Pull up following revision(s) (requested by maxv in ticket #465):
sys/kern/kern_proc.c: revision 1.209
If no auxv is present, don't kmem_alloc(0). Easy to panic the kernel by
typing 'cat /proc/aout_pid/auxv' on whatever a.out binary you're running.
Fortunately, amd64 does not enable EXEC_AOUT by default. Unfortunately,
i386 does enable it by default.

(snj)