Odd sysctl -d kern.bootfile result

From: Mark Millard <marklmi_at_yahoo.com>
Date: Sun, 13 Nov 2022 04:14:50 UTC 
The context:

# ls -Tldt /boot/kern*/kernel
-r-xr-xr-x  1 root  wheel  40003240 Nov  6 16:32:05 2022 /boot/kernel/kernel
-r-xr-xr-x  1 root  wheel  39990232 Jul  6 11:21:16 2022 /boot/kernel.old/kernel
-r-xr-xr-x  1 root  wheel  31401824 Aug 19 03:16:29 2021 /boot/kernel.dbg/kernel

# uname -apKU # Note: output line split for readability
FreeBSD amd64_ZFS 14.0-CURRENT FreeBSD 14.0-CURRENT #55
main-n259064-f83db6441a2f-dirty: Sun Nov  6 16:31:55 PST 2022
root@amd64_ZFS:/usr/obj/BUILDs/main-amd64-nodbg-clang/usr/main-src/amd64.amd64/sys/GENERIC-NODBG
amd64 amd64 1400073 1400073


But . . .

# sysctl -d kern.bootfile
kern.bootfile: Name of kernel file booted

# sysctl -W kern.bootfile
kern.bootfile: /boot/kernel.old/kernel

Looks wrong to me. (I've never explicitly assigned to kern.bootfile .)

===
Mark Millard
marklmi at yahoo.com