--- /dev/null	2018-11-30 10:10:44.238550338 +0100
+++ new/test/hotspot/jtreg/gc/libCriticalNative.c	2018-11-30 21:06:54.071062343 +0100
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2018, Red Hat, Inc. and/or its affiliates.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "jni.h"
+
+JNIEXPORT jlong JNICALL JavaCritical_CriticalNativeStress_sum1
+  (jint length, jlong* a) {
+  jlong sum = 0;
+  jint index;
+  for (index = 0; index < length; index ++) {
+    sum += a[index];
+  }
+
+  return sum;
+}
+
+JNIEXPORT jlong JNICALL  JavaCritical_CriticalNativeStress_sum2
+  (jlong a1, jint a2_length, jint* a2, jint a4_length, jint* a4, jint a6_length, jlong* a6, jint a8_length, jint* a8) {
+  jlong sum = a1;
+  jint index;
+  for (index = 0; index < a2_length; index ++) {
+    sum += a2[index];
+  }
+
+  for (index = 0; index < a4_length; index ++) {
+    sum += a4[index];
+  }
+
+  for (index = 0; index < a6_length; index ++) {
+    sum += a6[index];
+  }
+
+  for (index = 0; index < a8_length; index ++) {
+    sum += a8[index];
+  }
+  return sum;
+}
+
+JNIEXPORT jlong JNICALL Java_CriticalNativeStress_sum1
+  (JNIEnv *env, jclass jclazz, jlongArray a) {
+  jlong sum = 0;
+  jsize len = (*env)->GetArrayLength(env, a);
+  jsize index;
+  jlong* arr = (jlong*)(*env)->GetPrimitiveArrayCritical(env, a, 0);
+  for (index = 0; index < len; index ++) {
+    sum += arr[index];
+  }
+
+  (*env)->ReleasePrimitiveArrayCritical(env, a, arr, 0);
+  return sum;
+}
+
+JNIEXPORT jlong JNICALL Java_CriticalNativeStress_sum2
+  (JNIEnv *env, jclass jclazz, jlong a1, jintArray a2, jintArray a3, jlongArray a4, jintArray a5) {
+  jlong sum = a1;
+  jsize index;
+  jsize len;
+  jint* a2_arr;
+  jint* a3_arr;
+  jlong* a4_arr;
+  jint* a5_arr;
+
+  len = (*env)->GetArrayLength(env, a2);
+  a2_arr = (jint*)(*env)->GetPrimitiveArrayCritical(env, a2, 0);
+  for (index = 0; index < len; index ++) {
+    sum += a2_arr[index];
+  }
+  (*env)->ReleasePrimitiveArrayCritical(env, a2, a2_arr, 0);
+
+  len = (*env)->GetArrayLength(env, a3);
+  a3_arr = (jint*)(*env)->GetPrimitiveArrayCritical(env, a3, 0);
+  for (index = 0; index < len; index ++) {
+    sum += a3_arr[index];
+  }
+  (*env)->ReleasePrimitiveArrayCritical(env, a3, a3_arr, 0);
+
+  len = (*env)->GetArrayLength(env, a4);
+  a4_arr = (jlong*)(*env)->GetPrimitiveArrayCritical(env, a4, 0);
+  for (index = 0; index < len; index ++) {
+    sum += a4_arr[index];
+  }
+  (*env)->ReleasePrimitiveArrayCritical(env, a4, a4_arr, 0);
+
+  len = (*env)->GetArrayLength(env, a5);
+  a5_arr = (jint*)(*env)->GetPrimitiveArrayCritical(env, a5, 0);
+  for (index = 0; index < len; index ++) {
+    sum += a5_arr[index];
+  }
+  (*env)->ReleasePrimitiveArrayCritical(env, a5, a5_arr, 0);
+
+  return sum;
+}
+
+
+JNIEXPORT jboolean JNICALL JavaCritical_CriticalNativeArgs_isNull
+  (jint length, jint* a) {
+  return (a == NULL) && (length == 0);
+}
+
+JNIEXPORT jboolean JNICALL Java_CriticalNativeArgs_isNull
+  (JNIEnv *env, jclass jclazz, jintArray a) {
+  jboolean is_null;
+  jsize len = (*env)->GetArrayLength(env, a);
+  jint* arr = (jint*)(*env)->GetPrimitiveArrayCritical(env, a, 0);
+  is_null = (arr == NULL) && (len == 0);
+  (*env)->ReleasePrimitiveArrayCritical(env, a, arr, 0);
+  return is_null;
+}
+