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  1. Qt
  2. QTBUG-61463

Multiple events emitted from a single object in different thread cause NullPointer exception in QStateMachinePrivate

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.9.4
    • 5.8.0
    • Core: State Machine
    • None
    • Linux Ubuntu 16.04, MacOS El Capitan.
    • 345be581007c05164052e27f90fcfaf27a41c743

    Description

      A simple scenario.

       

      State machine s1->final_State

      With transition from an object that lives in a different thread.

      If the objects emits a signal multiple times, the first one is consumed correctly. The second one causes core dump since sender is NULL in QStateMachinePrivate::handleTransitionSignal.

       

      MWE project is in attachment. Just click on the button.

      Attachments

        1. emitter.cpp
          0.1 kB
          Pavle Boskoski
        2. emitter.h
          0.2 kB
          Pavle Boskoski
        3. main.cpp
          3 kB
          Pavle Boskoski
        4. pp.pro
          0.4 kB
          Pavle Boskoski
        5. win.cpp
          0.5 kB
          Pavle Boskoski
        6. win.h
          0.3 kB
          Pavle Boskoski
        7. workerth.cpp
          0.4 kB
          Pavle Boskoski
        8. workerth.h
          0.4 kB
          Pavle Boskoski
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          People

            jefernan Jesus Fernandez
            pavleb Pavle Boskoski
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            Dates

              Created:
              Updated:
              Resolved:

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