From: zhouxianrong <zhouxianrong@xxxxxxxxxx> The last partial object in last subpage of zspage should not be linked in allocation list. Otherwise it could trigger BUG_ON explicitly at function zs_map_object. But it happened rarely. Signed-off-by: zhouxianrong <zhouxianrong@xxxxxxxxxx> --- mm/zsmalloc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 8d87e973a4f5..24dd8da0aa59 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -1040,6 +1040,8 @@ static void init_zspage(struct size_class *class, struct zspage *zspage) * Reset OBJ_TAG_BITS bit to last link to tell * whether it's allocated object or not. */ + if (off > PAGE_SIZE) + link -= class->size / sizeof(*link); link->next = -1UL << OBJ_TAG_BITS; } kunmap_atomic(vaddr); -- 2.13.6
