In my application, I called a Google library 's login function, it's in anotherthread, and after I get the response of login, the application seems freeze. I use gdb to get the following stack info , some body please help me know what's the meaning of it, how does it happen
Qt Code: 
  1. #0 0x414d34d4 in QMetaObject::cast(QObject*) const () 
  2. from /opt/Qt/lib/libQtCore.so.4 
  3. #1 0x40891298 in QWidgetPrivate::paintBackground(QPainter*, QRegion const&, int) const () from /opt/Qt/lib/libQtGui.so.4 
  4. #2 0x4089c4bc in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () 
  5. from /opt/Qt/lib/libQtGui.so.4 
  6. #3 0x4089cd40 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  7. #4 0x4089cbe4 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  8. #5 0x4089cbe4 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  9. #6 0x4089cbe4 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  10. #7 0x4089cbe4 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  11. #8 0x4089cbe4 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  12. #9 0x4089cbe4 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  13. #10 0x4089cbe4 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  14. #11 0x4089cbe4 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  15. #12 0x4089cbe4 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  16. #13 0x4089cbe4 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /opt/Qt/lib/libQtGui.so.4 
  17. #14 0x4089c1f4 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () 
  18. from /opt/Qt/lib/libQtGui.so.4 
  19. #15 0x40a9e040 in QWidgetBackingStore::sync() () 
  20. from /opt/Qt/lib/libQtGui.so.4 
  21. #16 0x4088ccd4 in QWidgetPrivate::syncBackingStore() () 
  22. from /opt/Qt/lib/libQtGui.so.4 
  23. #17 0x4089de10 in QWidget::event(QEvent*) () from /opt/Qt/lib/libQtGui.so.4 
  24. #18 0x40d0c270 in QFrame::event(QEvent*) () from /opt/Qt/lib/libQtGui.so.4 
  25. #19 0x40d7aa04 in QStackedWidget::event(QEvent*) () 
  26. from /opt/Qt/lib/libQtGui.so.4 
  27. #20 0x40839d70 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () 
  28. from /opt/Qt/lib/libQtGui.so.4 
  29. #21 0x4083f438 in QApplication::notify(QObject*, QEvent*) () 
  30. from /opt/Qt/lib/libQtGui.so.4 
  31. #22 0x414cbd00 in QCoreApplication::notifyInternal(QObject*, QEvent*) () 
  32. from /opt/Qt/lib/libQtCore.so.4 
  33. #23 0x414cd070 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /opt/Qt/lib/libQtCore.so.4 
  34. #24 0x00000000 in ?? ()
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