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  1. Qt
  2. QTBUG-31354

XCB: QApplication crashes when there is no monitor connected using QT5

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P2: Important P2: Important
    • 5.6.0
    • 5.0.0, 5.2.0
    • GUI: Window management
    • None
    • CentOS 6.4 or 6.5, Qt 5.02 or 5.2.0, Qt Creator 2.7.1 or 3.0.0

      When I start the application on a headless machine, as some of our servers do not have monitors, the application crashes. I use teamviewer/vnc to graphically access these servers. Starting from:

      QApplication a(argc, argv);

      I have tracked this down to a core file call qxcbconnection.cpp and the line:

      xcb_create_window(m_connection, XCB_COPY_FROM_PARENT,
                  m_connectionEventListener, m_screens.at(0)->root(),
                  0, 0, 1, 1, 0, XCB_WINDOW_CLASS_INPUT_ONLY,
                  m_screens.at(0)->screen()->root_visual, 0, 0);

      The problem is, if there is no monitor connected, then m_screens is empty, and therefore causes an “index out of bounds” error.

        1. freenx-gdb-qtcreator.txt
          6 kB
        2. freenx-xdpyinfo-all.txt
          8 kB
        3. local-xdpyinfo-all.txt
          23 kB
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            srutledg Shawn Rutledge
            simy307 Brian Simonson
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              Created:
              Updated:
              Resolved:

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