Comment 17 for bug 1378627

Sorry, I printed the wrong attachment, but it's almost the same :
(gdb) p *(struct intel_renderbuffer *)(brw->ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer)
$1 = {Base = {Base = {Mutex = {__data = {__lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, __spins = 0, __elision = 0, __list = {__prev = 0x0, __next = 0x0}},
        __size = '\000' <repeats 39 times>, __align = 0}, ClassID = 305419896, Name = 0, Label = 0x0, RefCount = 1, Width = 0, Height = 0, Depth = 0, Purgeable = 0 '\000',
      AttachedAnytime = 0 '\000', NeedsFinishRenderTexture = 0 '\000', NumSamples = 0 '\000', InternalFormat = 6401, _BaseFormat = 6401, Format = MESA_FORMAT_S_UINT8, TexImage = 0x0, Delete =
    0x7f044aa94240 <intel_delete_renderbuffer>, AllocStorage = 0x7f044aa95480 <intel_alloc_private_renderbuffer_storage>}, Buffer = 0x0, Map = 0x0, RowStride = 0, ColorType = 0}, mt = 0x0,
  singlesample_mt = 0x0, mt_level = 0, mt_layer = 0, layer_count = 1, draw_x = 0, draw_y = 0, need_downsample = false, need_map_upsample = false, singlesample_mt_is_tmp = false}