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  1. Qt
  2. QTBUG-91801

Potential memory leak in sending queued signals?

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    • Linux/X11

      With the introduction of Qt 6 we encountered a memory leak which seems to be caused by sending queued signals.

      I attached an example project along with a  heaptrack summary that points to some QByteArray reallocation when queued_activate for a signal is called.

      The sample project is quite simple: A producer generates some signals in a thread. These signals are connected as Qt::QueuedConnections to a slot of an object in the main thread.

      If I do something wrong in connection the thread please let me know

      Btw, I made the same test with Qt 5.15 and the memory usage was stable.

        For Gerrit Dashboard: QTBUG-91801
        # Subject Branch Project Status CR V

            agolubev Andrei Golubev
            mlangen Marc Langenbach
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