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Thread: Memcheck showing issues for external errors and Leaks.

  1. #1
    Join Date
    Apr 2017
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    Default Memcheck showing issues for external errors and Leaks.

    On running memcheck for the following code:

    Qt Code:
    1. #include <QApplication>
    2. #include <QPushButton>
    3.  
    4. int main(int argc, char *argv[])
    5. {
    6. QApplication app(argc, argv);
    7. QWidget window;
    8.  
    9. window.resize(600, 600);
    10. QPushButton button(&window);
    11. window.show();
    12.  
    13. return app.exec();
    14. }
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    These errors are obtained on checking the external error flag for memcheck:

    Qt Code:
    1. Syscall param writev(vector[...]) points to uninitialised byte(s)
    2. Address 0xcc7be09 is 4,537 bytes inside a block of size 21,152 alloc'd 1: calloc in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so
    3. Uninitialised value was created by a stack allocation 1: non-virtual thunk to QXcbWindow::setVisible(bool) in /home/captaindavinci/Qt/5.8/gcc_64/lib/libQt5XcbQpa.so.5.8.0
    4.  
    5. Location is main.cpp: 7
    6. and so on..
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  2. #2
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    Default Re: Memcheck showing issues for external errors and Leaks.

    And so is there a question here (and so on)?
    <=== The Great Pumpkin says ===>
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

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