BUDDY_HEADER_OFF
if (freed && BUDDY_HEADER_OFF <= i &&
i < BUDDY_HEADER_OFF + sizeof(struct buddy_header))
return (struct buddy_header __arena *)(address + BUDDY_HEADER_OFF);
if (size < BUDDY_HEADER_OFF + sizeof(struct buddy_header __arena))
asan_poison(address + BUDDY_HEADER_OFF, BUDDY_POISONED,