The huge zero page could reach here and if we ever try to split it, the
VM_BUG_ON_PAGE will be triggered in split_huge_page_to_list(). Also the
non-lru compound movable pages could be taken for transhuge pages. Skip
these pages by checking PageLRU because huge zero page isn't lru page as
non-lru compound movable pages.
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
mm/memory-failure.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 23bfd809dc8c..ac6492e36978 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1792,6 +1792,20 @@ int memory_failure(unsigned long pfn, int flags)
}
if (PageTransHuge(hpage)) {
+ /*
+ * The non-lru compound movable pages could be taken for
+ * transhuge pages. Also huge zero page could reach here
+ * and if we ever try to split it, the VM_BUG_ON_PAGE will
+ * be triggered in split_huge_page_to_list(). Skip these
+ * pages by checking PageLRU because huge zero page isn't
+ * lru page as non-lru compound movable pages.
+ */
+ if (!PageLRU(hpage)) {
+ put_page(p);
+ action_result(pfn, MF_MSG_UNSPLIT_THP, MF_IGNORED);
+ res = -EBUSY;
+ goto unlock_mutex;
+ }
/*
* The flag must be set after the refcount is bumped
* otherwise it may race with THP split.
--
2.23.0
