I have a multithreaded application. I don't use iterational dynamic memory allocation (new/delete). Already I overloaded global new/delete and knew, that there are no memory leaks in cause of them. This app is eating memeory well and when it crashes (I reimplemented QApplication and notify() into it to catch exceptions) I got badalloc from QAbstractSocket. How to understand and correct memory leak. (Is there a notify overflow and why memory not released?) Where is the reason of this hell? Thank you for any help. I don't know what to do.

Here is last data from debugger:

Qt Code: 
  1. Local variables     
  2.     e       std::bad_alloc &
  3.         [std::exception]        std::exception
  4.             [vptr]  0x1885b48   
  5.                 [0] 0x17b3770 <std::bad_alloc::~bad_alloc()>    
  6.                 [1] 0x17b3748 <std::bad_alloc::~bad_alloc()>    
  7.                 [2] 0x17b3688 <std::bad_alloc::what() const>    
  8.     event    @0x1928dea8    QEvent
  9.         [vptr]  0x18854c8   
  10.             [0] 0x16e90e8 <QEvent::~QEvent()>   
  11.             [1] 0x16e9138 <QEvent::~QEvent()>   
  12.         d   0x0 QEventPrivate *
  13.         m_accept    1   ushort
  14.         posted  0   ushort
  15.         reserved    0   ushort
  16.         spont   0   ushort
  17.         t   50  ushort
  18.     receiver        QReadNotifier
  21.             snenabled   true    bool
  22.             sntype  QSocketNotifier::Read (0)   QSocketNotifier::Type
  23.             sockfd  1404    int
  24.         engine   @0x193a21d0    QNativeSocketEngine
  25.             [QAbstractSocketEngine]     QAbstractSocketEngine
  27.                     [vptr]  0x680fbc88  
  28.                     d_ptr    @0x193a21d4    QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>>
  29.                         [QAbstractSocketEnginePrivate]      QAbstractSocketEnginePrivate
  30.                             [QObjectPrivate]        QObjectPrivate
  31.                                 [QObjectData]       QObjectData
  32.                                 connectedSignals    @0x1bfc6344 quint32 [2]
  33.                                     [0] 0   quint32
  34.                                     [1] 0   quint32
  35.                                 connectionLists 0x0 QObjectConnectionListVector *
  36.                                 currentChildBeingDeleted    0x0 QObject *
  37.                                 currentSender   0x0 QObjectPrivate::Sender *
  38.                                 declarativeData 0x0 QAbstractDeclarativeData *
  39.                                 eventFilters    <0 элементов>   QList<QPointer<QObject>>
  40.                                 extraData    @0x1c60f8a0    QObjectPrivate::ExtraData
  41.                                     propertyNames   <0 элементов>   QList<QByteArray>
  42.                                     propertyValues  <0 элементов>   QList<QVariant>
  43.                                     userData    <0 элементов>   QVector<QObjectUserData*>
  44.                                 objectName  ""  QString
  45.                                 pendingChildInsertedEvents  <0 элементов>   QVector<QWeakPointer<QObject>>
  46.                                 senders 0x0 QObjectPrivate::Connection *
  47.                                 sharedRefcount      QAtomicPointer<QtSharedPointer::ExternalRefCountData>
  48.                                 threadData   @0x1858f3f8    QThreadData
  49.                             hasSetSocketError   false   bool
  50.                             localAddress    127.0.0.1   QHostAddress
  51.                             localPort   28911   quint16
  52.                             peerAddress 127.0.0.1   QHostAddress
  53.                             peerPort    56626   quint16
  54.                             receiver        QTcpSocketPrivate
  55.                             socketError QAbstractSocket::UnknownSocketError (-1)    QAbstractSocket::SocketError
  56.                             socketErrorString   "Unknown error" QString
  57.                             socketProtocol  QAbstractSocket::IPv4Protocol (0)   QAbstractSocket::NetworkLayerProtocol
  58.                             socketState QAbstractSocket::ConnectedState (3) QAbstractSocket::SocketState
  59.                             socketType  QAbstractSocket::TcpSocket (0)  QAbstractSocket::SocketType
  60.                         exceptNotifier  0x0 QSocketNotifier *
  61.                         readNotifier        QReadNotifier
  62.                         socketDescriptor    1404    int
  63.                         winSock     QWindowsSockInit
  64.                         writeNotifier       QWriteNotifier
  66.                             engine   @0x193a21d0    QNativeSocketEngine
  67.     str "Error std::bad_alloc sending event 6QEvent to object  (13QReadNotifier)
  68.     this    "QDevicesRunTester" @0x22fe0c   QDevicesRunTestApplication
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