OpenGL memory leak on Nvidia card

Gaming and Visualization Technologies APIs OpenGL
1

Hi
I’am programming multiple window application with two threads. First is render thread and the second is GUI. There is only one opengl context on render thread. On integrated card everything is correct, but on nvidia there is huge memory leak when I create and close window.

Render:

mWindowsCriticalSection.enter();
   for (auto window : mWindows)
   {
       wglMakeCurrent(window.second->getHdc(), mContext);
      //only swap buffers 
      SwapBuffers(window.second->getHdc());
       wglMakeCurrent(0, 0);
   }
   mWindowsCriticalSection.leave();

Window creation:

mHwnd = CreateWindow(
       WINDOW_CLASS, mTitle.c_str(),
       WS_OVERLAPPEDWINDOW,
       400, 400,
       400, 400, NULL, NULL,
       GetModuleHandle(NULL), NULL);
   SetWindowLong(mHwnd, GWLP_USERDATA, (long)this);
   mHdc = GetDC(mHwnd);
   PIXELFORMATDESCRIPTOR pfd;
   int pixelFormat = Renderer::getInstance().getPixelFormat();
   DescribePixelFormat(mHdc, pixelFormat, sizeof(pfd), &pfd);
   SetPixelFormat(mHdc, pixelFormat, &pfd);
   WindowsContainer::getInstance().addWindow(shared_from_this());

In WM_DESTROY:

ReleaseDC(mHwnd, mHdc);

This memory leak causes DrvPresentBuffers crash after 20-30 creations and destroys of window.

Any ideas?