--- jsr166/src/test/tck/JSR166TestCase.java	2015/10/08 21:50:26	1.169
+++ jsr166/src/test/tck/JSR166TestCase.java	2015/10/09 19:09:59	1.174
@@ -20,6 +20,8 @@ import java.lang.management.ThreadMXBean
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.security.CodeSource;
 import java.security.Permission;
 import java.security.PermissionCollection;
@@ -52,6 +54,7 @@ import java.util.concurrent.ThreadFactor
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import junit.framework.AssertionFailedError;
@@ -188,20 +191,29 @@ public class JSR166TestCase extends Test
         return (regex == null) ? null : Pattern.compile(regex);
     }
 
+    // Instrumentation to debug very rare, but very annoying hung test runs.
     static volatile TestCase currentTestCase;
+    // static volatile int currentRun = 0;
     static {
         Runnable checkForWedgedTest = new Runnable() { public void run() {
-            // avoid spurious reports with enormous runsPerTest
-            final int timeoutMinutes = Math.max(runsPerTest / 10, 1);
+            // Avoid spurious reports with enormous runsPerTest.
+            // A single test case run should never take more than 1 second.
+            // But let's cap it at the high end too ...
+            final int timeoutMinutes =
+                Math.min(15, Math.max(runsPerTest / 60, 1));
             for (TestCase lastTestCase = currentTestCase;;) {
                 try { MINUTES.sleep(timeoutMinutes); }
                 catch (InterruptedException unexpected) { break; }
                 if (lastTestCase == currentTestCase) {
-                    System.err.println
-                        ("Looks like we're stuck running test: "
-                         + lastTestCase);
+                    System.err.printf(
+                        "Looks like we're stuck running test: %s%n",
+                        lastTestCase);
+//                     System.err.printf(
+//                         "Looks like we're stuck running test: %s (%d/%d)%n",
+//                         lastTestCase, currentRun, runsPerTest);
                     System.err.println("availableProcessors=" +
                         Runtime.getRuntime().availableProcessors());
+                    System.err.printf("cpu model = %s%n", cpuModel());
                     dumpTestThreads();
                     // one stack dump is probably enough; more would be spam
                     break;
@@ -213,6 +225,16 @@ public class JSR166TestCase extends Test
         thread.start();
     }
 
+    public static String cpuModel() {
+        try {
+            Matcher matcher = Pattern.compile("model name\\s*: (.*)")
+                .matcher(new String(
+                     Files.readAllBytes(Paths.get("/proc/cpuinfo")), "UTF-8"));
+            matcher.find();
+            return matcher.group(1);
+        } catch (Exception ex) { return null; }
+    }
+
     public void runBare() throws Throwable {
         currentTestCase = this;
         if (methodFilter == null
@@ -222,6 +244,7 @@ public class JSR166TestCase extends Test
 
     protected void runTest() throws Throwable {
         for (int i = 0; i < runsPerTest; i++) {
+            // currentRun = i;
             if (profileTests)
                 runTestProfiled();
             else