--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/runtime/ErrorHandling/TimeoutInErrorHandlingTest.java	Thu Feb 23 15:59:14 2017 -0500
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.InputStreamReader;
+import java.util.regex.Pattern;
+
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.Platform;
+import jdk.test.lib.process.ProcessTools;
+
+/*
+ * @test
+ * @bug 8166944
+ * @summary Hanging Error Reporting steps may lead to torn error logs
+ * @modules java.base/jdk.internal.misc
+ * @library /test/lib
+ * @requires (vm.debug == true) & (os.family != "windows")
+ * @author Thomas Stuefe (SAP)
+ */
+
+public class TimeoutInErrorHandlingTest {
+
+
+    public static void main(String[] args) throws Exception {
+
+        /* Start the VM and let it crash. Specify TestUnresponsiveErrorHandler which will
+         * let five subsequent error reporting steps hang. The Timeout handling triggered
+         * by the WatcherThread should kick in and interrupt those steps. In theory, the
+         * text "timeout occurred during error reporting in step .." (the little timeouts)
+         * should occur in the error log up to four times, followed by the final big timeout
+         * "------ Timeout during error reporting after xx s. ------"
+         *
+         * Note that there are a number of uncertainties which make writing a 100% foolproof
+         * test challenging. The time the error reporting thread takes to react to the
+         * timeout triggers is unknown. So it is difficult to predict how many little timeouts
+         * will be visible before the big timeout kicks in. Also, once the big timeout hits,
+         * error reporting thread and Watcherthread will race. The former writes his last
+         * message to the error logs and flushes, the latter waits 200ms and then exits the
+         * process without further synchronization with the error reporting thread.
+         *
+         * Because of all this and the desire to write a bullet proof test which does
+         * not fail sporadically, we will not test for the final timeout message nor for all
+         * of the optimally expected little timeout messages. We just test for two of the
+         * little timeout messages to see that repeated timeout handling is basically working.
+         */
+
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+            "-XX:+UnlockDiagnosticVMOptions",
+            "-Xmx100M",
+            "-XX:ErrorHandlerTest=14",
+            "-XX:+TestUnresponsiveErrorHandler",
+            "-XX:ErrorLogTimeout=16", // 16 seconds big timeout = 4 seconds per little timeout
+            "-XX:-CreateCoredumpOnCrash",
+            "-version");
+
+        OutputAnalyzer output_detail = new OutputAnalyzer(pb.start());
+
+        // we should have crashed with a SIGSEGV
+        output_detail.shouldMatch("# A fatal error has been detected by the Java Runtime Environment:.*");
+        output_detail.shouldMatch("# +(?:SIGSEGV|EXCEPTION_ACCESS_VIOLATION).*");
+
+        // VM should have been aborted by WatcherThread
+        output_detail.shouldMatch(".*timer expired, abort.*");
+
+        // extract hs-err file
+        String hs_err_file = output_detail.firstMatch("# *(\\S*hs_err_pid\\d+\\.log)", 1);
+        if (hs_err_file == null) {
+            throw new RuntimeException("Did not find hs-err file in output.\n");
+        }
+
+        File f = new File(hs_err_file);
+        if (!f.exists()) {
+            throw new RuntimeException("hs-err file missing at "
+                + f.getAbsolutePath() + ".\n");
+        }
+
+        System.out.println("Found hs_err file. Scanning...");
+
+        FileInputStream fis = new FileInputStream(f);
+        BufferedReader br = new BufferedReader(new InputStreamReader(fis));
+        String line = null;
+
+
+
+        Pattern [] pattern = new Pattern[] {
+            Pattern.compile(".*timeout occurred during error reporting in step.*"),
+            Pattern.compile(".*timeout occurred during error reporting in step.*")
+        };
+        int currentPattern = 0;
+
+        String lastLine = null;
+        while ((line = br.readLine()) != null) {
+            if (currentPattern < pattern.length) {
+              if (pattern[currentPattern].matcher(line).matches()) {
+                System.out.println("Found: " + line + ".");
+                currentPattern ++;
+              }
+            }
+            lastLine = line;
+        }
+        br.close();
+
+        if (currentPattern < pattern.length) {
+            throw new RuntimeException("hs-err file incomplete (first missing pattern: " +  currentPattern + ")");
+        }
+
+        System.out.println("OK.");
+
+    }
+
+}
+