--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/runtime/Thread/TooSmallStackSize.java Fri Sep 09 11:14:57 2016 -0700
@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2016, 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 8140520
+ * @summary Setting small CompilerThreadStackSize, ThreadStackSize, and
+ * VMThreadStackSize values should result in an error message that shows
+ * the minimum stack size value for each thread type.
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * java.management
+ * @run main TooSmallStackSize
+ */
+
+/*
+ * The primary purpose of this test is to make sure we can run with a
+ * stack smaller than the minimum 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 '-XX:ThreadStackSize' VM option. The jdk repo's version
+ * of the test exercises the '-Xss' option.
+ */
+
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.process.OutputAnalyzer;
+
+public class TooSmallStackSize {
+ /* for debugging. Normally false. */
+ static final boolean verbose = false;
+ static final String CompilerThreadStackSizeString = "CompilerThreadStackSize";
+ static final String ThreadStackSizeString = "Java thread stack size";
+ static final String VMThreadStackSizeString = "VMThreadStackSize";
+
+ /*
+ * 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
+ * stack size was used.
+ *
+ * The testOutput argument must contain the result of having already run
+ * the JVM with too small of a stack size.
+ */
+ static String getMinStackAllowed(String testOutput) {
+ /*
+ * The JVM output will contain in one of the lines:
+ * "The CompilerThreadStackSize specified is too small. Specify at least 100k"
+ * "The Java thread stack size specified is too small. Specify at least 100k"
+ * "The VMThreadStackSize 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 ";
+ int match_idx = testOutput.indexOf(matchStr);
+ if (match_idx >= 0) {
+ int size_start_idx = match_idx + matchStr.length();
+ int k_start_idx = testOutput.indexOf("k", size_start_idx);
+ // don't include the 'k'; the caller will have to
+ // add it back as needed.
+ return testOutput.substring(size_start_idx, k_start_idx);
+ }
+
+ System.out.println("Expect='" + matchStr + "'");
+ System.out.println("Actual: " + testOutput);
+ 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 stackOption, String optionMesg, String stackSize) throws Exception {
+ String min_stack_allowed;
+
+ System.out.println("*** Testing " + stackOption + stackSize);
+
+ ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+ stackOption + stackSize,
+ // Uncomment the following to get log output
+ // that shows actual thread creation sizes.
+ // "-Xlog:os+thread",
+ "-version");
+
+ OutputAnalyzer output = new OutputAnalyzer(pb.start());
+
+ if (verbose) {
+ System.out.println("stdout: " + output.getStdout());
+ }
+
+ if (output.getExitValue() == 0) {
+ // checkMinStackAllowed() is called with stackSize values
+ // that should be the minimum that works. This method,
+ // checkStack(), is called with stackSize values that
+ // should be too small and result in error messages.
+ // However, some platforms fix up a stackSize value that is
+ // too small into something that works so we have to allow
+ // for checkStack() calls that work.
+ System.out.println("PASSED: got exit_code == 0 with " + stackOption + stackSize);
+ min_stack_allowed = stackSize;
+ } else {
+ String expect = "The " + optionMesg + " specified is too small";
+ if (verbose) {
+ System.out.println("Expect='" + expect + "'");
+ }
+ output.shouldContain(expect);
+ min_stack_allowed = getMinStackAllowed(output.getStdout());
+
+ System.out.println("PASSED: got expected error message with " + stackOption + stackSize);
+ }
+
+ return min_stack_allowed;
+ }
+
+ /*
+ * Run the JVM with the minimum allowed stack size. This should always succeed.
+ */
+ static void checkMinStackAllowed(String stackOption, String optionMesg, String stackSize) throws Exception {
+ System.out.println("*** Testing " + stackOption + stackSize);
+
+ ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+ stackOption + stackSize,
+ // Uncomment the following to get log output
+ // that shows actual thread creation sizes.
+ // "-Xlog:os+thread",
+ "-version");
+
+ OutputAnalyzer output = new OutputAnalyzer(pb.start());
+ output.shouldHaveExitValue(0);
+
+ System.out.println("PASSED: VM launched with " + stackOption + stackSize);
+ }
+
+ public static void main(String... args) throws Exception {
+ /*
+ * 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("-XX:ThreadStackSize=", ThreadStackSizeString, "16");
+
+ /*
+ * 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("-XX:ThreadStackSize=", ThreadStackSizeString, "32");
+
+ /*
+ * Try again with a the minimum stack size that was given in the error message
+ */
+ checkMinStackAllowed("-XX:ThreadStackSize=", ThreadStackSizeString, min_stack_allowed);
+
+ /*
+ * Now redo the same tests with the compiler thread stack size:
+ */
+ checkStack("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, "16");
+ min_stack_allowed = checkStack("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, "32");
+ checkMinStackAllowed("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, min_stack_allowed);
+
+ /*
+ * Now redo the same tests with the VM thread stack size:
+ */
+ checkStack("-XX:VMThreadStackSize=", VMThreadStackSizeString, "16");
+ min_stack_allowed = checkStack("-XX:VMThreadStackSize=", VMThreadStackSizeString, "32");
+ checkMinStackAllowed("-XX:VMThreadStackSize=", VMThreadStackSizeString, min_stack_allowed);
+ }
+}