> The first thing I would do is print the new mbuf chain in m_makewritable.
> We have:
>         for (n = *mp; n; n = n->m_next)
> 		reslen += n->m_len;   
> 	if (origlen != reslen)
> 		panic("m_makewritable: length changed");
> 
> I would change it to:
>         for (n = *mp; n; n = n->m_next)
> 		reslen += n->m_len;   
> 	if (origlen != reslen) {
> 		for (n = *mp; n; n = n->m_next)
> 			printf("mbuf len %d type %d flags %d\n",
> 			    n->m_next, n->m_type, n->m_flags);
> 		printf("m_makewritable origlen %d newlen %d\n",
> 		    origlen, reslen);
> 		panic("m_makewritable: length changed");
> 	}

-current has m_print(), which i wrote after getting tired to
write this kind of debug printf again and again. :-)

YAMAMOTO Takashi