qvector.h, line 538: Out of memory, std::bad_alloc

[HappyCoder]

Hi,
we provide a software for our customers that can show either a graph or a table with
the measured values at a specific time. When i have big data and switch to table view
our software crashed with the message:

In file ..\..\include/QtCore/../../src/corelib/tools/qvector.h, line 538: Out of memory
Invalid parameter passed to C runtime function.
Invalid parameter passed to C runtime function.
exited with code 3

In file ..\..\include/QtCore/../../src/corelib/tools/qvector.h, line 538: Out of memory
Invalid parameter passed to C runtime function.
Invalid parameter passed to C runtime function.
exited with code 3

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Our software crashes (Release) at around 1,8 GB memory usage (from Windows 7 task manager).

qvector.h (Qt 5.6.2)

template <typename T>
void QVector<T>::reallocData(const int asize, const int aalloc, QArrayData::AllocationOptions options)
{
    Q_ASSERT(asize >= 0 && asize <= aalloc);
    Data *x = d;
 
    const bool isShared = d->ref.isShared();
 
    if (aalloc != 0) {
        if (aalloc != int(d->alloc) || isShared) {
            QT_TRY {
                // allocate memory
                x = Data::allocate(aalloc, options);
                Q_CHECK_PTR(x);   // THIS IS LINE 538

template <typename T>
void QVector<T>::reallocData(const int asize, const int aalloc, QArrayData::AllocationOptions options)
{
    Q_ASSERT(asize >= 0 && asize <= aalloc);
    Data *x = d;

    const bool isShared = d->ref.isShared();

    if (aalloc != 0) {
        if (aalloc != int(d->alloc) || isShared) {
            QT_TRY {
                // allocate memory
                x = Data::allocate(aalloc, options);
                Q_CHECK_PTR(x);   // THIS IS LINE 538

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and this is the code to fill the table

for(int u=itemList.at(i)->idx;u<itemList.at(i)->mData->values.size();u++){
 
                if(ui->tableWidget->rowCount() < u+1)
                    ui->tableWidget->setRowCount(u+1);
 
                QTableWidgetItem* itemt = new QTableWidgetItem(loc.toString(itemList.at(i)->mData->timestamps.at(u)));
                itemt->setTextColor(itemList.at(i)->color);
                ui->tableWidget->setItem(u,(i+1)*2-2,itemt);
 
                QString tmp;
                if(itemList.at(i)->mData->errorFlag.length() > u){
                    if(itemList.at(i)->mData->errorFlag.at(u) == 0){
 
                        tmp = loc.toString(itemList.at(i)->mData->values.at(u)*setManager->getPressureFactor());
                    }
                    else if(itemList.at(i)->mData->errorFlag.at(u) & errflgUR) // Error UR
                        tmp  = tr("Underrange");
                    else if(itemList.at(i)->mData->errorFlag.at(u) & errflgOR) // Error OR
                        tmp  = tr("Overrange");
                    else if(itemList.at(i)->mData->errorFlag.at(u) & errflgSEDIS ) // Error SEDIS
                        tmp = tr("Sensor disabled");
                }
 
                QTableWidgetItem* itemp = new QTableWidgetItem(tmp);
                itemp->setTextColor(itemList.at(i)->color);
                ui->tableWidget->setItem(u,(i+1)*2-1,itemp);
 
                itemList.at(i)->idx = u;
            }

for(int u=itemList.at(i)->idx;u<itemList.at(i)->mData->values.size();u++){

                if(ui->tableWidget->rowCount() < u+1)
                    ui->tableWidget->setRowCount(u+1);

                QTableWidgetItem* itemt = new QTableWidgetItem(loc.toString(itemList.at(i)->mData->timestamps.at(u)));
                itemt->setTextColor(itemList.at(i)->color);
                ui->tableWidget->setItem(u,(i+1)*2-2,itemt);

                QString tmp;
                if(itemList.at(i)->mData->errorFlag.length() > u){
                    if(itemList.at(i)->mData->errorFlag.at(u) == 0){

                        tmp = loc.toString(itemList.at(i)->mData->values.at(u)*setManager->getPressureFactor());
                    }
                    else if(itemList.at(i)->mData->errorFlag.at(u) & errflgUR) // Error UR
                        tmp  = tr("Underrange");
                    else if(itemList.at(i)->mData->errorFlag.at(u) & errflgOR) // Error OR
                        tmp  = tr("Overrange");
                    else if(itemList.at(i)->mData->errorFlag.at(u) & errflgSEDIS ) // Error SEDIS
                        tmp = tr("Sensor disabled");
                }

                QTableWidgetItem* itemp = new QTableWidgetItem(tmp);
                itemp->setTextColor(itemList.at(i)->color);
                ui->tableWidget->setItem(u,(i+1)*2-1,itemp);

                itemList.at(i)->idx = u;
            }

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Has someone any idea to improve our code or any other help is welcome?
HappyCoder

[high_flyer]

What did you try so far?
For example, did you try to run it with a small test data set?
If you run a debug build in a debugger, does it behave differently i.e doesn't crash, or crashes somewhere else?
If it still crashes while in debugger, have a look at the calls stack, and trace the last call in your own code, see if you get clues there.
Also, make sure you are not having an endless recursion, which also could crash with alloc memory errors.