recent 5.99.63/amd64 panic during boot

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

With sources updated about 201202030300Z, an amd64 kernel panics
during startup as follows (hand-transcribed):

[...]
Updating fontconfig cache: done
Creating a.out runtime link editor directory cache.
panic: kernel diagnostic assertion "size > 0" failed: file 
"/d0/nbsd/src/sys/kern/subr_kmem.c", line 220
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff802590c5 cs 8 rflags 246 cr2  ffffef3c cpl 0 rsp 
fffffe80070b7730
Stopped in pid 459.1 (ldconfig) at      netbsd:breakpoint+0x5:  leave
db{1}> bt
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x1f2
kern_assert() at netbsd:kern_assert+0x48
kmem_intr_free() at netbsd:kmem_intr_free+0x9b
netbsd32_elf32_copyargs() at netbsd:netbsd32_elf32_copyargs+0x2c8
execve1() at netbsd:execve1+0xcd3
syscall() at netbsd:syscall+0xc4
db{1}> _


The machine is an Intel board with Core 2 Duo E6750 2.66GHz processor
(supports EM64T and VMX among other things).

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