diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index e5dfc7bf4944..e4ee998c00f3 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -388,13 +388,19 @@ static int isolate_single_pageblock(unsigned long boundary_pfn,
 		}
 
 		if (PageBuddy(page)) {
-			int order = buddy_order(page);
+			unsigned int order = buddy_order_unsafe(page);
 
-			/* pageblock_isolate_and_move_free_pages() handled this */
-			VM_WARN_ON_ONCE(pfn + (1 << order) > boundary_pfn);
-
-			pfn += 1UL << order;
-			continue;
+			/* buddy_order_unsafe() is racy. Validate the order before shifting. */
+			if (order <= MAX_PAGE_ORDER &&
+				/*
+				 * pageblock_isolate_and_move_free_pages() splits
+				 * cross-boundary PageBuddy, verify it.
+				 */
+			    pfn + (1UL << order) <= boundary_pfn) {
+				pfn += 1UL << order;
+				continue;
+			}
+			goto failed;
 		}
 
 		/*