I am getting ``panic: ptdi 1d1023'' which, while not a really helpful
message, is from i386/pmap.c;

        /*
         * Page Directory table entry not valid, we need a new PT page
         */
        pte = pmap_pte(pmap, va);
        if (!pte)
                panic("ptdi %x", pmap->pm_pdir[PTDPTDI]);


Any guesses what went wrong?  This is from a kernel just compiled today, from
fresh sources.

--Michael