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  1. Qt
  2. QTBUG-12025

Crash in QGestureManager::instance()

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P1: Critical
    • Resolution: Done
    • Affects Version/s: 4.7.0
    • Fix Version/s: 4.7.0
    • Labels:
      None
    • Commits:
      475a3c275ba173cb130a838b6053cb45d405887e 1e9a92cd6e8670a9dc90fed2044e7de38a3b13e6

      Description

      In QGestureManager::instance() it accesses the QApplicationPrivate::instance() data structure without making sure it is non-null. I have seen KDE applications crashing when widgets are deleted during application exit:

      Thread 1 (Thread 0xb492e930 (LWP 10782)):
      [KCrash Handler]
      #7 QGestureManager::instance () at /local/git/Qt/qt/src/gui/kernel/qapplication.cpp:5790
      #8 0xb68d500a in QWidget::ungrabGesture (this=0x81ee8f8, gesture=Qt::PanGesture) at /local/git/Qt/qt/src/gui/kernel/qwidget.cpp:12050
      #9 0xb68d533f in QWidget::~QWidget (this=0x81ee8f8, __in_chrg=<value optimized out>) at /local/git/Qt/qt/src/gui/kernel/qwidget.cpp:1449
      #10 0xb68d5572 in QWidget::~QWidget (this=0x81ee8f8, __in_chrg=<value optimized out>) at /local/git/Qt/qt/src/gui/kernel/qwidget.cpp:1580
      #11 0xb6336487 in QObjectPrivate::deleteChildren (this=0x84c1500) at /local/git/Qt/qt/src/corelib/kernel/qobject.cpp:1949
      #12 0xb68d5289 in QWidget::~QWidget (this=0x8159718, __in_chrg=<value optimized out>) at /local/git/Qt/qt/src/gui/kernel/qwidget.cpp:1560
      #13 0xb6cccef1 in QFrame::~QFrame (this=0x8159718, __in_chrg=<value optimized out>) at /local/git/Qt/qt/src/gui/widgets/qframe.cpp:240
      #14 0xb6d5cd44 in QAbstractScrollArea::~QAbstractScrollArea (this=0x8159718, __in_chrg=<value optimized out>) at /local/git/Qt/qt/src/gui/widgets/qabstractscrollarea.cpp:521
      #15 0xb5ecc181 in Okteta::ColumnsView::~ColumnsView (this=0x8159718, __in_chrg=<value optimized out>) at /local/svn/kde/trunk/KDE/kdeutils/okteta/gui/libcolumnsview/columnsview.cpp:398

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            • Assignee:
              dzyubenk Denis Dzyubenko (Inactive)
              Reporter:
              cfeck Christoph Feck
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              Dates

              • Created:
                Updated:
                Resolved:

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