--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/tools/launcher/TooSmallStackSize.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,175 @@
+/*
+ * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * 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.
+ */
+
+/*
+ * @test
+ * @bug 6762191
+ * @summary Setting stack size to 16K causes segmentation fault
+ * @compile TooSmallStackSize.java
+ * @run main TooSmallStackSize
+ */
+
+/*
+ * The primary purpose of this test is to make sure we can run with a 16k stack
+ * size without crashing. Also this test will determine the minimum allowed
+ * stack size for the platform (as provided by the JVM error message when a very
+ * small stack is used), and then verify that the JVM can be launched with that stack
+ * size without a crash or any error messages.
+ *
+ * Note: The '-Xss<size>' and '-XX:ThreadStackSize=<k-bytes>' options
+ * both control Java thread stack size. This repo's version of the test
+ * exercises the '-Xss' option. The hotspot repo's version of the test
+ * exercises the '-XX:ThreadStackSize' VM option.
+ */
+
+public class TooSmallStackSize extends TestHelper {
+ /* for debugging. Normally false. */
+ static final boolean verbose = false;
+
+ static void printTestOutput(TestResult tr) {
+ System.out.println("*** exitValue = " + tr.exitValue);
+ for (String x : tr.testOutput) {
+ System.out.println(x);
+ }
+ }
+
+ /*
+ * Returns the minimum stack size this platform will allowed based on the
+ * contents of the error message the JVM outputs when too small of a
+ * -Xss size was used.
+ *
+ * The TestResult argument must contain the result of having already run
+ * the JVM with too small of a stack size.
+ */
+ static String getMinStackAllowed(TestResult tr) {
+ /*
+ * The JVM output will contain in one of the lines:
+ * "The Java thread stack size specified is too small. Specify at least 100k"
+ * Although the actual size will vary. We need to extract this size
+ * string from the output and return it.
+ */
+ String matchStr = "Specify at least ";
+ for (String x : tr.testOutput) {
+ int match_idx = x.indexOf(matchStr);
+ if (match_idx >= 0) {
+ int size_start_idx = match_idx + matchStr.length();
+ int k_start_idx = x.indexOf("k", size_start_idx);
+ return x.substring(size_start_idx, k_start_idx + 1); // include the "k"
+ }
+ }
+
+ System.out.println("Expect='" + matchStr + "'");
+ System.out.println("Actual:");
+ printTestOutput(tr);
+ System.out.println("FAILED: Could not get the stack size from the output");
+ throw new RuntimeException("test fails");
+ }
+
+ /*
+ * Run the JVM with the specified stack size.
+ *
+ * Returns the minimum allowed stack size gleaned from the error message,
+ * if there is an error message. Otherwise returns the stack size passed in.
+ */
+ static String checkStack(String stackSize) {
+ String min_stack_allowed;
+
+ if (verbose)
+ System.out.println("*** Testing " + stackSize);
+ TestResult tr = doExec(javaCmd, "-Xss" + stackSize, "-version");
+ if (verbose)
+ printTestOutput(tr);
+
+ if (tr.isOK()) {
+ System.out.println("PASSED: got no error message with stack size of " + stackSize);
+ min_stack_allowed = stackSize;
+ } else {
+ String matchStr = "The Java thread stack size specified is too small";
+ if (tr.contains(matchStr)) {
+ System.out.println("PASSED: got expected error message with stack size of " + stackSize);
+ min_stack_allowed = getMinStackAllowed(tr);
+ } else {
+ // Likely a crash
+ System.out.println("Expect='" + matchStr + "'");
+ System.out.println("Actual:");
+ printTestOutput(tr);
+ System.out.println("FAILED: Did not get expected error message with stack size of " + stackSize);
+ throw new RuntimeException("test fails");
+ }
+ }
+
+ return min_stack_allowed;
+ }
+
+ /*
+ * Run the JVM with the minimum allowed stack size. This should always succeed.
+ */
+ static void checkMinStackAllowed(String stackSize) {
+ if (verbose)
+ System.out.println("*** Testing " + stackSize);
+ TestResult tr = doExec(javaCmd, "-Xss" + stackSize, "-version");
+ if (verbose)
+ printTestOutput(tr);
+
+ if (tr.isOK()) {
+ System.out.println("PASSED: VM launched with minimum allowed stack size of " + stackSize);
+ } else {
+ // Likely a crash
+ System.out.println("Test output:");
+ printTestOutput(tr);
+ System.out.println("FAILED: VM failed to launch with minimum allowed stack size of " + stackSize);
+ throw new RuntimeException("test fails");
+ }
+ }
+
+ public static void main(String... args) {
+ /*
+ * The result of a 16k stack size should be a quick exit with a complaint
+ * that the stack size is too small. However, for some win32 builds, the
+ * stack is always at least 64k, and this also sometimes is the minimum
+ * allowed size, so we won't see an error in this case.
+ *
+ * This test case will also produce a crash on some platforms if the fix
+ * for 6762191 is not yet in place.
+ */
+ checkStack("16k");
+
+ /*
+ * Try with a 64k stack size, which is the size that the launcher will
+ * set to if you try setting to anything smaller. This should produce the same
+ * result as setting to 16k if the fix for 6762191 is in place.
+ */
+ String min_stack_allowed = checkStack("64k");
+
+ /*
+ * Try again with a the minimum stack size that was given in the error message
+ */
+ checkMinStackAllowed(min_stack_allowed);
+
+ /*
+ * Try again with a size that is not OS page aligned. This is to help test that
+ * asserts added for 8176768 are not triggered.
+ */
+ checkMinStackAllowed("513k");
+ }
+}