$ vm.sh reset with-src   (restore clean INVARIANTS guest after baseline panic)
up (pid 455062)
$ kldload /tmp/sipmod_fixed/siphashtest_fixed.ko && echo KLDLOAD_OK
KLDLOAD_OK
$ dmesg | grep siphashtest
siphashtest: calling SipHash24_TestVectors()
siphashtest: result=1 (no panic)
$ kldunload siphashtest_fixed && echo UNLOADED
UNLOADED
$ echo GUEST_HEALTHY
GUEST_HEALTHY
(result=1 == all 64 reference vectors match in-kernel; no panic, clean unload)