diff -up ./kernel/sched/wait.c.rd2 ./kernel/sched/wait.c
--- ./kernel/sched/wait.c.rd2	2024-05-17 20:42:39.534096198 +0900
+++ ./kernel/sched/wait.c	2024-05-17 20:46:21.977210958 +0900
@@ -75,6 +75,11 @@ static int __wake_up_common(struct wait_
 {
 	wait_queue_entry_t *curr, *next;
 
+	if (!wq_head) {
+		printk(KERN_WARNING "%s: wq_head=%pS is NULL, returning immediately\n", __func__, wq_head);
+		return nr_exclusive;
+	}
+
 	lockdep_assert_held(&wq_head->lock);
 
 	curr = list_first_entry(&wq_head->head, wait_queue_entry_t, entry);