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Datei: TestDumpOnCrash.java Sprache: JAVA

/*
* Copyright (c) 2016, 2022, 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.
*/
package jdk.jfr.jvm;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

import jdk.internal.misc.Unsafe;
import jdk.jfr.consumer.RecordedEvent;
import jdk.jfr.consumer.RecordingFile;
import jdk.test.lib.Asserts;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

/**
* @test
* @key jfr
* @summary Verifies that data associated with a running recording can be evacuated to an hs_err_pidXXX.jfr when the VM crashes
* @requires vm.hasJFR
*
* @library /test/lib
* @modules java.base/jdk.internal.misc
*          java.management
*          jdk.jfr
*
* @run main/othervm --add-exports=java.base/jdk.internal.misc=ALL-UNNAMED jdk.jfr.jvm.TestDumpOnCrash
*/
public class TestDumpOnCrash {

    private static final int ATTEMPTS = 3;

    static class CrasherIllegalAccess {
        public static void main(String[] args) {
            Unsafe.getUnsafe().putInt(0L, 0);
        }
    }

    static class CrasherHalt {
        public static void main(String[] args) {
            System.out.println("Running Runtime.getRuntime.halt");
            Runtime.getRuntime().halt(17);
        }
    }

    static class CrasherSig {
        public static void main(String[] args) throws Exception {
            String signalName = args[0];
            System.out.println("Sending SIG" + signalName + " to process " + ProcessHandle.current().pid());
            Runtime.getRuntime().exec("kill -" + signalName + " " + ProcessHandle.current().pid()).waitFor();
        }
    }

    public static void main(String[] args) throws Exception {
        // Test without dumppath
        test(CrasherIllegalAccess.class, "", true, null, true);
        test(CrasherIllegalAccess.class, "", false, null, true);

        // JDK-8290020 disables dumps when calling halt, so expect no dump.
        test(CrasherHalt.class, "", true, null, false);
        test(CrasherHalt.class, "", false, null, false);

        // Test with dumppath
        Path dumppath = Files.createTempDirectory(null);
        try {
            test(CrasherIllegalAccess.class, "", true, dumppath.toString(), true);
            test(CrasherIllegalAccess.class, "", false, dumppath.toString(), true);
        } finally {
            dumppath.toFile().delete();
        }

        // Test is excluded until 8219680 is fixed
        // @ignore 8219680
        // test(CrasherSig.class, "FPE", true, true);
    }

    private static void test(Class<?> crasher, String signal, boolean disk, String dumppath, boolean expectDump) throws Exception {
        // The JVM may be in a state it can't recover from, so try three times
        // before concluding functionality is not working.
        for (int attempt = 0; attempt < ATTEMPTS; attempt++) {
            try {
                verify(runProcess(crasher, signal, disk, dumppath), dumppath, expectDump);
                return;
            } catch (Exception e) {
                System.out.println("Attempt " + attempt + ". Verification failed:");
                System.out.println(e.getMessage());
                System.out.println("Retrying...");
                System.out.println();
            } catch (OutOfMemoryError | StackOverflowError e) {
                // Could happen if file is corrupt and parser loops or
                // tries to allocate more memory than what is available
                return;
            }
        }
        throw new Exception(ATTEMPTS + " attempts with failure!");
    }

    private static long runProcess(Class<?> crasher, String signal, boolean disk, String dumppath) throws Exception {
        System.out.println("Test case for crasher " + crasher.getName());
        List<String> options = new ArrayList<>();
        options.add("-Xmx64m");
        options.add("-XX:-CreateCoredumpOnCrash");
        options.add("-XX:-TieredCompilation"); // Avoid secondary crashes (see JDK-8293166)
        options.add("--add-exports=java.base/jdk.internal.misc=ALL-UNNAMED");
        options.add("-XX:StartFlightRecording:dumponexit=true,disk=" + Boolean.toString(disk));
        if (dumppath != null) {
            options.add("-XX:FlightRecorderOptions=dumppath=" + dumppath);
        }
        options.add(crasher.getName());
        options.add(signal);
        Process p = ProcessTools.createTestJvm(options).start();

        OutputAnalyzer output = new OutputAnalyzer(p);
        System.out.println("========== Crasher process output:");
        System.out.println(output.getOutput());
        System.out.println("==================================");

        return p.pid();
    }

    private static void verify(long pid, String dumppath, boolean expectDump) throws IOException {
        String fileName = "hs_err_pid" + pid + ".jfr";
        Path file = (dumppath == null) ? Paths.get(fileName) : Paths.get(dumppath, fileName);
        file = file.toAbsolutePath().normalize();

        if (expectDump) {
            Asserts.assertTrue(Files.exists(file), "No emergency jfr recording file " + file + " exists");
            Asserts.assertNotEquals(Files.size(file), 0L, "File length 0. Should at least be some bytes");
            System.out.printf("File size=%d%n", Files.size(file));

            List<RecordedEvent> events = RecordingFile.readAllEvents(file);
            Asserts.assertFalse(events.isEmpty(), "No event found");
            System.out.printf("Found event %s%n", events.get(0).getEventType().getName());

            Files.delete(file);
        } else {
            Asserts.assertFalse(Files.exists(file), "Emergency jfr recording file " + file + " exists but wasn't expected");
        }
    }
}

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