231 lines
10 KiB
Java
231 lines
10 KiB
Java
/*
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* Copyright (c) 2016, 2023, 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 8140520
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* @summary Setting small CompilerThreadStackSize, ThreadStackSize, and
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* VMThreadStackSize values should result in an error message that shows
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* the minimum stack size value for each thread type.
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @run driver 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
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* stack smaller than the minimum without crashing. Also this test will
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* determine the minimum allowed stack size for the platform (as
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* provided by the JVM error message when a very small stack is used),
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* and then verify that the JVM can be launched with that stack size
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* 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 '-XX:ThreadStackSize' VM option. The jdk repo's version
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* of the test exercises the '-Xss' option.
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*/
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.lib.process.OutputAnalyzer;
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public class TooSmallStackSize {
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/* for debugging. Normally false. */
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static final boolean verbose = false;
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static final String CompilerThreadStackSizeString = "CompilerThreadStackSize";
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static final String ThreadStackSizeString = "Java thread stack size";
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static final String VMThreadStackSizeString = "VMThreadStackSize";
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static String testShadowSize = null;
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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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* stack size was used.
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*
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* The testOutput 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(String testOutput) {
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/*
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* The JVM output will contain in one of the lines:
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* "The CompilerThreadStackSize specified is too small. Specify at least 100k"
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* "The Java thread stack size specified is too small. Specify at least 100k"
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* "The VMThreadStackSize 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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int match_idx = testOutput.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 = testOutput.indexOf("k", size_start_idx);
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// don't include the 'k'; the caller will have to
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// add it back as needed.
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return testOutput.substring(size_start_idx, k_start_idx);
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}
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System.out.println("Expect='" + matchStr + "'");
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System.out.println("Actual: " + testOutput);
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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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static ProcessBuilder createProcessWithOptions(String stackOption, String stackSize) throws Exception {
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if (testShadowSize == null) {
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return ProcessTools.createLimitedTestJavaProcessBuilder(
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stackOption + stackSize,
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// Uncomment the following to get log output
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// that shows actual thread creation sizes.
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// "-Xlog:os+thread",
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"-version");
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} else {
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return ProcessTools.createLimitedTestJavaProcessBuilder(
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stackOption + stackSize,
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// Uncomment the following to get log output
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// that shows actual thread creation sizes.
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// "-Xlog:os+thread",
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"-XX:StackShadowPages=" + testShadowSize,
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"-version");
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}
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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 stackOption, String optionMesg, String stackSize) throws Exception {
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String min_stack_allowed;
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System.out.println("*** Testing " + stackOption + stackSize);
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ProcessBuilder pb = createProcessWithOptions(stackOption, stackSize);
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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if (verbose) {
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System.out.println("stdout: " + output.getStdout());
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}
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if (output.getExitValue() == 0) {
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// checkMinStackAllowed() is called with stackSize values
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// that should be the minimum that works. This method,
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// checkStack(), is called with stackSize values that
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// should be too small and result in error messages.
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// However, some platforms fix up a stackSize value that is
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// too small into something that works so we have to allow
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// for checkStack() calls that work.
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System.out.println("PASSED: got exit_code == 0 with " + stackOption + stackSize);
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min_stack_allowed = stackSize;
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} else {
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String expect = "The " + optionMesg + " specified is too small";
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if (verbose) {
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System.out.println("Expect='" + expect + "'");
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}
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output.shouldContain(expect);
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min_stack_allowed = getMinStackAllowed(output.getStdout());
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System.out.println("PASSED: got expected error message with " + stackOption + stackSize);
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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 stackOption, String optionMesg, String stackSize) throws Exception {
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System.out.println("*** Testing " + stackOption + stackSize);
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ProcessBuilder pb = createProcessWithOptions(stackOption, stackSize);
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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output.shouldHaveExitValue(0);
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System.out.println("PASSED: VM launched with " + stackOption + stackSize);
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}
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public static void test(String... args) throws Exception {
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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("-XX:ThreadStackSize=", ThreadStackSizeString, "16");
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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("-XX:ThreadStackSize=", ThreadStackSizeString, "64");
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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("-XX:ThreadStackSize=", ThreadStackSizeString, min_stack_allowed);
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/*
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* Now try with a stack size that is not page aligned.
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*/
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checkMinStackAllowed("-XX:ThreadStackSize=", ThreadStackSizeString, "513");
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/*
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* Try with 0k which indicates that the default thread stack size from JVM will be used.
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*/
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checkMinStackAllowed("-XX:ThreadStackSize=", ThreadStackSizeString, "0");
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/*
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* Now redo the same tests with the compiler thread stack size:
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*/
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checkStack("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, "16");
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min_stack_allowed = checkStack("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, "64");
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checkMinStackAllowed("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, min_stack_allowed);
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checkMinStackAllowed("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, "513");
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checkMinStackAllowed("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, "0");
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/*
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* Now redo the same tests with the VM thread stack size:
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*/
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checkStack("-XX:VMThreadStackSize=", VMThreadStackSizeString, "16");
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min_stack_allowed = checkStack("-XX:VMThreadStackSize=", VMThreadStackSizeString, "64");
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checkMinStackAllowed("-XX:VMThreadStackSize=", VMThreadStackSizeString, min_stack_allowed);
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checkMinStackAllowed("-XX:VMThreadStackSize=", VMThreadStackSizeString, "513");
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checkMinStackAllowed("-XX:VMThreadStackSize=", VMThreadStackSizeString, "0");
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}
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// aarch64 StackShadowPage size range is 25-55
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static String shadowSizes[] = { null, "30" };
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public static void main(java.lang.String[] unused) throws Exception {
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for (String sz : shadowSizes) {
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testShadowSize = sz;
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test();
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}
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}
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}
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