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  1. Qt
  2. QTBUG-91801

Potential memory leak in sending queued signals?

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P1: Critical
    • Resolution: Done
    • Affects Version/s: 6.1.0
    • Fix Version/s: 6.0.4, 6.1.0, 6.1, 6.2
    • Component/s: Core: Event loop
    • Labels:
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      Description

      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.

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              Assignee:
              agolubev Andrei Golubev
              Reporter:
              mlangen Marc Langenbach
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                Updated:
                Resolved:

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