diff --git a/executer/kernel/mcctrl/control.c b/executer/kernel/mcctrl/control.c
index bf452753..d32732e9 100644
--- a/executer/kernel/mcctrl/control.c
+++ b/executer/kernel/mcctrl/control.c
@@ -1099,6 +1099,7 @@ void mcctrl_put_per_proc_data(struct mcctrl_per_proc_data *ppd)
 		struct mcctrl_per_thread_data *ptd;
 		struct mcctrl_per_thread_data *next;
 
+		write_lock_irqsave(&ppd->per_thread_data_hash_lock[i], flags);
 		list_for_each_entry_safe(ptd, next,
 		                         ppd->per_thread_data_hash + i, hash) {
 			packet = ptd->data;
@@ -1114,6 +1115,7 @@ void mcctrl_put_per_proc_data(struct mcctrl_per_proc_data *ppd)
 					 ppd->ud->ikc2linux[smp_processor_id()] :
 					 ppd->ud->ikc2linux[0]));
 		}
+		write_unlock_irqrestore(&ppd->per_thread_data_hash_lock[i], flags);
 	}
 
 	flags = ihk_ikc_spinlock_lock(&ppd->wq_list_lock);