Index: cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/speculation/tst.NoSpecBuffer.d
===================================================================
--- cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/speculation/tst.NoSpecBuffer.d
+++ cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/speculation/tst.NoSpecBuffer.d
@@ -39,6 +39,7 @@
 BEGIN
 {
 	i = 0;
+	notused = $1;
 }
 
 syscall::open:entry
Index: cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/speculation/tst.NoSpecBuffer.exe
===================================================================
--- /dev/null
+++ cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/speculation/tst.NoSpecBuffer.exe
@@ -0,0 +1,30 @@
+#!/usr/bin/env ksh
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright 2017 Li-Wen Hsu <lwhsu@FreeBSD.org>
+
+while true
+do
+	sleep 0.1
+	cat /etc/motd > /dev/null
+done
Index: cddl/usr.sbin/dtrace/tests/common/speculation/Makefile
===================================================================
--- cddl/usr.sbin/dtrace/tests/common/speculation/Makefile
+++ cddl/usr.sbin/dtrace/tests/common/speculation/Makefile
@@ -68,6 +68,7 @@
      tst.zerosize.d  \
 
 TESTEXES= \
+     tst.NoSpecBuffer.exe  \
 
 
 CFILES= \