Dear maintainers,

I found a reproduce step. Could you try this?

$ sudo modprobe -r nvidia_uvm
$ clinfo

$ nvidia-modprobe -u
$ clinfo

$ sudo modprobe nvidia_uvm
$ clinfo


I’m using newer driver 390.25-1 from SVN.
Although nvidia-modprobe is setuided, it seems
not to work properly as expected. 

Regards,
Hiromasa YOSHIMOTO

> 2018/02/05 16:02、Pascal Obry <pas...@obry.net>のメール:
> 
> Hello Andreas,
> 
> Thanks for your feedback. I have just rebooted and tested as you
> proposed:
> 
> First, unload is not possible as nvidia is in use.
> 
> $ sudo modprobe -r nvidia
> [sudo] password for obry: 
> modprobe: FATAL: Module nvidia_drm is in use.
> modprobe: FATAL: Error running remove command for nvidia
> 
> $ lsmod | grep nvidia
> nvidia_drm             53248  4
> drm_kms_helper        192512  1 nvidia_drm
> drm                   438272  7 nvidia_drm,drm_kms_helper
> nvidia_modeset        860160  9 nvidia_drm
> nvidia              13168640  594 nvidia_modeset
> 
> $ nvidia-modprobe -u
> 
> Let's check clinfo:
> 
> $ clinfo
> Number of platforms                               0
> 
> Not working, so let's run clinfo as root:
> 
> $ sudo clinfo
> Number of platforms                               1
>  Platform Name                                   NVIDIA CUDA
>  Platform Vendor                                 NVIDIA Corporation
>  Platform Version                                OpenCL 1.2 CUDA 9.0.282
>  Platform Profile                                FULL_PROFILE
>  Platform Extensions                             
> cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics 
> cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics 
> cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing 
> cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll 
> cl_nv_copy_opts cl_khr_gl_event cl_nv_create_buffer
>  Platform Extensions function suffix             NV
> 
>  Platform Name                                   NVIDIA CUDA
> Number of devices                                 1
>  Device Name                                     Quadro M1000M
>  Device Vendor                                   NVIDIA Corporation
> ...
> 
> All fine now. And running clinfo as user also works fine at this stage and 
> this until I reboot.
> 
> And the permissions bits are ok:
> 
> $ ls -la /usr/bin/nvidia-modprobe
> -rwsr-xr-x 1 root root 34904 Jan 13 16:43 /usr/bin/nvidia-modprobe
> 
> Please let me know if you want me to do some more testing.
> 
> This seems fishy and I can assure you that I have the same issue on two 
> different computers.
> 
> Regards,
> 
> -- 
>  Pascal Obry /  Magny Les Hameaux (78)
> 
>  The best way to travel is by means of imagination
> 
>  http://www.obry.net
> 
>  gpg --keyserver keys.gnupg.net --recv-key F949BD3B
> 
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