diff --git a/mm/vmscan.c b/mm/vmscan.c
index 12a69e6c10ba..534ff623719d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1312,6 +1312,7 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode)
 
 		if (PageDirty(page)) {
 			struct address_space *mapping;
+			bool migrate_dirty;
 
 			/* ISOLATE_CLEAN means only clean pages */
 			if (mode & ISOLATE_CLEAN)
@@ -1320,10 +1321,19 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode)
 			/*
 			 * Only pages without mappings or that have a
 			 * ->migratepage callback are possible to migrate
-			 * without blocking
+			 * without blocking. However, we can be racing with
+			 * truncation so it's necessary to lock the page
+			 * to stabilise the mapping as truncation holds
+			 * the page lock until after the page is removed
+			 * from the page cache.
 			 */
+			if (!trylock_page(page))
+				return ret;
+
 			mapping = page_mapping(page);
-			if (mapping && !mapping->a_ops->migratepage)
+			migrate_dirty = mapping && mapping->a_ops->migratepage;
+			unlock_page(page);
+			if (!migrate_dirty)
 				return ret;
 		}
 	}