diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 173e3ce60790..eca3df7f041c 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -523,7 +523,9 @@ static void synchronize_sched_expedited_wait(void)
 				mask = leaf_node_cpu_bit(rnp, cpu);
 				if (!(READ_ONCE(rnp->expmask) & mask))
 					continue;
+				preempt_disable(); // For smp_processor_id() in dump_cpu_task().
 				dump_cpu_task(cpu);
+				preempt_enable();
 			}
 		}
 		jiffies_stall = 3 * rcu_jiffies_till_stall_check() + 3;