--- x/kernel/rcu/tree_stall.h
+++ y/kernel/rcu/tree_stall.h
@@ -590,8 +590,15 @@ static void rcu_check_gp_kthread_starvat
 			if (cpu_is_offline(cpu)) {
 				pr_err("RCU GP kthread last ran on offline CPU %d.\n", cpu);
 			} else if (!(data_race(READ_ONCE(rdp->mynode->qsmask)) & rdp->grpmask)) {
+				int i;
 				pr_err("Stack dump where RCU GP kthread last ran:\n");
 				dump_cpu_task(cpu);
+				for_each_online_cpu(i) {
+					if (i == cpu)
+						continue;
+					pr_err("Stack dump on CPU%d\n", i);
+					dump_cpu_task(i);
+				}
 			}
 			wake_up_process(gpk);
 		}