createDIB: CreateDIBSection failed.

Please i need your help!
i have 8 dockwidget in my Qmainwindow without a centralwidget, when i try to move, float, and undock some docks the program crash with segmentation fault!
i'm ready for more informations , thanks a lot!

Errors:

In file ....\include/QtCore/../../src/corelib/global/qglobal.h, line 770: Out of memory
Invalid parameter passed to C runtime function.
Invalid parameter passed to C runtime function.
QWidget::repaint: Recursive repaint detected

createDIB: CreateDIBSection failed.
Invalid parameter passed to C runtime function.
Invalid parameter passed to C runtime function.
QWaitCondition: Destroyed while threads are still waiting