Program: 161888
Project: 161888
Buggy source:
public List<Path> generate() throws IOException {
  List<Path> paths=new ArrayList<>();
  Map<String,List<Tick>> demomap=new LinkedHashMap<>();
  Map<String,String> peeknext=new LinkedHashMap<>();
  String previous=null;
  for (  Tick tick : ticklist) {
    List<Tick> ticks;
    if (!demomap.containsKey(tick.getDemoName())) {
      ticks=new ArrayList<>();
      demomap.put(tick.getDemoName(),ticks);
    }
 else {
      ticks=demomap.get(tick.getDemoName());
    }
    ticks.add(tick);
    if (previous != null) {
      if (!peeknext.containsKey(previous) && !previous.equals(tick.getDemoName())) {
        peeknext.put(previous,tick.getDemoName());
      }
    }
    previous=tick.getDemoName();
  }
  int cfgCount=1;
  int padding=cfg.getInt(Key.VdmTickPadding);
  String skipStart=cfg.getString(Key.VdmSkipStartCommand);
  String skipStop=cfg.getString(Key.VdmSkipStopCommand);
  String rawSkipMode=cfg.getString(Key.VdmSkipMode);
  SkipMode skipMode=SkipMode.SKIP_AHEAD;
  try {
    skipMode=SkipMode.valueOf(rawSkipMode);
  }
 catch (  IllegalArgumentException ex) {
    log.warning("String_Node_Str" + rawSkipMode);
  }
  for (  Entry<String,List<Tick>> e : demomap.entrySet()) {
    String demo=e.getKey();
    log.finer("String_Node_Str" + demo);
    List<String> lines=new ArrayList<>();
    lines.add("String_Node_Str" + n + "String_Node_Str");
    int count=1;
    int previousEndTick=0;
    for (    Tick tick : e.getValue()) {
      int safeStart=Math.max(0,tick.getStart() - padding);
      if (skipMode == SkipMode.DEMO_TIMESCALE) {
        lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + (previousEndTick + 1) + "String_Node_Str","String_Node_Str" + skipStart + "String_Node_Str"));
        lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + safeStart + "String_Node_Str","String_Node_Str" + skipStop + "String_Node_Str"));
      }
 else       if (skipMode == SkipMode.SKIP_AHEAD) {
        lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + (previousEndTick + 1) + "String_Node_Str","String_Node_Str" + safeStart + "String_Node_Str"));
      }
      String command="String_Node_Str";
      if (tick.getSegment().startsWith("String_Node_Str")) {
        String demoCfgName=Util.stripFilenameExtension(tick.getDemoFile().getName());
        if (tick.getTemplate().equals(Record.Template) || tick.getTemplate().isEmpty()) {
          log.warning("String_Node_Str" + tick.toString() + "String_Node_Str");
        }
 else {
          log.info("String_Node_Str" + cfgCount + "String_Node_Str"+ tick);
          Map<String,Object> scopes=new HashMap<>();
          scopes.put("String_Node_Str",cfg.getTfPath().toAbsolutePath());
          scopes.put("String_Node_Str",cfg.getMoviePath().toAbsolutePath());
          scopes.put("String_Node_Str",demoCfgName);
          scopes.put("String_Node_Str",tick.getDemoFile().getAbsoluteFile());
          scopes.put("String_Node_Str",cfg.getTfPath().toAbsolutePath().resolve(demoCfgName));
          scopes.put("String_Node_Str",cfg.getTfPath().toAbsolutePath().resolve(demoCfgName + "String_Node_Str"));
          scopes.put("String_Node_Str",Paths.get("String_Node_Str").toAbsolutePath());
          scopes.put("String_Node_Str",n);
          Path outputPath=Paths.get("String_Node_Str",demoCfgName + "String_Node_Str" + cfgCount+ "String_Node_Str");
          Files.deleteIfExists(outputPath);
          try (Writer writer=Files.newBufferedWriter(outputPath,Charset.forName("String_Node_Str"))){
            MustacheFactory mf=new DefaultMustacheFactory();
            Mustache mustache=mf.compile(new StringReader(tick.getTemplate()),demoCfgName);
            mustache.execute(writer,scopes);
            writer.flush();
            paths.add(outputPath);
          }
 catch (          IOException ex) {
            log.log(Level.WARNING,"String_Node_Str",ex);
          }
        }
        command=((AbstractExec)tick).getCommand(cfgCount++);
      }
      if (tick.getSegment().equals(Exec.Segment)) {
        lines.add(segment(count++,"String_Node_Str",tick.getSegment(),"String_Node_Str" + tick.getStart() + "String_Node_Str","String_Node_Str" + command + "String_Node_Str"));
      }
 else {
        lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + tick.getStart() + "String_Node_Str","String_Node_Str" + command + "String_Node_Str"));
        lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + tick.getEnd() + "String_Node_Str","String_Node_Str"));
      }
      previousEndTick=tick.getEnd();
    }
    String nextdemo=peeknext.get(demo);
    if (nextdemo != null) {
      lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + (previousEndTick + 1) + "String_Node_Str","String_Node_Str" + nextdemo + "String_Node_Str"));
    }
 else {
      lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + (previousEndTick + 1) + "String_Node_Str","String_Node_Str"));
    }
    lines.add("String_Node_Str");
    Path added=Files.write(cfg.getTfPath().resolve(Util.stripFilenameExtension(demo) + "String_Node_Str"),lines,Charset.defaultCharset());
    paths.add(added);
    log.fine("String_Node_Str" + added);
  }
  return paths;
}

Fixed version (ground truth):
public List<Path> generate() throws IOException {
  List<Path> paths=new ArrayList<>();
  Map<String,List<Tick>> demomap=new LinkedHashMap<>();
  Map<String,String> peeknext=new LinkedHashMap<>();
  String previous=null;
  for (  Tick tick : ticklist) {
    List<Tick> ticks;
    if (!demomap.containsKey(tick.getDemoName())) {
      ticks=new ArrayList<>();
      demomap.put(tick.getDemoName(),ticks);
    }
 else {
      ticks=demomap.get(tick.getDemoName());
    }
    ticks.add(tick);
    if (previous != null) {
      if (!peeknext.containsKey(previous) && !previous.equals(tick.getDemoName())) {
        peeknext.put(previous,tick.getDemoName());
      }
    }
    previous=tick.getDemoName();
  }
  int cfgCount=1;
  int padding=cfg.getInt(Key.VdmTickPadding);
  String skipStart=cfg.getString(Key.VdmSkipStartCommand);
  String skipStop=cfg.getString(Key.VdmSkipStopCommand);
  String rawSkipMode=cfg.getString(Key.VdmSkipMode);
  SkipMode skipMode=SkipMode.SKIP_AHEAD;
  try {
    skipMode=SkipMode.valueOf(rawSkipMode);
  }
 catch (  IllegalArgumentException ex) {
    log.warning("String_Node_Str" + rawSkipMode);
  }
  for (  Entry<String,List<Tick>> e : demomap.entrySet()) {
    String demo=e.getKey();
    log.finer("String_Node_Str" + demo);
    List<String> lines=new ArrayList<>();
    lines.add("String_Node_Str" + n + "String_Node_Str");
    int count=1;
    int previousEndTick=0;
    for (    Tick tick : e.getValue()) {
      int safeStart=Math.max(0,tick.getStart() - padding);
      boolean needsSkip=previousEndTick + 1 < safeStart;
      if (needsSkip) {
        if (skipMode == SkipMode.DEMO_TIMESCALE) {
          lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + (previousEndTick + 1) + "String_Node_Str","String_Node_Str" + skipStart + "String_Node_Str"));
          lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + safeStart + "String_Node_Str","String_Node_Str" + skipStop + "String_Node_Str"));
        }
 else         if (skipMode == SkipMode.SKIP_AHEAD) {
          lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + (previousEndTick + 1) + "String_Node_Str","String_Node_Str" + safeStart + "String_Node_Str"));
        }
      }
      String command="String_Node_Str";
      if (tick.getSegment().startsWith("String_Node_Str")) {
        command=((AbstractExec)tick).getCommand(cfgCount);
        String demoCfgName=Util.stripFilenameExtension(tick.getDemoFile().getName());
        if (!tick.getTemplate().equals(Record.Template) && !tick.getTemplate().isEmpty() && !tick.getTemplate().toLowerCase().startsWith("String_Node_Str")) {
          log.info("String_Node_Str" + cfgCount + "String_Node_Str"+ tick);
          Map<String,Object> scopes=new HashMap<>();
          scopes.put("String_Node_Str",cfg.getTfPath().toAbsolutePath());
          scopes.put("String_Node_Str",cfg.getMoviePath().toAbsolutePath());
          scopes.put("String_Node_Str",demoCfgName);
          scopes.put("String_Node_Str",tick.getDemoFile().getAbsoluteFile());
          scopes.put("String_Node_Str",cfg.getTfPath().toAbsolutePath().resolve(demoCfgName));
          scopes.put("String_Node_Str",cfg.getTfPath().toAbsolutePath().resolve(demoCfgName + "String_Node_Str"));
          scopes.put("String_Node_Str",Paths.get("String_Node_Str").toAbsolutePath());
          scopes.put("String_Node_Str",n);
          Path outputPath=Paths.get("String_Node_Str",demoCfgName + "String_Node_Str" + cfgCount+ "String_Node_Str");
          Files.deleteIfExists(outputPath);
          try (Writer writer=Files.newBufferedWriter(outputPath,Charset.forName("String_Node_Str"))){
            MustacheFactory mf=new DefaultMustacheFactory();
            Mustache mustache=mf.compile(new StringReader(tick.getTemplate()),demoCfgName);
            mustache.execute(writer,scopes);
            writer.flush();
            paths.add(outputPath);
            cfgCount++;
          }
 catch (          IOException ex) {
            log.log(Level.WARNING,"String_Node_Str",ex);
          }
        }
      }
      if (tick.getSegment().equals(Exec.Segment)) {
        lines.add(segment(count++,"String_Node_Str",tick.getSegment(),"String_Node_Str" + tick.getStart() + "String_Node_Str","String_Node_Str" + command + "String_Node_Str"));
      }
 else {
        lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + tick.getStart() + "String_Node_Str","String_Node_Str" + command + "String_Node_Str"));
        lines.add(segment(count++,"String_Node_Str","String_Node_Str","String_Node_Str" + tick.getEnd() + "String_Node_Str","String_Node_Str"));
      }
      previousEndTick=tick.getEnd();
    }
    String nextdemo=peeknext.get(demo);
    if (nextdemo != null) {
      lines.add(segment(count,"String_Node_Str","String_Node_Str","String_Node_Str" + (previousEndTick + 1) + "String_Node_Str","String_Node_Str" + nextdemo + "String_Node_Str"));
    }
 else {
      lines.add(segment(count,"String_Node_Str","String_Node_Str","String_Node_Str" + (previousEndTick + 1) + "String_Node_Str","String_Node_Str"));
    }
    lines.add("String_Node_Str");
    Path added=Files.write(cfg.getTfPath().resolve(Util.stripFilenameExtension(demo) + "String_Node_Str"),lines,Charset.defaultCharset());
    paths.add(added);
    log.fine("String_Node_Str" + added);
  }
  return paths;
}