.
Thread 1 (process 2657):
#0  QGtkStyle::drawControl (this=0x235dbf0, 
    element=QStyle::CE_PushButtonBevel, option=0x7ffffbd82220, 
    painter=0x7ffffbd82310, widget=0x23ba5f0)
    at ../../include/QtCore/../../src/corelib/tools/qstring.h:680
	style = <value optimized out>
	gtkPainter = Cannot access memory at address 0x7ffffbd80b80