DB_SEARCH
db_search.db_state = DB_SEARCH;
if (d1->db_state == DB_SEARCH) {
ASSERT3S(d2->db_state, !=, DB_SEARCH);
} else if (d2->db_state == DB_SEARCH) {
ASSERT3S(d1->db_state, !=, DB_SEARCH);
db_search.db_state = DB_SEARCH;
db_search.db_state = DB_SEARCH;
db_marker.db_state = DB_SEARCH;