diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index e000a62..95c7b61 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1509,6 +1509,9 @@
 		raw_spin_unlock_irqrestore(&rnp->lock, flags);
 	if (need_report & RCU_OFL_TASKS_EXP_GP)
 		rcu_report_exp_rnp(rsp, rnp, true);
+	WARN_ONCE(rdp->qlen != 0 || rdp->nxtlist != NULL,
+		  "rcu_cleanup_dead_cpu: Callbacks on offline CPU %d: qlen=%lu, nxtlist=%p\n",
+		  cpu, rdp->qlen, rdp->nxtlist);
 }
 
 #else /* #ifdef CONFIG_HOTPLUG_CPU */