Qt notify badalloc

[Sacha_D]

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:

Local variables     
    e       std::bad_alloc &
        [std::exception]        std::exception
            [vptr]  0x1885b48   
                [0] 0x17b3770 <std::bad_alloc::~bad_alloc()>    
                [1] 0x17b3748 <std::bad_alloc::~bad_alloc()>    
                [2] 0x17b3688 <std::bad_alloc::what() const>    
    event    @0x1928dea8    QEvent
        [vptr]  0x18854c8   
            [0] 0x16e90e8 <QEvent::~QEvent()>   
            [1] 0x16e9138 <QEvent::~QEvent()>   
        d   0x0 QEventPrivate *
        m_accept    1   ushort
        posted  0   ushort
        reserved    0   ushort
        spont   0   ushort
        t   50  ushort
    receiver        QReadNotifier
        [QSocketNotifier]       QSocketNotifier
            [QObject]       QObject
            snenabled   true    bool
            sntype  QSocketNotifier::Read (0)   QSocketNotifier::Type
            sockfd  1404    int
        engine   @0x193a21d0    QNativeSocketEngine
            [QAbstractSocketEngine]     QAbstractSocketEngine
                [QObject]       QObject
                    [vptr]  0x680fbc88  
                    d_ptr    @0x193a21d4    QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>>
                        [QAbstractSocketEnginePrivate]      QAbstractSocketEnginePrivate
                            [QObjectPrivate]        QObjectPrivate
                                [QObjectData]       QObjectData
                                connectedSignals    @0x1bfc6344 quint32 [2]
                                    [0] 0   quint32
                                    [1] 0   quint32
                                connectionLists 0x0 QObjectConnectionListVector *
                                currentChildBeingDeleted    0x0 QObject *
                                currentSender   0x0 QObjectPrivate::Sender *
                                declarativeData 0x0 QAbstractDeclarativeData *
                                eventFilters    <0 элементов>   QList<QPointer<QObject>>
                                extraData    @0x1c60f8a0    QObjectPrivate::ExtraData
                                    propertyNames   <0 элементов>   QList<QByteArray>
                                    propertyValues  <0 элементов>   QList<QVariant>
                                    userData    <0 элементов>   QVector<QObjectUserData*>
                                objectName  ""  QString
                                pendingChildInsertedEvents  <0 элементов>   QVector<QWeakPointer<QObject>>
                                senders 0x0 QObjectPrivate::Connection *
                                sharedRefcount      QAtomicPointer<QtSharedPointer::ExternalRefCountData>
                                threadData   @0x1858f3f8    QThreadData
                            hasSetSocketError   false   bool
                            localAddress    127.0.0.1   QHostAddress
                            localPort   28911   quint16
                            peerAddress 127.0.0.1   QHostAddress
                            peerPort    56626   quint16
                            receiver        QTcpSocketPrivate
                            socketError QAbstractSocket::UnknownSocketError (-1)    QAbstractSocket::SocketError
                            socketErrorString   "Unknown error" QString
                            socketProtocol  QAbstractSocket::IPv4Protocol (0)   QAbstractSocket::NetworkLayerProtocol
                            socketState QAbstractSocket::ConnectedState (3) QAbstractSocket::SocketState
                            socketType  QAbstractSocket::TcpSocket (0)  QAbstractSocket::SocketType
                        exceptNotifier  0x0 QSocketNotifier *
                        readNotifier        QReadNotifier
                        socketDescriptor    1404    int
                        winSock     QWindowsSockInit
                        writeNotifier       QWriteNotifier
                            [QSocketNotifier]       QSocketNotifier
                            engine   @0x193a21d0    QNativeSocketEngine
    str "Error std::bad_alloc sending event 6QEvent to object  (13QReadNotifier)
    this    "QDevicesRunTester" @0x22fe0c   QDevicesRunTestApplication

Local variables     
    e       std::bad_alloc &
        [std::exception]        std::exception
            [vptr]  0x1885b48   
                [0] 0x17b3770 <std::bad_alloc::~bad_alloc()>    
                [1] 0x17b3748 <std::bad_alloc::~bad_alloc()>    
                [2] 0x17b3688 <std::bad_alloc::what() const>    
    event    @0x1928dea8    QEvent
        [vptr]  0x18854c8   
            [0] 0x16e90e8 <QEvent::~QEvent()>   
            [1] 0x16e9138 <QEvent::~QEvent()>   
        d   0x0 QEventPrivate *
        m_accept    1   ushort
        posted  0   ushort
        reserved    0   ushort
        spont   0   ushort
        t   50  ushort
    receiver        QReadNotifier
        [QSocketNotifier]       QSocketNotifier
            [QObject]       QObject
            snenabled   true    bool
            sntype  QSocketNotifier::Read (0)   QSocketNotifier::Type
            sockfd  1404    int
        engine   @0x193a21d0    QNativeSocketEngine
            [QAbstractSocketEngine]     QAbstractSocketEngine
                [QObject]       QObject
                    [vptr]  0x680fbc88  
                    d_ptr    @0x193a21d4    QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>>
                        [QAbstractSocketEnginePrivate]      QAbstractSocketEnginePrivate
                            [QObjectPrivate]        QObjectPrivate
                                [QObjectData]       QObjectData
                                connectedSignals    @0x1bfc6344 quint32 [2]
                                    [0] 0   quint32
                                    [1] 0   quint32
                                connectionLists 0x0 QObjectConnectionListVector *
                                currentChildBeingDeleted    0x0 QObject *
                                currentSender   0x0 QObjectPrivate::Sender *
                                declarativeData 0x0 QAbstractDeclarativeData *
                                eventFilters    <0 элементов>   QList<QPointer<QObject>>
                                extraData    @0x1c60f8a0    QObjectPrivate::ExtraData
                                    propertyNames   <0 элементов>   QList<QByteArray>
                                    propertyValues  <0 элементов>   QList<QVariant>
                                    userData    <0 элементов>   QVector<QObjectUserData*>
                                objectName  ""  QString
                                pendingChildInsertedEvents  <0 элементов>   QVector<QWeakPointer<QObject>>
                                senders 0x0 QObjectPrivate::Connection *
                                sharedRefcount      QAtomicPointer<QtSharedPointer::ExternalRefCountData>
                                threadData   @0x1858f3f8    QThreadData
                            hasSetSocketError   false   bool
                            localAddress    127.0.0.1   QHostAddress
                            localPort   28911   quint16
                            peerAddress 127.0.0.1   QHostAddress
                            peerPort    56626   quint16
                            receiver        QTcpSocketPrivate
                            socketError QAbstractSocket::UnknownSocketError (-1)    QAbstractSocket::SocketError
                            socketErrorString   "Unknown error" QString
                            socketProtocol  QAbstractSocket::IPv4Protocol (0)   QAbstractSocket::NetworkLayerProtocol
                            socketState QAbstractSocket::ConnectedState (3) QAbstractSocket::SocketState
                            socketType  QAbstractSocket::TcpSocket (0)  QAbstractSocket::SocketType
                        exceptNotifier  0x0 QSocketNotifier *
                        readNotifier        QReadNotifier
                        socketDescriptor    1404    int
                        winSock     QWindowsSockInit
                        writeNotifier       QWriteNotifier
                            [QSocketNotifier]       QSocketNotifier
                            engine   @0x193a21d0    QNativeSocketEngine
    str "Error std::bad_alloc sending event 6QEvent to object  (13QReadNotifier)
    this    "QDevicesRunTester" @0x22fe0c   QDevicesRunTestApplication

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[wysota]

What memory leak do you mean? What does bad alloc have to do with memory leaks?

[Sacha_D]

I mean that memory usage of appliacation in Windows task manager only increasing. It starts from 53 mb and when it become about 1 GB I get this crash.

[wysota]

So fix your code, I still fail to see any relation with exceptions. The problem is not when allocation fails but much earlier when you don't free memory you don't use.

[Sacha_D]

What kind of problem I need to looking for? New/delete - ok. I don't overload events. For intercation between threads I use only signals and slots.

[wysota]

There is no point in guessing. Either use a memory profiler or analyze your code for allocated data you do not need. Be sure to use proper tools, Windows task manager is not a reliable tool for tracking memory consumption.