KASAN_VMALLOC_INVALID
case KASAN_VMALLOC_INVALID:
__memset(page_to_virt(page), KASAN_VMALLOC_INVALID, PAGE_SIZE);
__memset((void *)shadow_start, KASAN_VMALLOC_INVALID, shadow_end - shadow_start);
kasan_poison(start, size, KASAN_VMALLOC_INVALID, false);