diff --git a/mm/vmscan.c b/mm/vmscan.c
index e366ac953d3822adc319e7c2361af6389ab4fb63..8e6dfc5386c9a47e8ee7495acca8664fbc71de85 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1890,7 +1890,12 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
 			continue;
 		}
 
-		lruvec = mem_cgroup_page_lruvec(page, pgdat);
+		/*
+		 * All pages were isolated from the same lruvec (and isolation
+		 * inhibits memcg migration).
+		 */
+		VM_BUG_ON_PAGE(mem_cgroup_page_lruvec(page, page_pgdat(page))
+							!= lruvec, page);
 		lru = page_lru(page);
 		nr_pages = thp_nr_pages(page);