--- /dev/null	2013-11-27 18:16:58.000000000 +0100
+++ new/test/java/util/logging/TestLogConfigurationDeadLock.java	2013-11-27 18:16:58.000000000 +0100
@@ -0,0 +1,255 @@
+/*
+ * Copyright (c) 2013, 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.lang.management.ManagementFactory;
+import java.lang.management.ThreadInfo;
+import java.security.Permission;
+import java.security.Policy;
+import java.security.ProtectionDomain;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.logging.LogManager;
+import java.util.logging.Logger;
+
+
+/**
+ * @test
+ * @bug 8029281 8027670
+ * @summary Synchronization issues in Logger and LogManager. This test
+ *       focusses more particularly on potential deadlock in
+ *       drainLoggerRefQueueBounded / readConfiguration
+ * @run main/othervm TestLogConfigurationDeadLock
+ * @author danielfuchs
+ */
+// This test is a best effort to try & detect issues. The test itself will run
+// for 8secs. This is usually unsufficient to detect issues.
+// To get a greater confidence it is recommended to run this test in a loop:
+// e.g. use something like:
+// $ while jtreg -jdk:$JDK -verbose:all  \
+//      test/java/util/logging/TestLogConfigurationDeadLock.java ; \
+//      do echo Running test again ; done
+// and let it run for a few hours...
+//
+public class TestLogConfigurationDeadLock {
+
+    static volatile Exception thrown = null;
+    static volatile boolean goOn = true;
+
+    static final int READERS = 2;
+    static final int LOGGERS = 2;
+    static final long TIME = 4 * 1000; // 4 sec.
+    static final long STEP = 1 * 1000;  // message every 1 sec.
+    static final int  LCOUNT = 50; // 50 loggers created in a row...
+    static final AtomicLong nextLogger = new AtomicLong(0);
+    static final AtomicLong readCount = new AtomicLong(0);
+    static final AtomicLong checkCount = new AtomicLong(0);
+
+    /**
+     * This test will run both with and without a security manager.
+     *
+     * The test starts a number of threads that will call
+     *     LogManager.readConfiguration() concurrently (ReadConf), then starts
+     *     a number of threads that will create new loggers concurrently
+     *     (AddLogger), and then two additional threads: one (Stopper) that
+     *     will stop the test after 4secs (TIME ms), and one DeadlockDetector
+     *     that will attempt to detect deadlocks.
+     * If after 4secs no deadlock was detected and no exception was thrown
+     * then the test is considered a success and passes.
+     *
+     * This procedure is done twice: once without a security manager and once
+     * again with a security manager - which means the test takes ~8secs to
+     * run.
+     *
+     * Note that 8sec may not be enough to detect issues if there are some.
+     * This is a best effort test.
+     *
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) throws Exception {
+
+        // test without security
+        System.out.println("No security");
+        test();
+
+        // test with security
+        System.out.println("\nWith security");
+        Policy.setPolicy(new Policy() {
+            @Override
+            public boolean implies(ProtectionDomain domain, Permission permission) {
+                if (super.implies(domain, permission)) return true;
+                // System.out.println("Granting " + permission);
+                return true; // all permissions
+            }
+        });
+        System.setSecurityManager(new SecurityManager());
+        test();
+    }
+
+    /**
+     * Starts all threads, wait 4secs, then stops all threads.
+     * @throws Exception if a deadlock was detected or an error occurred.
+     */
+    public static void test() throws Exception {
+          goOn = true;
+          thrown = null;
+          long sNextLogger = nextLogger.get();
+          long sReadCount  = readCount.get();
+          long sCheckCount = checkCount.get();
+          List<Thread> threads = new ArrayList<>();
+          for (int i = 0; i<READERS; i++) {
+              threads.add(new ReadConf());
+          }
+          for (int i = 0; i<LOGGERS; i++) {
+              threads.add(new AddLogger());
+          }
+          threads.add(new DeadlockDetector());
+          threads.add(0, new Stopper(TIME));
+          for (Thread t : threads) {
+              t.start();
+          }
+          for (Thread t : threads) {
+              try {
+                  t.join();
+              } catch (Exception x) {
+                  fail(x);
+              }
+          }
+          if (thrown != null) {
+              throw thrown;
+          }
+          System.out.println("Passed: " + (nextLogger.get() - sNextLogger)
+                  + " loggers created by " + LOGGERS + " Thread(s),");
+          System.out.println("\t LogManager.readConfiguration() called "
+                  + (readCount.get() - sReadCount) + " times by " + READERS
+                  + " Thread(s).");
+          System.out.println("\t ThreadMXBean.findDeadlockedThreads called "
+                  + (checkCount.get() -sCheckCount) + " times by 1 Thread.");
+
+    }
+
+
+    final static class ReadConf extends Thread {
+        @Override
+        public void run() {
+            while (goOn) {
+                try {
+                    LogManager.getLogManager().readConfiguration();
+                    readCount.incrementAndGet();
+                    Thread.sleep(1);
+                } catch (Exception x) {
+                    fail(x);
+                }
+            }
+        }
+    }
+
+    final static class AddLogger extends Thread {
+        @Override
+        public void run() {
+            try {
+                while (goOn) {
+                    Logger l;
+                    Logger foo = Logger.getLogger("foo");
+                    Logger bar = Logger.getLogger("foo.bar");
+                    for (int i=0; i < LCOUNT ; i++) {
+                        l = Logger.getLogger("foo.bar.l"+nextLogger.incrementAndGet());
+                        l.fine("I'm fine");
+                        if (!goOn) break;
+                        Thread.sleep(1);
+                    }
+                }
+            } catch (InterruptedException | RuntimeException x ) {
+                fail(x);
+            }
+        }
+    }
+
+    final static class DeadlockDetector extends Thread {
+
+        @Override
+        public void run() {
+            while(goOn) {
+                try {
+                    long[] ids = ManagementFactory.getThreadMXBean().findDeadlockedThreads();
+                    checkCount.incrementAndGet();
+                    ids = ids == null ? new long[0] : ids;
+                    if (ids.length == 1) {
+                        throw new RuntimeException("Found 1 deadlocked thread: "+ids[0]);
+                    } else if (ids.length > 0) {
+                        ThreadInfo[] infos = ManagementFactory.getThreadMXBean().getThreadInfo(ids);
+                        System.err.println("Found "+ids.length+" deadlocked threads: ");
+                        for (ThreadInfo inf : infos) {
+                            System.err.println(inf.toString());
+                        }
+                        throw new RuntimeException("Found "+ids.length+" deadlocked threads");
+                    }
+                    Thread.sleep(100);
+                } catch(InterruptedException | RuntimeException x) {
+                    fail(x);
+                }
+            }
+        }
+
+    }
+
+    static final class Stopper extends Thread {
+        long start;
+        long time;
+
+        Stopper(long time) {
+            start = System.currentTimeMillis();
+            this.time = time;
+        }
+
+        @Override
+        public void run() {
+            try {
+                long rest, previous;
+                previous = time;
+                while (goOn && (rest = start - System.currentTimeMillis() + time) > 0) {
+                    if (previous == time || previous - rest >= STEP) {
+                        Logger.getLogger("remaining").info(String.valueOf(rest)+"ms remaining...");
+                        previous = rest == time ? rest -1 : rest;
+                        System.gc();
+                    }
+                    if (goOn == false) break;
+                    Thread.sleep(Math.min(rest, 100));
+                }
+                System.out.println(System.currentTimeMillis() - start
+                        + " ms elapsed ("+time+ " requested)");
+                goOn = false;
+            } catch(InterruptedException | RuntimeException x) {
+                fail(x);
+            }
+        }
+
+    }
+
+    static void fail(Exception x) {
+        x.printStackTrace();
+        if (thrown == null) {
+            thrown = x;
+        }
+        goOn = false;
+    }
+}