[vtkusers] vtkGraph::AddVertex segfault

[Aashish Chaudhary]

normally a push on vector should not result in crash. Something else is
wrong somewhere.

Also are you getting std::bad_alloc exception?

On Thu, May 13, 2010 at 3:41 PM, Caleb Johnston <cjj37 at cornell.edu> wrote:

> If I comment out the code, it does not crash. But I also have to end the
> whole control flow at that point because everything after it depends upon
> that data. But there is no crash.
>
> Caleb
>
>
> On Thu, May 13, 2010 at 3:25 PM, Aashish Chaudhary <
> aashish.chaudhary at kitware.com> wrote:
>
>> 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
>>
>
>


-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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