expand32
if (x != expand32(POISON_INUSE)) {
i * sizeof(x), x, expand32(POISON_INUSE));
x = expand32(POISON_FREE);
expand32(POISON_INUSE), &rq);
if (x != expand32(POISON_INUSE)) {
i * sizeof(x), x, expand32(POISON_INUSE));
x = expand32(POISON_FREE);