[ITK] gpu mean filter segfault

[Dženan Zukić]

Hi Wei,

you should start by setting a breakpoint in
file /home/weiliu/packages/ITK/Modules/Filtering/GPUSmoothing/include/itkGPUMeanImageFilter.hxx,
line 75 and inspect variables involved in that statement: does oPtr point
to a valid itk::Image etc. If you find a problem with the code or
documentation, please submit <http://itk.org/Wiki/ITK/Git/Develop> a fix.

Regards,
Dženan

On Tue, Sep 13, 2016 at 2:54 PM, Wei Liu <weiliu620 at gmail.com> wrote:

> Hi community,
>
> It's more like a question to developers. I'm using itkGPUMeanImageFilter
> and got a segfault. Here are the steps I took:
>
> - Compile latest github version of ITK with GPU option on
> - Wrote a program to apply gpu mean filter on a 3D MRI brain image.
>
> Run it in gdb (to show the location of segfault) and here is the output:
> ---------- gdb output ------------------------
> (gdb) run -i ../data/MRHead.nrrd -o tmp.nrrd
> Starting program: /home/weiliu/build/gpu_mean_smoothing -i
> ../data/MRHead.nrrd -o tmp.nrrd
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> Platform  : NVIDIA CUDA
> [New Thread 0x7ffff465e700 (LWP 12782)]
> [New Thread 0x7fffebbff700 (LWP 12783)]
> [New Thread 0x7fffeb2b6700 (LWP 12784)]
> [New Thread 0x7fffeaab5700 (LWP 12785)]
> [New Thread 0x7fffea2b4700 (LWP 12786)]
> [New Thread 0x7fffe9ab3700 (LWP 12787)]
> [New Thread 0x7fffe92b2700 (LWP 12788)]
> GeForce GTX 980 Ti
> Maximum Work Item Sizes : { 1024, 1024, 64 }
> Maximum Work Group Size : 1024
> Alignment in bits of the base address : 4096
> Smallest alignment in bytes for any data type : 128
> 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_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
> Defines: #define DIM_3
> #define PIXELTYPE float
>
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0000000000670f96 in itk::GPUMeanImageFilter<itk::Image<float, 3u>,
> itk::Image<float, 3u> >::GPUGenerateData (this=0x1b01f00)
>     at /home/weiliu/packages/ITK/Modules/Filtering/GPUSmoothing/include/
> itkGPUMeanImageFilter.hxx:75
> 75  typename GPUOutputImage::SizeType outSize = otPtr->
> GetLargestPossibleRegion().GetSize();
> --------- end of gdb output --------------------
>
> So where should I start to debug? I'm on Ubuntu 14.04 LTS, 64 bit, with
> CUDA 7.5.
>
> Thanks for your input.
>
> _______________________________________________
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>
>
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