0x0000000000517828 in DrawingContext::draw_gradient (this=0x7fffff877bb0, request=@0xc81b30) at src/video/drawing_context.cpp:375
375       glColor4f(top.red, top.green, top.blue, top.alpha);
(gdb) bt
#0  0x0000000000517828 in DrawingContext::draw_gradient (this=0x7fffff877bb0, request=@0xc81b30) at src/video/drawing_context.cpp:375
#1  0x0000000000519da7 in DrawingContext::handle_drawing_requests (this=0x7fffff877bb0, requests=@0x7fffff877c10) at src/video/drawing_context.cpp:554
#2  0x0000000000519fef in DrawingContext::do_drawing (this=0x7fffff877bb0) at src/video/drawing_context.cpp:474
#3  0x000000000041fc96 in MainLoop::draw (this=0x994150, context=@0x7fffff877bb0) at src/mainloop.cpp:149
#4  0x0000000000420983 in MainLoop::run (this=0x994150) at src/mainloop.cpp:271
#5  0x000000000041885c in main (argc=2, argv=0x7fffff877f18) at src/main.cpp:615
(gdb) bt full
#0  0x0000000000517828 in DrawingContext::draw_gradient (this=0x7fffff877bb0, request=@0xc81b30) at src/video/drawing_context.cpp:375
        gradientrequest = (const GradientRequest *) 0x1b
        top = (const Color &) @0x1b: Cannot access memory at address 0x1b