[vtkusers] vtkGraph::AddVertex segfault

[Aashish Chaudhary]

Can you try this..

Can you comment the code where you are loading volume data? And see if you
can replicate the crash?


On Thu, May 13, 2010 at 3:17 PM, Caleb Johnston <cjj37 at cornell.edu> wrote:

> The code is not that compilable without Qt, VTK, ITK, and Cmake installed.
> It is publicly hosted at SourceForge:
> http://sourceforge.net/projects/glassbrain/
>
> And the stack trace shows the problem arrises from the AddVertex call.
>
>
> On Thu, May 13, 2010 at 2:25 PM, David Doria <daviddoria+vtk at gmail.com<daviddoria%2Bvtk at gmail.com>
> > wrote:
>
>> On Thu, May 13, 2010 at 2:16 PM, Caleb Johnston <cjj37 at cornell.edu>
>> wrote:
>> > I'm getting a segfault when calling
>> vtkMutableUndirectedGraph::AddVertex.
>> > However, it does not always occur at the same vertex. Sometimes it is
>> after
>> > the 2nd vertex. Sometimes it won't happen at all (though rarely). I'm
>> only
>> > adding about 120 vertices. And the program is not consuming large
>> amounts of
>> > data so I don't understand why this is happening. Also, this only
>> happens in
>> > Linux and Windows but not MacOS X. Below, I have included my algorithm
>> for
>> > adding vertices.
>> > thanks,
>> > Caleb
>> > ...
>> > int len = 0;
>> > double X,Y,Z,Count;
>> > for(i=0, j=0; j<numberOfLabels; i+=3, j++){
>> >    X = (double)coords[i];
>> >    Y = (double)coords[i+1];
>> >    Z = (double)coords[i+2];
>> >    Count = (double)centroids[j];
>> >    if(Count>0.0){
>> >       X = X / Count;
>> >       Y = Y / Count;
>> >       Z = Z / Count;
>> >       len++;
>> >       graph->AddVertex();  // crashes here.
>> >       graph->Update();
>> >       points->InsertNextPoint(X, Y, Z);
>> >    }
>> > }
>> > ...
>>
>> I've used this in Linux plenty of times with no problems. If you post
>> some compilable code I can see if it works on my machine. My initial
>> bet is that something is going wrong around there, like accessing out
>> of bounds elements in coords or centroids.
>>
>> Thanks,
>>
>> David
>>
>
>
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-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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