diff -up frysk-0.4/frysk-core/frysk/util/ProcRunUtil.java.lostfork frysk-0.4/frysk-core/frysk/util/ProcRunUtil.java
--- frysk-0.4/frysk-core/frysk/util/ProcRunUtil.java.lostfork	2010-03-30 09:44:35.000000000 -0400
+++ frysk-0.4/frysk-core/frysk/util/ProcRunUtil.java	2010-03-30 10:30:47.000000000 -0400
@@ -41,6 +41,7 @@ package frysk.util;
 
 import java.util.HashSet;
 
+import frysk.rsl.Log;
 import frysk.proc.Action;
 import frysk.proc.Manager;
 import frysk.proc.Proc;
@@ -58,8 +59,13 @@ import gnu.classpath.tools.getopt.Option
  * Utilities must implement {@link ProcRunObserver} to use.
  */
 public class ProcRunUtil {
+    private static final Log fine = Log.fine(ProcRunUtil.class);
 
     private final HashSet knownTasks = new HashSet();
+    // A fork triggers two events, one for the parent, and one for the
+    // child (when the child stops).  This is the set of tasks for
+    // which the child event has yet to arrive.
+    private final HashSet missingForkedOffspring = new HashSet();
     
     ForkedObserver forkedObserver = new ForkedObserver();
     AttachedObserver attachedObserver = new AttachedObserver();
@@ -115,6 +121,8 @@ public class ProcRunUtil {
     
     private void addObservers(Task task) {
 	if (knownTasks.add(task)) {
+	    fine.log(this, "addObservers", task);
+	    missingForkedOffspring.remove(task);
 	    task.requestAddClonedObserver(procRunObserver);
 	    task.requestAddExecedObserver(procRunObserver);
 	    task.requestAddForkedObserver(procRunObserver);
@@ -128,11 +136,14 @@ public class ProcRunUtil {
     
     class ForkedObserver implements TaskObserver.Forked {
 	public Action updateForkedOffspring(Task parent, Task offspring) {
+	    fine.log(this, "updateForkedOffspring parent", parent, "offspring", offspring);
 	    addObservers(offspring.getProc());
 	    return Action.BLOCK;
 	}
 
 	public Action updateForkedParent(Task parent, Task offspring) {
+	    fine.log(this, "updateForkedParent parent", parent, "offspring", offspring);
+	    missingForkedOffspring.add(offspring);
 	    return Action.CONTINUE;
 	}
 
@@ -198,7 +209,9 @@ public class ProcRunUtil {
 	public void taskRemoved (Task task)
 	{
 	    knownTasks.remove(task);
-	    if(knownTasks.size() == 0){
+	    fine.log(this, "taskRemoved", task, "knownTasks", knownTasks.size(),
+		     "missingForkedOffspring", missingForkedOffspring.size());
+	    if (knownTasks.size() == 0 && missingForkedOffspring.size() == 0){
 		Manager.eventLoop.requestStop();
 	    }
 	}