diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/FileTreeWalker.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/FileTreeWalker.java
index 7729db4ef96d8fce05744917ebc82ece10b1db34..2b61ad54861316c9c5eb818076b42850625d7bfa 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/FileTreeWalker.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/FileTreeWalker.java
@@ -50,10 +50,13 @@ public class FileTreeWalker {
 
     private Collection<LogFileParseException> parseErrors;
 
+    /** List of test run directories that were candidates for analysis. */
+    private Collection<Path> consideredTestRuns;
+
     public Collection<RPackage> ftw(Path root, Date sinceDate, String glob) throws IOException {
 
         try (DirectoryStream<Path> stream = Files.newDirectoryStream(root, glob)) {
-            parseErrors = new ArrayList<>();
+            reset();
             Collection<RPackage> pkgs = new LinkedList<>();
             for (Path p : stream) {
                 if (Files.isDirectory(p)) {
@@ -61,10 +64,16 @@ public class FileTreeWalker {
                     pkgs.addAll(pkgVersions);
                 }
             }
+            LOGGER.info("Total number of analysis candidates: " + consideredTestRuns.size());
             return pkgs;
         }
     }
 
+    private void reset() {
+        parseErrors = new ArrayList<>();
+        consideredTestRuns = new ArrayList<>();
+    }
+
     protected Collection<RPackage> visitPackageRoot(Path pkgRoot, Date sinceDate) throws IOException {
         String pkgName = pkgRoot.getFileName().toString();
 
@@ -111,6 +120,7 @@ public class FileTreeWalker {
             FileTime lastModifiedTime = Files.getLastModifiedTime(logFile);
             if (isNewerThan(lastModifiedTime, sinceDate)) {
                 Collection<Problem> problems = parseLogFile(logFile, pkgTestRun);
+                consideredTestRuns.add(testRunDir);
                 pkgTestRun.setProblems(problems);
                 return pkgTestRun;
             } else {
@@ -160,4 +170,8 @@ public class FileTreeWalker {
         return parseErrors;
     }
 
+    public Collection<Path> getConsideredTestRuns() {
+        return consideredTestRuns;
+    }
+
 }
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Location.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Location.java
index 465bc13607a08f02e8f68af4bf79cbaf9b17924c..ba4b19ed1d8c8bf08645123cfc3b48077ef4201e 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Location.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Location.java
@@ -40,4 +40,37 @@ public class Location {
         return file + "(" + (lineNr + 1) + ")";
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((file == null) ? 0 : file.hashCode());
+        result = prime * result + lineNr;
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        Location other = (Location) obj;
+        if (lineNr != other.lineNr) {
+            return false;
+        }
+        if (file == null) {
+            if (other.file != null) {
+                return false;
+            }
+        } else if (!file.equals(other.file)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Problem.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Problem.java
index 273df22d8ff44b4cd3140abaaf0b7f0edfcfd260..5aeb19aef390a62bb570048197c01df058ae8490 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Problem.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Problem.java
@@ -25,6 +25,7 @@ package com.oracle.truffle.r.test.packages.analyzer;
 import java.util.Comparator;
 import java.util.Objects;
 
+import com.oracle.truffle.r.test.packages.analyzer.detectors.Detector;
 import com.oracle.truffle.r.test.packages.analyzer.model.RPackage;
 import com.oracle.truffle.r.test.packages.analyzer.model.RPackageTestRun;
 
@@ -35,10 +36,12 @@ public abstract class Problem {
 
     private final RPackageTestRun pkgTestRun;
     private final Location location;
+    private final Detector<?> detector;
 
-    protected Problem(RPackageTestRun pkg, Location location) {
+    protected Problem(RPackageTestRun pkg, Detector<?> detector, Location location) {
         this.pkgTestRun = Objects.requireNonNull(pkg);
         this.location = Objects.requireNonNull(location);
+        this.detector = Objects.requireNonNull(detector);
     }
 
     public RPackage getPackage() {
@@ -53,6 +56,10 @@ public abstract class Problem {
         return location;
     }
 
+    public Detector<?> getDetector() {
+        return detector;
+    }
+
     /**
      * Returns a one-line summary of the problem (e.g.
      * <q>RuntimeException occurred</q>).
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/Detector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/Detector.java
index b904fd36eff91bf02a70ca8c6301002b5d562706..b71512b5e51415511a5add23996e8ed1c71343a0 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/Detector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/Detector.java
@@ -23,6 +23,7 @@
 package com.oracle.truffle.r.test.packages.analyzer.detectors;
 
 import java.util.Collection;
+import java.util.LinkedList;
 
 import com.oracle.truffle.r.test.packages.analyzer.Location;
 import com.oracle.truffle.r.test.packages.analyzer.Problem;
@@ -33,14 +34,23 @@ public abstract class Detector<T> {
     /** Semantics: If a child reports an error for a particular location, the parent doesn't. */
     protected Detector<?> parent;
 
+    protected final Collection<Detector<?>> children = new LinkedList<>();
+
     public Detector(Detector<?> parent) {
         this.parent = parent;
+        if (parent != null) {
+            parent.children.add(this);
+        }
     }
 
     public Detector<?> getParent() {
         return parent;
     }
 
+    public Collection<Detector<?>> getChildren() {
+        return children;
+    }
+
     public abstract String getName();
 
     /**
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DiffDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DiffDetector.java
index 87f184b6bf576bdcedc86894d6debe93f4b37937..8cd40a6d7176a75ebbad84e15cd8e042eaf1f5a9 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DiffDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DiffDetector.java
@@ -60,7 +60,7 @@ public class DiffDetector extends Detector<List<DiffChunk>> {
             } else {
                 summary = "Major difference in test output";
             }
-            problems.add(new DiffProblem(pkg, diffChunk.getLocation(), summary, diffChunk));
+            problems.add(new DiffProblem(pkg, this, diffChunk.getLocation(), summary, diffChunk));
         }
         return problems;
     }
@@ -78,8 +78,8 @@ public class DiffDetector extends Detector<List<DiffChunk>> {
         private final String summary;
         private final DiffChunk diffChunk;
 
-        protected DiffProblem(RPackageTestRun pkg, Location location, String summary, DiffChunk diffChunk) {
-            super(pkg, location);
+        protected DiffProblem(RPackageTestRun pkg, DiffDetector detector, Location location, String summary, DiffChunk diffChunk) {
+            super(pkg, detector, location);
             this.summary = Objects.requireNonNull(summary);
             this.diffChunk = Objects.requireNonNull(diffChunk);
         }
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DummyDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DummyDetector.java
new file mode 100644
index 0000000000000000000000000000000000000000..c9c7e2a50775cd3b65c2f9f2db737a552e29f617
--- /dev/null
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DummyDetector.java
@@ -0,0 +1,50 @@
+/*
+ * 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.
+ */
+package com.oracle.truffle.r.test.packages.analyzer.detectors;
+
+import java.util.Collection;
+import java.util.Collections;
+
+import com.oracle.truffle.r.test.packages.analyzer.Location;
+import com.oracle.truffle.r.test.packages.analyzer.Problem;
+import com.oracle.truffle.r.test.packages.analyzer.model.RPackageTestRun;
+
+public final class DummyDetector extends Detector<Void> {
+
+    public static final DummyDetector INSTANCE = new DummyDetector();
+
+    private DummyDetector() {
+        super(null);
+    }
+
+    @Override
+    public String getName() {
+        return "Dummy detector";
+    }
+
+    @Override
+    public Collection<Problem> detect(RPackageTestRun pkgTestRun, Location startLineLocation, Void body) {
+        return Collections.emptyList();
+    }
+
+}
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/InstallationProblemDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/InstallationProblemDetector.java
index 0e44c19aa6f47c95d7b492f7235000385a642347..b63d31b1d5a274a6fcc4bee78685afc50b058885 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/InstallationProblemDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/InstallationProblemDetector.java
@@ -52,8 +52,7 @@ public class InstallationProblemDetector extends LineDetector {
         for (String line : body) {
             Matcher matcher = pattern.matcher(line);
             if (matcher.matches()) {
-                return Collections.singletonList(
-                                new PackageInstallationProblem(pkg, new Location(startLocation.file, lineNr), line));
+                return Collections.singletonList(new PackageInstallationProblem(pkg, this, new Location(startLocation.file, lineNr), line));
             }
             ++lineNr;
         }
@@ -64,8 +63,8 @@ public class InstallationProblemDetector extends LineDetector {
 
         private final String message;
 
-        public PackageInstallationProblem(RPackageTestRun pkg, Location location, String message) {
-            super(pkg, location);
+        public PackageInstallationProblem(RPackageTestRun pkg, InstallationProblemDetector detector, Location location, String message) {
+            super(pkg, detector, location);
             this.message = message;
         }
 
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RErrorDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RErrorDetector.java
index 4208e2f90de8dc47da6738eab3289a690a30dfab..6f304037442499e61d0c18c2ed1673139cc08996 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RErrorDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RErrorDetector.java
@@ -68,7 +68,7 @@ public class RErrorDetector extends LineDetector {
                     message = it.next();
                     ++i;
                 }
-                problems.add(new RErrorProblem(pkg, new Location(startLocation.file, i + lineOffset), callString, message));
+                problems.add(new RErrorProblem(pkg, this, new Location(startLocation.file, i + lineOffset), callString, message));
             }
         }
 
@@ -80,8 +80,8 @@ public class RErrorDetector extends LineDetector {
         private final String callString;
         private final String message;
 
-        protected RErrorProblem(RPackageTestRun pkg, Location location, String callString, String message) {
-            super(pkg, location);
+        protected RErrorProblem(RPackageTestRun pkg, RErrorDetector detector, Location location, String callString, String message) {
+            super(pkg, detector, location);
             this.callString = callString;
             this.message = message;
         }
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RInternalErrorDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RInternalErrorDetector.java
index 43793ec9c94d366454a64a58afe0eeeb5d0bfa55..56b5e78cedd8a748cc08ebf527e7f1632dedea1d 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RInternalErrorDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RInternalErrorDetector.java
@@ -54,7 +54,7 @@ public class RInternalErrorDetector extends LineDetector {
             int indexOf = line.indexOf(P);
             if (indexOf != -1) {
                 String message = line.substring(indexOf + P.length());
-                problems.add(new RInternalErrorProblem(pkg, new Location(startLocation.file, lineNr), message));
+                problems.add(new RInternalErrorProblem(pkg, this, new Location(startLocation.file, lineNr), message));
             }
             ++lineNr;
         }
@@ -65,8 +65,8 @@ public class RInternalErrorDetector extends LineDetector {
 
         private final String message;
 
-        protected RInternalErrorProblem(RPackageTestRun pkg, Location location, String message) {
-            super(pkg, location);
+        protected RInternalErrorProblem(RPackageTestRun pkg, RInternalErrorDetector detector, Location location, String message) {
+            super(pkg, detector, location);
             this.message = message;
         }
 
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/SegfaultDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/SegfaultDetector.java
index 94e508b463e94e78f97489f2d6d258c80fdd5d8f..f23d7933a922ec8d504301440eaf8c36fcc8a9d7 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/SegfaultDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/SegfaultDetector.java
@@ -49,21 +49,26 @@ public class SegfaultDetector extends LineDetector {
         boolean collect = false;
         assert body.isEmpty() || startLocation != null;
         int lineNr = startLocation != null ? startLocation.lineNr : 0;
+        boolean takeNextLine = false;
         for (String line : body) {
-            if (SIGSEGV_START.equals(line.trim())) {
+            if (line.contains(SIGSEGV_START)) {
                 collect = true;
             }
             if (collect) {
-                if (!line.isEmpty() && line.charAt(0) == '#') {
-                    segfaultMessage.append(line).append(System.lineSeparator());
-                } else {
+                if (takeNextLine) {
+                    segfaultMessage.append(line);
+                    takeNextLine = false;
+                }
+                if (line.contains("Problematic frame")) {
+                    takeNextLine = true;
+                } else if (!line.contains("#")) {
                     break;
                 }
             }
             ++lineNr;
         }
         if (collect) {
-            return Collections.singleton(new SegfaultProblem(pkg, new Location(startLocation.file, lineNr), segfaultMessage.toString()));
+            return Collections.singleton(new SegfaultProblem(pkg, this, new Location(startLocation.file, lineNr), segfaultMessage.toString()));
         }
         return Collections.emptyList();
     }
@@ -72,8 +77,8 @@ public class SegfaultDetector extends LineDetector {
 
         private final String message;
 
-        protected SegfaultProblem(RPackageTestRun pkg, Location location, String message) {
-            super(pkg, location);
+        protected SegfaultProblem(RPackageTestRun pkg, SegfaultDetector detector, Location location, String message) {
+            super(pkg, detector, location);
             this.message = message;
         }
 
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/UnsupportedSpecializationDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/UnsupportedSpecializationDetector.java
index 678108f3432b383281fd6d5d6de1c5575df71cfb..99f270940e23845ce25a4c3b260b9f278ca748d4 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/UnsupportedSpecializationDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/UnsupportedSpecializationDetector.java
@@ -60,7 +60,7 @@ public class UnsupportedSpecializationDetector extends LineDetector {
             if (matcher.find()) {
                 message = matcher.group("MSG");
                 problemStartLine = lineNr;
-                problems.add(new UnsupportedSpecializationProblem(pkg, new Location(startLocation.file, problemStartLine), message));
+                problems.add(new UnsupportedSpecializationProblem(pkg, this, new Location(startLocation.file, problemStartLine), message));
             }
             ++lineNr;
         }
@@ -69,8 +69,8 @@ public class UnsupportedSpecializationDetector extends LineDetector {
 
     private static class UnsupportedSpecializationProblem extends Problem {
 
-        protected UnsupportedSpecializationProblem(RPackageTestRun pkg, Location location, String message) {
-            super(pkg, location);
+        protected UnsupportedSpecializationProblem(RPackageTestRun pkg, UnsupportedSpecializationDetector detector, Location location, String message) {
+            super(pkg, detector, location);
             this.message = message;
         }
 
@@ -83,7 +83,7 @@ public class UnsupportedSpecializationDetector extends LineDetector {
 
         @Override
         public String getSummary() {
-            return "com.oracle.truffle.api.dsl.UnsupportedSpecializationException";
+            return "UnsupportedSpecializationException";
         }
 
         @Override
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/AbstractDumper.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/AbstractDumper.java
index ff4ef7de99fc87760a21bca94bc92b85dbc588cc..283b1ee631270e4f2d84ed50ad983b54891fdc61 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/AbstractDumper.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/AbstractDumper.java
@@ -24,11 +24,15 @@ package com.oracle.truffle.r.test.packages.analyzer.dump;
 
 import java.util.Collection;
 import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 import com.oracle.truffle.r.test.packages.analyzer.Problem;
+import com.oracle.truffle.r.test.packages.analyzer.detectors.Detector;
 import com.oracle.truffle.r.test.packages.analyzer.model.RPackage;
 import com.oracle.truffle.r.test.packages.analyzer.model.RPackageTestRun;
 import com.oracle.truffle.r.test.packages.analyzer.parser.LogFileParseException;
@@ -60,6 +64,44 @@ public abstract class AbstractDumper {
         return problems.stream().collect(Collectors.groupingBy(p -> new ProblemContent(p)));
     }
 
+    protected static Collection<Problem> eliminateRedundantProblems(Collection<Problem> problems) {
+        // build detector hierarchy
+        Set<Detector<?>> collect = problems.stream().map(p -> p.getDetector()).collect(Collectors.toSet());
+        Map<Detector<?>, Collection<Detector<?>>> hierarchy = new HashMap<>();
+        for (Detector<?> detector : collect) {
+            hierarchy.put(detector, collectChildrenRecursive(detector));
+        }
+
+        Map<Detector<?>, List<Problem>> collect2 = problems.stream().collect(Collectors.groupingBy(p -> p.getDetector()));
+
+        return problems.stream().filter(p -> isIncluded(p, hierarchy, collect2)).collect(Collectors.toList());
+    }
+
+    /**
+     * Returns {@code false} if any of the problem detector's children has reported a problem in the
+     * same location. Returns {@code true} otherwise.
+     */
+    private static boolean isIncluded(Problem p, Map<Detector<?>, Collection<Detector<?>>> hierarchy, Map<Detector<?>, List<Problem>> problemsTable) {
+        Collection<Detector<?>> children = hierarchy.get(p.getDetector());
+        for (Detector<?> childDetector : children) {
+            if (problemsTable.containsKey(childDetector)) {
+                for (Problem childProblem : problemsTable.get(childDetector)) {
+                    if (childProblem.getLocation().equals(p.getLocation())) {
+                        return false;
+                    }
+                }
+            }
+        }
+        return true;
+    }
+
+    private static Collection<Detector<?>> collectChildrenRecursive(Detector<?> detector) {
+        Collection<Detector<?>> all = new LinkedList<>();
+        all.addAll(detector.getChildren());
+        detector.getChildren().stream().forEach(c -> all.addAll(collectChildrenRecursive(c)));
+        return all;
+    }
+
     protected static class ProblemContent {
 
         final Problem representitive;
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLBuilder.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLBuilder.java
index 77f65892ec044b98f2f52f4e8d37149ac364d7bc..b98cb6973e2b3ce507e375f6b7f7f83f2a81787b 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLBuilder.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLBuilder.java
@@ -112,6 +112,10 @@ public class HTMLBuilder {
         return generic("p", content);
     }
 
+    public Tag p(Tag... children) {
+        return generic("p", children);
+    }
+
     public Tag generic(String key, String content, Tag... children) {
         return new Tag(key, content, Arrays.stream(children).collect(Collectors.toList()));
     }
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLDumper.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLDumper.java
index cbef665b161b484d021de940c7c5bd1428f08c46..ccb9666c6ddfa27accffd3f98c7889a6a9c6b701 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLDumper.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLDumper.java
@@ -62,39 +62,45 @@ public class HTMLDumper extends AbstractDumper {
         if (!Files.exists(destDir)) {
             Files.createDirectories(destDir);
         }
-        return Files.isWritable(destDir);
+        // test creating a file in the output directory
+        Path testFile = destDir.resolve("test.html");
+        Files.createFile(testFile);
+        Files.deleteIfExists(testFile);
+        return true;
     }
 
     @Override
-    public void dump(Collection<RPackage> problems, Collection<LogFileParseException> parseErrors) {
+    public void dump(Collection<RPackage> packages, Collection<LogFileParseException> parseErrors) {
         try {
             createAndCheckOutDir();
-            dumpIndexFile(problems, parseErrors);
+            dumpIndexFile(packages, parseErrors);
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 
-    private void dumpIndexFile(Collection<RPackage> problems, Collection<LogFileParseException> parseErrors) {
+    private void dumpIndexFile(Collection<RPackage> packages, Collection<LogFileParseException> parseErrors) {
         Path indexFile = destDir.resolve("index.html");
 
         try (BufferedWriter bw = Files.newBufferedWriter(indexFile, CREATE, TRUNCATE_EXISTING, WRITE)) {
             HTMLBuilder builder = new HTMLBuilder(new PrintWriter(bw));
 
-            Collection<Problem> allProblems = collectAllProblems(problems);
-            Collection<RPackageTestRun> allTestRuns = collectTestRuns(problems);
+            Collection<Problem> allProblems = collectAllProblems(packages);
+            Collection<RPackageTestRun> allTestRuns = collectTestRuns(packages);
+
+            allProblems = eliminateRedundantProblems(allProblems);
 
             Tag errorDistributionTable = generateTypeDistributionTable(builder, groupByType(allProblems));
             Tag pkgDistributionTable = generateTestRunDistributionTable(builder, groupByTestRuns(allTestRuns, allProblems));
             Tag distrinctProblemDistributionTable = generateDistinctProblemDistribution(builder, groupByProblemContent(allProblems));
-            Tag parseErrorsList = generateParseErrorsList(builder, parseErrors);
 
             builder.html(builder.head(builder.title(TITLE)), builder.body(
-                            builder.h1(TITLE), builder.p("Numer of analyzed package test runs: " + allTestRuns.size()),
+                            builder.h1(TITLE),
+                            builder.p("Total number of analysis candidates: " + allTestRuns.size()),
+                            builder.p(builder.a(generateParseErrorsList(parseErrors), "Test runs failed to analyze: " + parseErrors.size())),
                             builder.h2("Distribution by Problem Type"), errorDistributionTable,
                             builder.h2("Distribution by Package Test Run"), pkgDistributionTable,
-                            builder.h2("Distinct Problem Distribution"), distrinctProblemDistributionTable,
-                            builder.h2("Failed Analysis Runs"), parseErrorsList));
+                            builder.h2("Distinct Problem Distribution"), distrinctProblemDistributionTable));
             builder.dump();
         } catch (IOException e) {
             e.printStackTrace();
@@ -129,6 +135,7 @@ public class HTMLDumper extends AbstractDumper {
                         builder.th("Test Run"),
                         builder.th("Result"),
                         builder.th("Problem Count")));
+        table.addAttribute("border", "1");
 
         for (RPackageTestRun testRun : collect) {
             String pkgFileName = dumpTableFile(testRun.getPackage().toString() + "_" + testRun.getNumber() + ".html", testRun.toString(), testRun, groupByPkg);
@@ -153,6 +160,7 @@ public class HTMLDumper extends AbstractDumper {
                         builder.th("Problem"),
                         builder.th("Problem Count"),
                         builder.th("Representitive Message")));
+        table.addAttribute("border", "1");
 
         int i = 0;
         for (ProblemContent problem : collect) {
@@ -173,6 +181,7 @@ public class HTMLDumper extends AbstractDumper {
         List<Class<? extends Problem>> collect = groupByType.keySet().stream().sorted((a, b) -> Integer.compare(groupByType.get(b).size(), groupByType.get(a).size())).collect(Collectors.toList());
 
         Tag table = builder.table();
+        table.addAttribute("border", "1");
         for (Class<? extends Problem> type : collect) {
             String problemClassFileName = dumpTableFile(type.getSimpleName() + ".html", type.getName(), type, groupByType);
             table.addChild(builder.tr(
@@ -216,20 +225,26 @@ public class HTMLDumper extends AbstractDumper {
         return table;
     }
 
-    private static Tag generateParseErrorsList(HTMLBuilder builder, Collection<LogFileParseException> parseErrors) {
-
-        Tag table = builder.table(builder.tr(
-                        builder.th("Package Test Run"),
-                        builder.th("Location"),
-                        builder.th("Message")));
+    private String generateParseErrorsList(Collection<LogFileParseException> parseErrors) throws IOException {
 
-        for (LogFileParseException e : parseErrors) {
-            table.addChild(builder.tr(
-                            builder.td(e.getTestRun().toString()),
-                            builder.td(e.getLocation().toString()),
-                            builder.td(e.getMessage())));
+        Path problemClassFile = destDir.resolve("failedToAnalyze.html");
+        try (BufferedWriter bw = Files.newBufferedWriter(problemClassFile, CREATE, TRUNCATE_EXISTING, WRITE)) {
+            HTMLBuilder builder = new HTMLBuilder(new PrintWriter(bw));
+            Tag table = builder.table(builder.tr(
+                            builder.th("Package Test Run"),
+                            builder.th("Location"),
+                            builder.th("Message")));
+            table.addAttribute("border", "1");
+            for (LogFileParseException e : parseErrors) {
+                table.addChild(builder.tr(
+                                builder.td(e.getTestRun().toString()),
+                                builder.td(e.getLocation().toString()),
+                                builder.td(e.getMessage())));
+            }
+            builder.html(builder.head(builder.title("Test Runs Failed to Analyze")), builder.body(table));
+            builder.dump();
         }
-        return table;
+        return problemClassFile.getFileName().toString();
     }
 
 }
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/parser/LogFileParser.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/parser/LogFileParser.java
index 9aacf507de06db38cfb78969224820351eb58d33..5c3edb0bfa82cf47cc782ff5f46416286617f6e9 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/parser/LogFileParser.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/parser/LogFileParser.java
@@ -25,6 +25,7 @@ package com.oracle.truffle.r.test.packages.analyzer.parser;
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.nio.file.Files;
+import java.nio.file.NoSuchFileException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.ArrayList;
@@ -34,12 +35,14 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Optional;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 
 import com.oracle.truffle.r.test.packages.analyzer.Location;
 import com.oracle.truffle.r.test.packages.analyzer.Problem;
 import com.oracle.truffle.r.test.packages.analyzer.detectors.Detector;
+import com.oracle.truffle.r.test.packages.analyzer.detectors.DummyDetector;
 import com.oracle.truffle.r.test.packages.analyzer.detectors.LineDetector;
 import com.oracle.truffle.r.test.packages.analyzer.model.RPackageTestRun;
 import com.oracle.truffle.r.test.packages.analyzer.parser.DiffParser.DiffChunk;
@@ -139,7 +142,7 @@ public class LogFileParser {
                 consumeLine();
                 int idx = curLine.text.indexOf(Token.CONTENT_MALFORMED.linePrefix);
                 String fileNameStr = curLine.text.substring(idx + Token.CONTENT_MALFORMED.linePrefix.length()).trim();
-                checkResults.problems.add(new ContentMalformedProblem(pkg, getCurrentLocation(), fileNameStr));
+                checkResults.problems.add(new ContentMalformedProblem(pkg, DummyDetector.INSTANCE, getCurrentLocation(), fileNameStr));
             } else if (la.text.contains(Token.OUTPUT_MISMATCH_FASTR.linePrefix)) {
                 consumeLine();
                 // extract file name of output file
@@ -149,16 +152,29 @@ public class LogFileParser {
                 Path outputFile = logFile.path.resolveSibling(Paths.get("testfiles", "fastr", fileNameStr));
 
                 // report the problem
-                checkResults.problems.add(new OutputMismatchProblem(pkg, getCurrentLocation(), fileNameStr));
+                checkResults.problems.add(new OutputMismatchProblem(pkg, DummyDetector.INSTANCE, getCurrentLocation(), fileNameStr));
 
-                if (!Files.isReadable(outputFile)) {
-                    LOGGER.warning("Cannot read output file " + outputFile);
-
-                    // consume any lines to be able to continue
-                    collectBody(Token.END_CHECKING);
-                } else {
+                if (Files.isReadable(outputFile)) {
                     checkResults.problems.addAll(applyDetectors(Token.OUTPUT_MISMATCH_FASTR, outputFile, 0, Files.readAllLines(outputFile)));
+                } else {
+                    // try to find the file anywhere in the test run directory (there were some
+                    // cases)
+                    Optional<Path> findFirst = null;
+                    try {
+                        findFirst = Files.find(logFile.path.getParent(), 3, (path, attr) -> path.getFileName().equals(outputFile.getFileName())).findFirst();
+                        if (findFirst.isPresent()) {
+                            checkResults.problems.addAll(applyDetectors(Token.OUTPUT_MISMATCH_FASTR, findFirst.get(), 0, Files.readAllLines(findFirst.get())));
+                        }
+                    } catch (NoSuchFileException e) {
+                    }
+                    if (findFirst == null || !findFirst.isPresent()) {
+                        LOGGER.warning("Cannot read output file " + outputFile);
+
+                        // consume any lines to be able to continue
+                        collectBody(Token.END_CHECKING);
+                    }
                 }
+
                 checkResults.setSuccess(false);
             } else {
                 break;
@@ -352,23 +368,24 @@ public class LogFileParser {
             assert startLineNr >= 0;
             startLocation = new Location(file, startLineNr);
         }
-        List<Problem> problems = new LinkedList<>();
+        Map<LineDetector, Collection<Problem>> problems = new HashMap<>();
         Collection<LineDetector> collection = detectorsTable.get(start.name());
         if (collection != null) {
             for (LineDetector detector : collection) {
                 Collection<Problem> detectedProblems = detector.detect(pkg, startLocation, body);
                 if (detectedProblems != null) {
-                    problems.addAll(detectedProblems);
+                    problems.put(detector, detectedProblems);
                 }
             }
         }
         for (LineDetector detector : anyDetectors) {
             Collection<Problem> detectedProblems = detector.detect(pkg, startLocation, body);
             if (detectedProblems != null) {
-                problems.addAll(detectedProblems);
+                problems.put(detector, detectedProblems);
             }
         }
-        return problems;
+
+        return problems.values().stream().flatMap(p -> p.stream()).collect(Collectors.toList());
     }
 
     private Collection<Problem> applyTestResultDetectors(List<DiffChunk> diffChunk) {
@@ -663,8 +680,8 @@ public class LogFileParser {
 
         private final String details;
 
-        protected OutputMismatchProblem(RPackageTestRun pkg, Location location, String details) {
-            super(pkg, location);
+        protected OutputMismatchProblem(RPackageTestRun pkg, Detector<?> detector, Location location, String details) {
+            super(pkg, detector, location);
             this.details = details;
         }
 
@@ -698,8 +715,8 @@ public class LogFileParser {
 
         private final String details;
 
-        protected ContentMalformedProblem(RPackageTestRun pkg, Location location, String details) {
-            super(pkg, location);
+        protected ContentMalformedProblem(RPackageTestRun pkg, Detector<?> detector, Location location, String details) {
+            super(pkg, detector, location);
             this.details = details;
         }