diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index f108a95..2fddd98 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -164,6 +164,23 @@ static bool rcu_lock_break(struct task_struct *g, struct task_struct *t)
 	return can_cont;
 }
 
+static void print_all_running_threads(void)
+{
+#ifdef CONFIG_SMP
+	struct task_struct *g;
+	struct task_struct *t;
+
+	rcu_read_lock();
+	for_each_process_thread(g, t) {
+		if (!t->on_cpu || t == current)
+			continue;
+		pr_err("INFO: Currently running\n");
+		sched_show_task(t);
+	}
+	rcu_read_unlock();
+#endif
+}
+
 /*
  * Check whether a TASK_UNINTERRUPTIBLE does not get woken up for
  * a really long time (120 seconds). If that happens, print out
@@ -201,7 +218,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
 	if (hung_task_show_lock)
 		debug_show_all_locks();
 	if (hung_task_call_panic) {
-		trigger_all_cpu_backtrace();
+		print_all_running_threads();
 		panic("hung_task: blocked tasks");
 	}
 }
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index e221be7..5ea9531 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -611,12 +611,6 @@ static void lockdep_print_held_locks(struct task_struct *p)
 	else
 		printk("%d lock%s held by %s/%d:\n", depth,
 		       depth > 1 ? "s" : "", p->comm, task_pid_nr(p));
-	/*
-	 * It's not reliable to print a task's held locks if it's not sleeping
-	 * and it's not the current task.
-	 */
-	if (p->state == TASK_RUNNING && p != current)
-		return;
 	for (i = 0; i < depth; i++) {
 		printk(" #%d: ", i);
 		print_lock(p->held_locks + i);
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 02ca827..95022a9 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -3322,3 +3322,19 @@ void kmsg_dump_rewind(struct kmsg_dumper *dumper)
 EXPORT_SYMBOL_GPL(kmsg_dump_rewind);
 
 #endif
+
+#include <linux/kthread.h>
+static int ping_printk(void *unused)
+{
+	while (true) {
+		pr_info("kernel is alive.\n");
+		schedule_timeout_idle(10 * HZ);
+	}
+	return 0;
+}
+static int __init ping_printk_init(void)
+{
+	kthread_run(ping_printk, NULL, "ping_printk");
+	return 0;
+}
+late_initcall(ping_printk_init);