Program: 163234
Project: 163234
Buggy source:
@Override public void execute(char[] characters,int length){
  Set<Character> allSymbols=new HashSet<Character>();
  Map<Character,Integer> symbols=new HashMap<Character,Integer>();
  Map<Character,Integer> escape=new HashMap<Character,Integer>();
  List<Map<Character,Integer>> symbolsPerRow=new ArrayList<Map<Character,Integer>>();
  int doubleQuoteCount=0;
  int singleQuoteCount=0;
  int i;
  char inQuote='\0';
  boolean afterNewLine=true;
  for (i=0; i < length; i++) {
    char ch=characters[i];
    if (afterNewLine && ch == comment) {
      while (++i < length) {
        ch=characters[i];
        if (ch == '\r' || ch == '\n' || ch == normalizedNewLine) {
          break;
        }
      }
      continue;
    }
    if (ch == '"' || ch == '\'') {
      if (inQuote == ch) {
        if (ch == '"') {
          doubleQuoteCount++;
        }
 else {
          singleQuoteCount++;
        }
        if (i + 1 < length) {
          char next=characters[i + 1];
          if (Character.isLetterOrDigit(next) || (next <= ' ' && whitespaceRangeStart < next && next != '\n' && next != '\r')) {
            char prev=characters[i - 1];
            if (!Character.isLetterOrDigit(prev)) {
              increment(escape,prev);
            }
          }
        }
        inQuote='\0';
      }
 else       if (inQuote == '\0') {
        char prev='\0';
        int j=i;
        while (prev <= ' ' && --j >= 0) {
          prev=characters[j];
        }
        if (j < 0 || !Character.isLetterOrDigit(prev)) {
          inQuote=ch;
        }
      }
      continue;
    }
    if (inQuote != '\0') {
      continue;
    }
    afterNewLine=false;
    if (isSymbol(ch)) {
      allSymbols.add(ch);
      increment(symbols,ch);
    }
 else     if ((ch == '\r' || ch == '\n' || ch == normalizedNewLine) && symbols.size() > 0) {
      afterNewLine=true;
      symbolsPerRow.add(symbols);
      if (symbolsPerRow.size() == MAX_ROW_SAMPLES) {
        break;
      }
      symbols=new HashMap<Character,Integer>();
    }
  }
  if (length >= characters.length && i >= length && symbolsPerRow.size() > 1) {
    symbolsPerRow.remove(symbolsPerRow.size() - 1);
  }
  Map<Character,Integer> totals=calculateTotals(symbolsPerRow);
  Map<Character,Integer> sums=new HashMap<Character,Integer>();
  Set<Character> toRemove=new HashSet<Character>();
  for (  Map<Character,Integer> previous : symbolsPerRow) {
    for (    Map<Character,Integer> current : symbolsPerRow) {
      for (      Character symbol : allSymbols) {
        Integer previousCount=previous.get(symbol);
        Integer currentCount=current.get(symbol);
        if (previousCount == null && currentCount == null) {
          toRemove.add(symbol);
        }
        if (previousCount == null || currentCount == null) {
          continue;
        }
        increment(sums,symbol,Math.abs(previousCount - currentCount));
      }
    }
  }
  sums.keySet().removeAll(toRemove);
  char delimiterMax=max(sums,totals,suggestedDelimiter);
  char delimiterMin=min(sums,totals,suggestedDelimiter);
  char delimiter;
  out:   if (delimiterMax != delimiterMin) {
    if (sums.get(delimiterMin) == 0 && sums.get(delimiterMax) != 0) {
      delimiter=delimiterMin;
      break out;
    }
    if (totals.get(delimiterMin) > totals.get(delimiterMax)) {
      delimiter=delimiterMin;
      break out;
    }
    delimiter=delimiterMax;
  }
 else {
    delimiter=delimiterMax;
  }
  char quote=doubleQuoteCount >= singleQuoteCount ? '"' : '\'';
  escape.remove(delimiter);
  char quoteEscape=max(escape,totals,quote);
  apply(delimiter,quote,quoteEscape);
}

Fixed version (ground truth):
@Override public void execute(char[] characters,int length){
  Set<Character> allSymbols=new HashSet<Character>();
  Map<Character,Integer> symbols=new HashMap<Character,Integer>();
  Map<Character,Integer> escape=new HashMap<Character,Integer>();
  List<Map<Character,Integer>> symbolsPerRow=new ArrayList<Map<Character,Integer>>();
  int doubleQuoteCount=0;
  int singleQuoteCount=0;
  int i;
  char inQuote='\0';
  boolean afterNewLine=true;
  for (i=0; i < length; i++) {
    char ch=characters[i];
    if (afterNewLine && ch == comment) {
      while (++i < length) {
        ch=characters[i];
        if (ch == '\r' || ch == '\n' || ch == normalizedNewLine) {
          break;
        }
      }
      continue;
    }
    if (ch == '"' || ch == '\'') {
      if (inQuote == ch) {
        if (ch == '"') {
          doubleQuoteCount++;
        }
 else {
          singleQuoteCount++;
        }
        if (i + 1 < length) {
          char next=characters[i + 1];
          if (Character.isLetterOrDigit(next) || (next <= ' ' && whitespaceRangeStart < next && next != '\n' && next != '\r')) {
            char prev=characters[i - 1];
            if (!Character.isLetterOrDigit(prev)) {
              increment(escape,prev);
            }
          }
        }
        inQuote='\0';
      }
 else       if (inQuote == '\0') {
        char prev='\0';
        int j=i;
        while (prev <= ' ' && --j >= 0) {
          prev=characters[j];
        }
        if (j < 0 || !Character.isLetterOrDigit(prev)) {
          inQuote=ch;
        }
      }
      continue;
    }
    if (inQuote != '\0') {
      continue;
    }
    afterNewLine=false;
    if (isSymbol(ch)) {
      allSymbols.add(ch);
      increment(symbols,ch);
    }
 else     if ((ch == '\r' || ch == '\n' || ch == normalizedNewLine) && symbols.size() > 0) {
      afterNewLine=true;
      symbolsPerRow.add(symbols);
      if (symbolsPerRow.size() == MAX_ROW_SAMPLES) {
        break;
      }
      symbols=new HashMap<Character,Integer>();
    }
  }
  if (symbols.size() > 0 && length < characters.length) {
    symbolsPerRow.add(symbols);
  }
  if (length >= characters.length && i >= length && symbolsPerRow.size() > 1) {
    symbolsPerRow.remove(symbolsPerRow.size() - 1);
  }
  Map<Character,Integer> totals=calculateTotals(symbolsPerRow);
  Map<Character,Integer> sums=new HashMap<Character,Integer>();
  Set<Character> toRemove=new HashSet<Character>();
  for (  Map<Character,Integer> previous : symbolsPerRow) {
    for (    Map<Character,Integer> current : symbolsPerRow) {
      for (      Character symbol : allSymbols) {
        Integer previousCount=previous.get(symbol);
        Integer currentCount=current.get(symbol);
        if (previousCount == null && currentCount == null) {
          toRemove.add(symbol);
        }
        if (previousCount == null || currentCount == null) {
          continue;
        }
        increment(sums,symbol,Math.abs(previousCount - currentCount));
      }
    }
  }
  sums.keySet().removeAll(toRemove);
  char delimiterMax=max(sums,totals,suggestedDelimiter);
  char delimiterMin=min(sums,totals,suggestedDelimiter);
  char delimiter;
  out:   if (delimiterMax != delimiterMin) {
    if (sums.get(delimiterMin) == 0 && sums.get(delimiterMax) != 0) {
      delimiter=delimiterMin;
      break out;
    }
    if (totals.get(delimiterMin) > totals.get(delimiterMax)) {
      delimiter=delimiterMin;
      break out;
    }
    delimiter=delimiterMax;
  }
 else {
    delimiter=delimiterMax;
  }
  char quote=doubleQuoteCount >= singleQuoteCount ? '"' : '\'';
  escape.remove(delimiter);
  char quoteEscape=max(escape,totals,quote);
  apply(delimiter,quote,quoteEscape);
}