /usr/src && patch -p1 < /tmp/fix.diff
Patching file sys/platform/pc64/x86_64/tls.c using Plan A: Hunk #1 succeeded at 101.
Patching file sys/platform/pc64/x86_64/machdep.c using Plan A: Hunk #1 succeeded at 923.
PATCH_APPLIED
+ make -j6 nativekernel KERNCONF=X86_64_GENERIC   (first attempt: plain
  buildkernel refused -- "You must buildworld before buildkernel"; snapshot
  has no built world tools; nativekernel is the documented alternative)
  ... full kernel compile, -Werror, no errors ...
NATIVEKERNEL_DONE
+ make installkernel KERNCONF=X86_64_GENERIC
INSTALL_DONE
+ reboot -> uname -a:
  DragonFly dfbsd 6.5-DEVELOPMENT #1: Fri Oct  9 03:00:09 UTC 2026
  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC x86_64