diff --git a/arch/x86_64/kernel/syscall.c b/arch/x86_64/kernel/syscall.c
index 4b2742b..a3173c9 100644
--- a/arch/x86_64/kernel/syscall.c
+++ b/arch/x86_64/kernel/syscall.c
@@ -1670,6 +1670,11 @@ long do_arch_prctl(unsigned long code, unsigned long address)
 			break;
 		case ARCH_SET_GS:
 			return -ENOTSUPP;
+		case 999: {
+			struct thread *thread = cpu_local_var(current);
+			thread->proc->dblsig = (int)address;
+			return 0;
+		}
 		default:
 			return -EINVAL;
 	}
diff --git a/kernel/include/process.h b/kernel/include/process.h
index 24acf1f..dd94469 100644
--- a/kernel/include/process.h
+++ b/kernel/include/process.h
@@ -580,6 +580,8 @@ struct process {
 #endif // PROFILE_ENABLE
 	int nr_processes; /* For partitioned execution */
 	int process_rank; /* Rank in partition */
+
+	int dblsig;
 };
 
 /*
diff --git a/kernel/syscall.c b/kernel/syscall.c
index 15d4593..3d03fad 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -9632,6 +9632,15 @@ long syscall(int num, ihk_mc_user_context_t *ctx)
 
 	if (!list_empty(&thread->sigpending) ||
 	    !list_empty(&thread->sigcommon->sigpending)) {
+		if (!list_empty(&thread->sigcommon->sigpending) &&
+		    thread->proc->dblsig) {
+			kprintf("have a signal, waiting arrive more signal\n");
+			while (list_is_singular(
+					      &thread->sigcommon->sigpending)) {
+				schedule();
+			}
+			kprintf("have some signals\n");
+		}
 		check_signal(l, NULL, num);
 	}