This allows us to easily catch the bug fixed in previous patch. Here we also verify whether a page is tail page or not -- tail pages are supposed to be freed along with their head, not by themselves. Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx> --- mm/page_alloc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 736d8e1..2bcc770 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -750,6 +750,9 @@ static bool free_pages_prepare(struct page *page, unsigned int order) int i; int bad = 0; + VM_BUG_ON(PageTail(page)); + VM_BUG_ON(PageHead(page) && compound_order(page) != order); + trace_mm_page_free(page, order); kmemcheck_free_shadow(page, order); -- 2.1.0.rc2.206.gedb03e5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>