I would like to have QMap as a part of class, so I add pointer to QMap in class private section, invoke a constructor of QMap in class constructor, and invoke destructor of QMap in class destructor. But if I invoke destructor of QMap, Segmentation fault is signaled. What do I wrong?

Qt Code: 
  1. #include <QtCore/QCoreApplication>
  2. #include <QMap>
  3. #include <QMutableMapIterator>
  4.  
  5. class Segment
  6. {
  7. public:
  8.     Segment(quint32 sourceIP, quint32 destinationIP,
  9.             quint32 sequenceNumber,const unsigned char *segment)
  10.     {
  11.         qDebug("%s",Q_FUNC_INFO);
  12.         srcIP=sourceIP;
  13.         dstIP=destinationIP;
  14.         seqNo=sequenceNumber;
  15.         data=segment;
  16.     };
  17.     ~Segment()
  18.     {
  19.         qDebug("%s",Q_FUNC_INFO);
  20.     };
  21.     quint32 srcIP;
  22.     quint32 dstIP;
  23.     quint32 seqNo;
  24. private:
  25.     const unsigned char *data;
  26. };
  27.  
  28. class Connection
  29. {
  30. public:
  31.     Connection(quint32 sourceIP, quint32 destinationIP)
  32.     {
  33.         qDebug("%s",Q_FUNC_INFO);
  34.         srcIP= sourceIP;
  35.         dstIP= destinationIP;
  36.         dstRCVMap= new QMap<quint32, Segment*>;
  37.     };
  38.     ~Connection()
  39.     {
  40.         qDebug("%s",Q_FUNC_INFO);
  41.         QMutableMapIterator<quint32, Segment*> mapIter2(*dstRCVMap);
  42.         while (mapIter2.hasNext()){
  43.             Segment *segment= mapIter2.next().value();
  44.             delete segment;
  45.             mapIter2.remove();
  46.         };
  47.         delete dstRCVMap;//Problem
  48.         qDebug("END OF %s",Q_FUNC_INFO);
  49.     };
  50.     void append(Segment *segment)
  51.     {
  52.         qDebug("%s",Q_FUNC_INFO);
  53.         if (segment->srcIP==srcIP && segment->dstIP==dstIP)
  54.             dstRCVMap->insert(segment->seqNo, segment);
  55.         else
  56.             delete segment;
  57.     };
  58. private:
  59.     quint32 srcIP;
  60.     quint32 dstIP;
  61.     QMap<quint32, Segment*> *dstRCVMap;
  62. };
  63.  
  64. int main(int argc, char *argv[])
  65. {
  66.     QCoreApplication a(argc, argv);
  67.     quint32 fakeIP1=123;
  68.     quint32 fakeIP2=456;
  69.     Connection con(fakeIP1,fakeIP2);
  70.     const unsigned char rawSegment[20]={0};
  71.     quint32 fakeSeqNo=1;
  72.     con.append(new Segment(fakeIP1,fakeIP2,fakeSeqNo,rawSegment));
  73. //    return a.exec();
  74. }
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