common_netbuf_str
extern const char *common_netbuf_str(struct netbuf *);
addr_str = common_netbuf_str(&si.sv_addr);
addr_str = common_netbuf_str(&si.sv_addr);
common_netbuf_str(&srv.saddr));
mdb_printf("(%s/%s) ", id_val, common_netbuf_str(&nb));
common_netbuf_str(&xprt->xp_rtaddr));