[vtk-developers] Fwd: Re: [vtkusers] segfault when vtkXMLMultiBlockDataReader reads a .vtm binary mode - bug?

[Tanaka Simon]

Dear Developers and Users,

I'll warming up this issue again since there was no echo last time.

Can somebody confirm the buggy behaviour of the following code:

#include <vtkSmartPointer.h>
#include <vtkPolyData.h>
#include <vtkPointData.h>
#include <vtkMultiBlockDataSet.h>
#include <vtkXMLMultiBlockDataWriter.h>
#include <vtkXMLMultiBlockDataReader.h>
#include <vtkStringArray.h>
#include <sys/stat.h>
#include <sstream>

int main(int, char *[])
{
     /**
      * notes:
      * -> it works with ascii writer configuration for any M,N.
      * -> with binary writer configuration it segfaults for higher M,N
      * -> {N=100,M=1} works. {N=100,M=10} fails. {N=1000,M=1} fails.
      */
     const unsigned int N = 1000; // number of points
     const unsigned int M = 1; // number of characters in the string

     std::string filename = "test_output.vtm";
     std::stringstream mystring;
     struct stat buffer;

     vtkSmartPointer<vtkPoints> points =
             vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkStringArray> stringAttribute =
             vtkSmartPointer<vtkStringArray>::New();
     vtkSmartPointer<vtkPolyData> mypolydata =
             vtkSmartPointer<vtkPolyData>::New();
     vtkSmartPointer<vtkMultiBlockDataSet> multiBDS =
             vtkSmartPointer<vtkMultiBlockDataSet>::New ();
     vtkSmartPointer<vtkXMLMultiBlockDataWriter> writer =
vtkSmartPointer<vtkXMLMultiBlockDataWriter>::New();
     vtkSmartPointer<vtkMultiBlockDataSet> multiBDS_read =
             vtkSmartPointer<vtkMultiBlockDataSet>::New ();
     vtkSmartPointer<vtkXMLMultiBlockDataReader> reader =
vtkSmartPointer<vtkXMLMultiBlockDataReader>::New();

     stringAttribute->SetNumberOfComponents(1);
     reader->SetFileName(filename.c_str());
     writer->SetFileName(filename.c_str());
     writer->SetDataModeToBinary(); // segfault
     //writer->SetDataModeToAscii(); // works

     // create some points:
     for (int k=0; k<N; ++k) {
         points->InsertNextPoint(0.0, 0.0, 0.0);
     }

     // create some string attributes:
     for (int k=0; k<N; ++k) {
         for (int i=0; i<M; ++i) {
             mystring << "x";
         }
         stringAttribute->InsertNextValue(mystring.str().c_str());
     }

     // assemble and write to file:
     mypolydata->SetPoints(points);
     mypolydata->GetPointData()->AddArray(stringAttribute);
     multiBDS->SetBlock(0,mypolydata);
     writer->SetInput(multiBDS);
     writer->Write();

     //now read the file again:
     if (stat (filename.c_str(), &buffer) == 0) {
         reader->Update();
         multiBDS_read->ShallowCopy(reader->GetOutput());
     }
     else {
         std::cout<<"file not found."<<std::endl;
     }

     return EXIT_SUCCESS;
}



thank you.
Simon


-------- Forwarded Message --------
Subject: 	Re: [vtkusers] segfault when vtkXMLMultiBlockDataReader reads 
a .vtm binary mode - bug?
Date: 	Tue, 04 Nov 2014 22:34:01 +0100
From: 	Tanaka Simon <tanakas at gmx.ch>
To: 	VTK Users <vtkusers at vtk.org>, vtk-developers at vtk.org



Dear Developers,

can somebody confirm the buggy behaviour?

i attached a yet simplified code to reproduce the segfault.

thanks
simon


btw: i use ubuntu 14.04 and gcc 4.7




On 03.11.2014 11:19, Tanaka Simon wrote:
> Dear Developers,
>
> Hello VTK users and developers,
>
> I attached a simple program which segfaults. please also have a look
> at the comments in the code.
>
> i want to:
> 1) write a vtkMultiBlockDataSet to a file
> 2) load it
>
> it only segfaults if the writer is set to binary mode, and only if the
> data exceeds a certain size. in ascii mode, everything is fine.
>
>
> this might be related:
> http://www.paraview.org/Bug/print_bug_page.php?bug_id=13294
>
>
> can you confirm that behaviour? what am i doing wrong? and if it is a
> bug, how can i work around?
>
> thank you very much
> simon




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cmake_minimum_required(VERSION 2.8)

PROJECT(vtk_weird_segfault)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(vtk_weird_segfault MACOSX_BUNDLE vtk_weird_segfault)

if(VTK_LIBRARIES)
  target_link_libraries(vtk_weird_segfault ${VTK_LIBRARIES})
else()
  target_link_libraries(vtk_weird_segfault vtkHybrid vtkWidgets)
endif()
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