add watchdog when running tests

to give us a thread dump when they get stuck

h2/src/main/org/h2/util/ThreadDeadlockDetector.java

@@ -16,7 +16,6 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Timer;
 import java.util.TimerTask;
-
 import org.h2.mvstore.db.MVTable;
 
 /**
@@ -60,16 +59,27 @@ public class ThreadDeadlockDetector {
      * information.
      */
     void checkForDeadlocks() {
-        long[] ids = threadBean.findDeadlockedThreads();
-        if (ids == null) {
+        long[] deadlockedThreadIds = threadBean.findDeadlockedThreads();
+        if (deadlockedThreadIds == null) {
             return;
         }
+        dumpThreadsAndLocks("ThreadDeadlockDetector - deadlock found :",
+                threadBean, deadlockedThreadIds);
+    }
+
+    public static void dumpAllThreadsAndLocks(String msg) {
+        final ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
+        final long[] allThreadIds = threadBean.getAllThreadIds();
+        dumpThreadsAndLocks(msg, threadBean, allThreadIds);
+    }
 
+    private static void dumpThreadsAndLocks(String msg, ThreadMXBean threadBean, long[] threadIds)
+    {
         final StringWriter stringWriter = new StringWriter();
         final PrintWriter print = new PrintWriter(stringWriter);
 
-        print.println("ThreadDeadlockDetector - deadlock found :");
-        final ThreadInfo[] infos = threadBean.getThreadInfo(ids, true, true);
+        print.println(msg);
+        final ThreadInfo[] infos = threadBean.getThreadInfo(threadIds, true, true);
         final HashMap<Long, String> tableWaitingForLockMap =
                 MVTable.WAITING_FOR_LOCK.getSnapshotOfAllThreads();
         final HashMap<Long, ArrayList<String>> tableExclusiveLocksMap =

h2/src/test/org/h2/test/TestAll.java

@@ -9,6 +9,7 @@ import java.lang.management.ManagementFactory;
 import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.Properties;
+import java.util.TimerTask;
 import org.h2.Driver;
 import org.h2.engine.Constants;
 import org.h2.store.fs.FilePathRec;
@@ -224,6 +225,7 @@ import org.h2.util.New;
 import org.h2.util.Profiler;
 import org.h2.util.StringUtils;
 import org.h2.util.Task;
+import org.h2.util.ThreadDeadlockDetector;
 import org.h2.util.Utils;
 
 /**
@@ -920,7 +922,20 @@ kill -9 `jps -l | grep "org.h2.test." | cut -d " " -f 1`
         // tests.add(test);
         // run directly for now, because concurrently running tests
         // fails on Raspberry Pi quite often (seems to be a JVM problem)
-        test.runTest(this);
+
+        // event queue watchdog for tests that get stuck when running in Jenkins CI
+        final java.util.Timer watchdog = new java.util.Timer();
+        watchdog.schedule(new TimerTask() {
+            @Override
+            public void run() {
+                ThreadDeadlockDetector.dumpAllThreadsAndLocks("test watchdog timed out");
+            }
+        }, 5 * 60 * 1000); // 5 minutes
+        try {
+            test.runTest(this);
+        } finally {
+            watchdog.cancel();
+        }
     }
 
     private void runAddedTests() {