| /* |
| * 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"); |
| } |
| } |