--- zzzz-none-000/linux-4.4.271/kernel/rcu/tree.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/kernel/rcu/tree.c	2023-04-19 10:22:30.000000000 +0000
@@ -392,6 +392,9 @@
 module_param(qhimark, long, 0444);
 module_param(qlowmark, long, 0444);
 
+int rcu_cpu_stall_panic __read_mostly; /* 1 = panic when cpu stall. */
+module_param(rcu_cpu_stall_panic, int, 0644);
+
 static ulong jiffies_till_first_fqs = ULONG_MAX;
 static ulong jiffies_till_next_fqs = ULONG_MAX;
 
@@ -1339,6 +1342,8 @@
 
 	rcu_dump_cpu_stacks(rsp);
 
+	if (rcu_cpu_stall_panic)
+		panic("print_cpu_stall");
 	raw_spin_lock_irqsave(&rnp->lock, flags);
 	if (ULONG_CMP_GE(jiffies, READ_ONCE(rsp->jiffies_stall)))
 		WRITE_ONCE(rsp->jiffies_stall,