# QVTKOpenGLNativeWidget crash when using Mesa
**URL:** https://discourse.vtk.org/t/qvtkopenglnativewidget-crash-when-using-mesa/8283
**Category:** Support
**Created:** [April 12, 2022, 2:16pm UTC](https://discourse.vtk.org/t/qvtkopenglnativewidget-crash-when-using-mesa/8283 "2022-04-12T14:16:42Z")
**Posts on this page:** 1
**Page:** 1
### Author:  [@andra](https://discourse.vtk.org/u/andra)
#### Post date: [April 12, 2022, 2:16pm UTC](https://discourse.vtk.org/t/qvtkopenglnativewidget-crash-when-using-mesa/8283/1 "2022-04-12T14:16:42Z")
Hello,
I have a problem with QVTKOpenGLNativeWidget when using software rendering mode. The application crashes when widget-\>show() is called.
I am using vtk 9.0.1 with Qt6 ( 6.2.4) and Mesa driver 22.0 ([Releases · pal1000/mesa-dist-win · GitHub](https://github.com/pal1000/mesa-dist-win/releases)).
This minimal example illustrates the problem:
#include \
#include
#include \
VTK\_MODULE\_INIT( vtkRenderingOpenGL2 )
VTK\_MODULE\_INIT( vtkRenderingContextOpenGL2 )
#include \
#include \
int main( int argc, char\*\* argv ) {
```
SetEnvironmentVariableW( L"gallium_driver", L"llvmpipe" );
SetEnvironmentVariableW( L"QT_LOGGING_RULES", L"qt.qpa.gl=true" );
//when setting this to false, it works without problems
QCoreApplication::setAttribute( Qt::AA_UseSoftwareOpenGL, true );
auto format = QVTKOpenGLNativeWidget::defaultFormat();
QSurfaceFormat::setDefaultFormat( format );
QApplication app( argc, argv );
auto* qvtkWidget_ = new QVTKOpenGLNativeWidget();
qvtkWidget_->show(); // crashes here
std::cout << "Window is ready to render " << std::boolalpha << qvtkWidget_->isValid();
qvtkWidget_->close();
delete qvtkWidget_;
return EXIT_SUCCESS;
```
}
Any help would be very appreciated.
Output from qt.qpa.gl:
Crash
