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Here is how I solved the issue: Essentially, if I replace src = src_bgr; with src_bgr.copyTo(src); or gpu_src.upload(src_bgr); it's working.

    enum    AllocType {  PAGE_LOCKED = 1,   SHARED = 2,  WRITE_COMBINED = 4 };
    cv::cuda::HostMem cudamem_src(src_bgr.size(), CV_8UC3, cv::cuda::HostMem::AllocType::SHARED );
    cv::cuda::HostMem cudamem_dst(src_bgr.size(), CV_8UC3, cv::cuda::HostMem::AllocType::SHARED);

    cv::cuda::GpuMat gpu_src = cudamem_src.createGpuMatHeader();
    cv::cuda::GpuMat gpu_dst = cudamem_dst.createGpuMatHeader();
    cv::Mat src = cudamem_src.createMatHeader();
    cv::Mat dst = cudamem_dst.createMatHeader();

//    src_bgr.copyTo(src);
    gpu_src.upload(src_bgr);

    cv::cuda::remap(gpu_src, gpu_dst, gpu_map1, gpu_map2, cv::INTER_LINEAR);
    cv::imwrite("imgout.jpg", dst);

Here is how I solved the issue: Essentially, if I replace src = src_bgr; with src_bgr.copyTo(src); or gpu_src.upload(src_bgr); it's working.

    enum    AllocType {  PAGE_LOCKED = 1,   SHARED = 2,  WRITE_COMBINED = 4 };
    cv::cuda::HostMem cudamem_src(src_bgr.size(), CV_8UC3, cv::cuda::HostMem::AllocType::SHARED );
    cv::cuda::HostMem cudamem_dst(src_bgr.size(), CV_8UC3, cv::cuda::HostMem::AllocType::SHARED);

    cv::cuda::GpuMat gpu_src = cudamem_src.createGpuMatHeader();
    cv::cuda::GpuMat gpu_dst = cudamem_dst.createGpuMatHeader();
    cv::Mat src = cudamem_src.createMatHeader();
    cv::Mat dst = cudamem_dst.createMatHeader();

//    src_bgr.copyTo(src);
    gpu_src.upload(src_bgr);

    cv::cuda::remap(gpu_src, gpu_dst, gpu_map1, gpu_map2, cv::INTER_LINEAR);
    cv::imwrite("imgout.jpg", dst);

Here is how I solved the issue: Essentially, if I replace src = src_bgr; with src_bgr.copyTo(src); or gpu_src.upload(src_bgr); it's working.

    enum    AllocType {  PAGE_LOCKED = 1,   SHARED = 2,  WRITE_COMBINED = 4 };
    cv::cuda::HostMem cudamem_src(src_bgr.size(), CV_8UC3, cv::cuda::HostMem::AllocType::SHARED );
    cv::cuda::HostMem cudamem_dst(src_bgr.size(), CV_8UC3, cv::cuda::HostMem::AllocType::SHARED);

    cv::cuda::GpuMat gpu_src = cudamem_src.createGpuMatHeader();
    cv::cuda::GpuMat gpu_dst = cudamem_dst.createGpuMatHeader();
    cv::Mat src = cudamem_src.createMatHeader();
    cv::Mat dst = cudamem_dst.createMatHeader();

//    src_bgr.copyTo(src);
    gpu_src.upload(src_bgr);

    cv::cuda::remap(gpu_src, gpu_dst, gpu_map1, gpu_map2, cv::INTER_LINEAR);
    cv::imwrite("imgout.jpg", dst);

I wonder what's the difference between src = src_bgr; with and src_bgr.copyTo(src);