Raw OpenGL not working in QOpenGLWidget with QT 5.11

Hello All:
As before we're working on QT 5.6 with QOpenGLWigdget, and call raw OpenGL API inside it

Code:

---

SummWidget::initializeGL()
{
     initializeOpenGLFunctions();
 
     // do call raw openGL API
}
void SummWidget::paintGL()
{
     // do call raw opengl API
}

---

It works well, but when we upgrade to QT 5.11, there is no render image show on QT(QT works well), and GPU is working.
and we tried that

Code:

---

GLuint LoadShader ( GLenum type, const char *shaderSrc )
{
   GLuint shader;
   GLint compiled;
 
   // Create the shader object
   shader = glCreateShader ( type );
 
   if ( shader == 0 )
    return 0;
 
   // Load the shader source
   glShaderSource ( shader, 1, &shaderSrc, NULL );
 
   // Compile the shader
   glCompileShader ( shader );
 
   // Check the compile status
   glGetShaderiv ( shader, GL_COMPILE_STATUS, &compiled );
 
   if ( !compiled ) 
   {
      GLint infoLen = 0;
 
      glGetShaderiv ( shader, GL_INFO_LOG_LENGTH, &infoLen );
 
      if ( infoLen > 1 )
      {
         char* infoLog = (char* )malloc (sizeof(char) * infoLen );
 
         glGetShaderInfoLog ( shader, infoLen, NULL, infoLog );
         printf ( "Error compiling shader:\n%s\n", infoLog );            
 
         free ( infoLog );
      }
 
      glDeleteShader ( shader );
      return 0;
   }
 
   return shader;
 
}
void TestDraw()
{
 
       GLfloat vVertices[] = {  0.0f,  0.5f, 0.0f, 
                           -0.5f, -0.5f, 0.0f,
                            0.5f, -0.5f, 0.0f };
 
   // Set the viewport
   glViewport ( 0, 0, 670, 720 );
 
   // Clear the color buffer
   glClear ( GL_COLOR_BUFFER_BIT );
 
   // Use the program object
   glUseProgram (programObject );
 
   // Load the vertex data
   glVertexAttribPointer ( 0, 3, GL_FLOAT, GL_FALSE, 0, vVertices );
   glEnableVertexAttribArray ( 0 );
 
   glDrawArrays ( GL_TRIANGLES, 0, 3 );
 
}

---

call the TestDraw() in paintGL(), then we can see a red triangle if remove the legacy raw opengl code.
if put them together,nothing show up event put the TestDraw() at the end.
Any suggestion? Thanks