hotspot/test/runtime/ErrorHandling/TimeoutInErrorHandlingTest.java
author stuefe
Thu, 23 Feb 2017 15:59:14 -0500
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8166944: Hanging Error Reporting steps may lead to torn error logs. Summary: Interupt error reporting if reporting steps hang to enable subsequent reporting steps to run. Reviewed-by: cjplummer, dholmes
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/*
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 * Copyright (c) 2017, 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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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.InputStreamReader;
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import java.util.regex.Pattern;
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.Platform;
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import jdk.test.lib.process.ProcessTools;
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/*
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 * @test
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 * @bug 8166944
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 * @summary Hanging Error Reporting steps may lead to torn error logs
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 * @modules java.base/jdk.internal.misc
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 * @library /test/lib
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 * @requires (vm.debug == true) & (os.family != "windows")
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 * @author Thomas Stuefe (SAP)
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 */
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public class TimeoutInErrorHandlingTest {
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    public static void main(String[] args) throws Exception {
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        /* Start the VM and let it crash. Specify TestUnresponsiveErrorHandler which will
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         * let five subsequent error reporting steps hang. The Timeout handling triggered
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         * by the WatcherThread should kick in and interrupt those steps. In theory, the
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         * text "timeout occurred during error reporting in step .." (the little timeouts)
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         * should occur in the error log up to four times, followed by the final big timeout
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         * "------ Timeout during error reporting after xx s. ------"
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         *
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         * Note that there are a number of uncertainties which make writing a 100% foolproof
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         * test challenging. The time the error reporting thread takes to react to the
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         * timeout triggers is unknown. So it is difficult to predict how many little timeouts
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         * will be visible before the big timeout kicks in. Also, once the big timeout hits,
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         * error reporting thread and Watcherthread will race. The former writes his last
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         * message to the error logs and flushes, the latter waits 200ms and then exits the
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         * process without further synchronization with the error reporting thread.
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         *
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         * Because of all this and the desire to write a bullet proof test which does
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         * not fail sporadically, we will not test for the final timeout message nor for all
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         * of the optimally expected little timeout messages. We just test for two of the
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         * little timeout messages to see that repeated timeout handling is basically working.
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         */
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        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
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            "-XX:+UnlockDiagnosticVMOptions",
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            "-Xmx100M",
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            "-XX:ErrorHandlerTest=14",
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            "-XX:+TestUnresponsiveErrorHandler",
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            "-XX:ErrorLogTimeout=16", // 16 seconds big timeout = 4 seconds per little timeout
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            "-XX:-CreateCoredumpOnCrash",
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            "-version");
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        OutputAnalyzer output_detail = new OutputAnalyzer(pb.start());
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        // we should have crashed with a SIGSEGV
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        output_detail.shouldMatch("# A fatal error has been detected by the Java Runtime Environment:.*");
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        output_detail.shouldMatch("# +(?:SIGSEGV|EXCEPTION_ACCESS_VIOLATION).*");
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        // VM should have been aborted by WatcherThread
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        output_detail.shouldMatch(".*timer expired, abort.*");
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        // extract hs-err file
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        String hs_err_file = output_detail.firstMatch("# *(\\S*hs_err_pid\\d+\\.log)", 1);
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        if (hs_err_file == null) {
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            throw new RuntimeException("Did not find hs-err file in output.\n");
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        }
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        File f = new File(hs_err_file);
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        if (!f.exists()) {
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            throw new RuntimeException("hs-err file missing at "
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                + f.getAbsolutePath() + ".\n");
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        }
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        System.out.println("Found hs_err file. Scanning...");
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        FileInputStream fis = new FileInputStream(f);
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        BufferedReader br = new BufferedReader(new InputStreamReader(fis));
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        String line = null;
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        Pattern [] pattern = new Pattern[] {
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            Pattern.compile(".*timeout occurred during error reporting in step.*"),
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            Pattern.compile(".*timeout occurred during error reporting in step.*")
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        };
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        int currentPattern = 0;
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        String lastLine = null;
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        while ((line = br.readLine()) != null) {
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            if (currentPattern < pattern.length) {
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              if (pattern[currentPattern].matcher(line).matches()) {
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                System.out.println("Found: " + line + ".");
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                currentPattern ++;
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              }
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            }
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            lastLine = line;
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        }
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        br.close();
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        if (currentPattern < pattern.length) {
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            throw new RuntimeException("hs-err file incomplete (first missing pattern: " +  currentPattern + ")");
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        }
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        System.out.println("OK.");
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    }
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}
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