182 lines
7.1 KiB
Java
182 lines
7.1 KiB
Java
/*
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* Copyright (c) 2014, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6762191 8222334
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* @summary Setting stack size to 16K causes segmentation fault
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* @compile TooSmallStackSize.java
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* @run main TooSmallStackSize
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*/
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/*
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* The primary purpose of this test is to make sure we can run with a 16k stack
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* size without crashing. Also this test will determine the minimum allowed
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* stack size for the platform (as provided by the JVM error message when a very
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* small stack is used), and then verify that the JVM can be launched with that stack
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* size without a crash or any error messages.
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*
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* Note: The '-Xss<size>' and '-XX:ThreadStackSize=<k-bytes>' options
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* both control Java thread stack size. This repo's version of the test
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* exercises the '-Xss' option. The hotspot repo's version of the test
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* exercises the '-XX:ThreadStackSize' VM option.
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*/
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public class TooSmallStackSize extends TestHelper {
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/* for debugging. Normally false. */
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static final boolean verbose = false;
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static void printTestOutput(TestResult tr) {
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System.out.println("*** exitValue = " + tr.exitValue);
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for (String x : tr.testOutput) {
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System.out.println(x);
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}
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}
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/*
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* Returns the minimum stack size this platform will allowed based on the
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* contents of the error message the JVM outputs when too small of a
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* -Xss size was used.
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*
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* The TestResult argument must contain the result of having already run
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* the JVM with too small of a stack size.
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*/
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static String getMinStackAllowed(TestResult tr) {
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/*
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* The JVM output will contain in one of the lines:
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* "The Java thread stack size specified is too small. Specify at least 100k"
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* Although the actual size will vary. We need to extract this size
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* string from the output and return it.
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*/
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String matchStr = "Specify at least ";
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for (String x : tr.testOutput) {
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int match_idx = x.indexOf(matchStr);
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if (match_idx >= 0) {
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int size_start_idx = match_idx + matchStr.length();
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int k_start_idx = x.indexOf("k", size_start_idx);
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return x.substring(size_start_idx, k_start_idx + 1); // include the "k"
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}
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}
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System.out.println("Expect='" + matchStr + "'");
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System.out.println("Actual:");
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printTestOutput(tr);
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System.out.println("FAILED: Could not get the stack size from the output");
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throw new RuntimeException("test fails");
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}
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/*
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* Run the JVM with the specified stack size.
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*
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* Returns the minimum allowed stack size gleaned from the error message,
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* if there is an error message. Otherwise returns the stack size passed in.
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*/
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static String checkStack(String stackSize) {
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String min_stack_allowed;
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if (verbose)
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System.out.println("*** Testing " + stackSize);
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TestResult tr = doExec(javaCmd, "-Xss" + stackSize, "-version");
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if (verbose)
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printTestOutput(tr);
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if (tr.isOK()) {
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System.out.println("PASSED: got no error message with stack size of " + stackSize);
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min_stack_allowed = stackSize;
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} else {
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String matchStr = "The Java thread stack size specified is too small";
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if (tr.contains(matchStr)) {
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System.out.println("PASSED: got expected error message with stack size of " + stackSize);
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min_stack_allowed = getMinStackAllowed(tr);
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} else {
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// Likely a crash
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System.out.println("Expect='" + matchStr + "'");
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System.out.println("Actual:");
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printTestOutput(tr);
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System.out.println("FAILED: Did not get expected error message with stack size of " + stackSize);
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throw new RuntimeException("test fails");
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}
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}
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return min_stack_allowed;
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}
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/*
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* Run the JVM with the minimum allowed stack size. This should always succeed.
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*/
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static void checkMinStackAllowed(String stackSize) {
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if (verbose)
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System.out.println("*** Testing " + stackSize);
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TestResult tr = doExec(javaCmd, "-Xss" + stackSize, "-version");
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if (verbose)
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printTestOutput(tr);
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if (tr.isOK()) {
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System.out.println("PASSED: VM launched with minimum allowed stack size of " + stackSize);
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} else {
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// Likely a crash
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System.out.println("Test output:");
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printTestOutput(tr);
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System.out.println("FAILED: VM failed to launch with minimum allowed stack size of " + stackSize);
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throw new RuntimeException("test fails");
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}
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}
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public static void main(String... args) {
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/*
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* The result of a 16k stack size should be a quick exit with a complaint
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* that the stack size is too small. However, for some win32 builds, the
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* stack is always at least 64k, and this also sometimes is the minimum
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* allowed size, so we won't see an error in this case.
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*
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* This test case will also produce a crash on some platforms if the fix
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* for 6762191 is not yet in place.
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*/
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checkStack("16k");
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/*
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* Try with a 64k stack size, which is the size that the launcher will
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* set to if you try setting to anything smaller. This should produce the same
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* result as setting to 16k if the fix for 6762191 is in place.
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*/
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String min_stack_allowed = checkStack("64k");
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/*
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* Try again with the minimum stack size that was given in the error message
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*/
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checkMinStackAllowed(min_stack_allowed);
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/*
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* Try again with a size that is not OS page aligned. This is to help test that
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* asserts added for 8176768 are not triggered.
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*/
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checkMinStackAllowed("513k");
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/*
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* Try with 0k which indicates that the default thread stack size either from JVM or system
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* will be used, this should always succeed.
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*/
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checkMinStackAllowed("0k");
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}
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}
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