--- /dev/null 2014-06-09 12:21:43.350018041 -0700 +++ new/test/tools/launcher/TooSmallStackSize.java 2014-12-03 23:53:05.000000000 -0800 @@ -0,0 +1,158 @@ +/* + * Copyright (c) 2014, 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. + */ + +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 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("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; + TestResult tr; + + if (verbose) + System.out.println("*** Testing " + stackSize); + 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 { + if (tr.contains("The stack size specified is too small")) { + 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("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) { + TestResult tr = null; + + if (verbose) + System.out.println("*** Testing " + stackSize); + 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("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 32k 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("32k"); + + /* + * Try again with a the minimum stack size that was given in the error message + */ + checkMinStackAllowed(min_stack_allowed); + } +}