diff --git a/mm/workingset.c b/mm/workingset.c
index e9f05634747a..a848572f8c8a 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -270,7 +270,13 @@ static bool lru_gen_test_recent(void *shadow, struct lruvec **lruvec,
 	struct pglist_data *pgdat;
 
 	unpack_shadow(shadow, &memcg_id, &pgdat, token, workingset);
-
+	if (unlikely(!pgdat)) {
+		pr_warn("FATAL: Corrupted shadow entry - pgdat is NULL! shadow=%p\n", shadow);
+		pr_warn("This indicates page cache corruption - cannot proceed\n");
+		dump_stack();
+		*lruvec = NULL;
+		return false;
+	}
 	memcg = mem_cgroup_from_id(memcg_id);
 	*lruvec = mem_cgroup_lruvec(memcg, pgdat);