loader.conf "Error: stack overflow"

Using -CURRENT as of a few hours ago:

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FreeBSD/i386 bootstrap loader, Revision 1.1
(toor_at_pakastelohi.cypherpunks.to, Sun Aug 10 13:37:08 CEST 2003)
Loading /boot/defaults/loader.conf
Error: stack overflow
\
/boot/kernel/kernel text=0x30ee80 data=0x33f98+0x57160
syms=[0x4+0x3c2d0+0x4+0x4
a11b]
Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel]...
/boot/kernel/acpi.ko
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Might be an ACIP problem. Google didn't show this error, though.
Fortunately, the boot process continues after the error.

--Lucky