CUDA error at Mandelbrot.cpp:916

[blastwave]

The sample code for Mandelbrot has a bug at line 916 : 

t$ 
t$ ldd Mandelbrot
        linux-vdso.so.1 (0x00007ffc9f3f9000)
        libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007fdbf674e000)
        libglut.so.3 => /usr/lib/x86_64-linux-gnu/libglut.so.3 (0x00007fdbf6701000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fdbf66f7000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fdbf66d5000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fdbf66cf000)
        libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fdbf6502000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fdbf64e6000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fdbf6312000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fdbf68ba000)
        libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007fdbf625a000)
        libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007fdbf6226000)
        libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007fdbf60e3000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fdbf5f9f000)
        libXi.so.6 => /usr/lib/x86_64-linux-gnu/libXi.so.6 (0x00007fdbf5f8b000)
        libXxf86vm.so.1 => /usr/lib/x86_64-linux-gnu/libXxf86vm.so.1 (0x00007fdbf5c00000)
        libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fdbf5f60000)
        libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007fdbf5f4b000)
        libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007fdbf5f46000)
        libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fdbf5800000)
        libbsd.so.0 => /usr/lib/x86_64-linux-gnu/libbsd.so.0 (0x00007fdbf5f2d000)
        libmd.so.0 => /usr/lib/x86_64-linux-gnu/libmd.so.0 (0x00007fdbf5f20000)
t$ 
t$ ./Mandelbrot 
[CUDA Mandelbrot/Julia Set] - Starting...
GPU Device 0: "Pascal" with compute capability 6.0

Data initialization done.
Initializing GLUT...
OpenGL window created.
Creating GL texture...
Texture created.
Creating PBO...
CUDA error at Mandelbrot.cpp:916 code=999(cudaErrorUnknown) "cudaGraphicsGLRegisterBuffer( &cuda_pbo_resource, gl_PBO, cudaGraphicsMapFlagsWriteDiscard)" 
t$ 
t$ 

Seems overly convoluted pile of code just for a trivial Mandelbrot :  

000870
000871  void initOpenGLBuffers(int w, int h) {
000872    // delete old buffers
000873    if (h_Src) {
000874      free(h_Src);
000875      h_Src = 0;
000876    }
000877
000878    if (gl_Tex) {
000879      glDeleteTextures(1, &gl_Tex);
000880      gl_Tex = 0;
000881    }
000882
000883    if (gl_PBO) {
000884      // DEPRECATED: checkCudaErrors(cudaGLUnregisterBufferObject(gl_PBO));
000885      cudaGraphicsUnregisterResource(cuda_pbo_resource);
000886      glDeleteBuffers(1, &gl_PBO);
000887      gl_PBO = 0;
000888    }
000889
000890    // allocate new buffers
000891    h_Src = (uchar4 *)malloc(w * h * 4);
000892
000893    printf("Creating GL texture...\n");
000894    glEnable(GL_TEXTURE_2D);
000895    glGenTextures(1, &gl_Tex);
000896    glBindTexture(GL_TEXTURE_2D, gl_Tex);
000897    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
000898    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
000899    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
000900    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
000901    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE,
000902                 h_Src);
000903    printf("Texture created.\n");
000904
000905    printf("Creating PBO...\n");
000906    glGenBuffers(1, &gl_PBO);
000907    glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, gl_PBO);
000908    glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, w * h * 4, h_Src, GL_STREAM_COPY);
000909    // While a PBO is registered to CUDA, it can't be used
000910    // as the destination for OpenGL drawing calls.
000911    // But in our particular case OpenGL is only used
000912    // to display the content of the PBO, specified by CUDA kernels,
000913    // so we need to register/unregister it only once.
000914
000915    // DEPRECATED: checkCudaErrors( cudaGLRegisterBufferObject(gl_PBO) );
000916    checkCudaErrors(cudaGraphicsGLRegisterBuffer(
000917        &cuda_pbo_resource, gl_PBO, cudaGraphicsMapFlagsWriteDiscard));
000918    printf("PBO created.\n");
000919
000920    // load shader program
000921    gl_Shader = compileASMShader(GL_FRAGMENT_PROGRAM_ARB, shader_code);
000922  }
000923

[shakes76]

Can confirm I get this error for Ubuntu 22.04 and CUDA 12.3. To even get this far I had to hard code default paths for libGL from where the drivers are installed into findlibgl.mk file to build it. Perhaps the correct GL libs are not being used?

[shakes76]

Found my issue. You need to use NVIDIA Graphics mode on your laptop, other modes, even Hybrid will not work.