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  1. Qt
  2. QTBUG-106083

QFuture::then(QObject *context, Function &&function) throws "read access violation" when used in chained QFuture

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    • Windows
    • 8
    • 24dedaeaa1 (qt/qtbase/dev) ee349ffba0 (qt/qtbase/6.4) ee349ffba0 (qt/tqtc-qtbase/6.4) 24dedaeaa1 (qt/tqtc-qtbase/dev) 0006a401a4 (qt/tqtc-qtbase/6.2) 018d013181 (qt/qtbase/6.3) 018d013181 (qt/tqtc-qtbase/6.3)
    • Foundation Sprint 65, Foundation Sprint 66

      A chain like:

      #include <QCoreApplication>
#include <QtConcurrent>

int main(int argc, char* argv[]) 
{
    auto a = QCoreApplication(argc, argv);

    QObject obj(&a);

    QtConcurrent::run(
        [] { qDebug() << "block 0"; }
    ).then(
        [] { qDebug() << "block 1"; }
    ).then(
        &obj, [] { qDebug() << "block 2"; }
    );

    a.exec();
}

      Produces:

      block 0
block 1
Exception thrown: read access violation.
**_Mem** was 0xFFFFFFFFFFFFFFFF.

        

      The problem does not arise when the continuation "block 1" is removed.

       

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          Matias Simonetto
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            sonakur Sona Kurazyan
            matias.simon Matias Simonetto
            Vladimir Minenko Vladimir Minenko
            Alex Blasche Alex Blasche
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              Created:
              Updated:
              Resolved:

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