[Rtk-users] SegFault - FirstReconstruction

[Cyril Mory]

Hi Padraig,

It is puzzling, as the code is simple and we have many machines on which 
it works without problem. So let's explore the weirder options :
- In one of your previous emails, you mentioned that "the same example 
runs without a seg fault in the build directory". What does that mean ?
- Can you go into your build directory, run "make test", and post the 
result of the tests ?
- Have you tried installing RTK on another machine ?

Regards,
Cyril

On 09/16/2014 04:38 PM, Padraig Looney wrote:
> It happens with the first call.
>
> I set a breakpoint just before and it is not empty. I have tried to 
> attach a screen capture of my space.
>
> Yes I thought I may have changed something but I have copied the 
> directory twice from the original download in which it builds 
> correctly. I cloned this with git and there are no changes.
>
>
> On Tue, Sep 16, 2014 at 3:23 PM, Cyril Mory 
> <cyril.mory at creatis.insa-lyon.fr 
> <mailto:cyril.mory at creatis.insa-lyon.fr>> wrote:
>
>     Hi Padraig,
>
>     Does the segfault happen at the first call of
>     geometry->AddProjection(...) or later ?
>
>     My guess is that, for some reason, geometry is not initialized.
>     Can you make sure it is by setting a breakpoint just before ?
>     You should also make sure that all variables involved in this
>     call, ie "sid", "sdd", "angle", "isox" and "isoy" have reasonable
>     values before the call.
>
>     It is probably not a good question, yet I have to ask : did you
>     modify something in the file
>     examples/FirstReconstruction/FirstReconstruction.cxx ?
>
>     Regards,
>     Cyril
>
>
>     On 09/16/2014 04:07 PM, Padraig Looney wrote:
>>     Thanks Cyril,
>>
>>     Following your advice I have tracked the seg fault down to line
>>     36 in FirstReconstruction
>>
>>     geometry->AddProjection(sid,
>>                                 sdd,
>>                                 angle,
>>                                 isox,
>>                                 isoy);
>>         }
>>
>>     I realised that I managed to build the examples with RTK fine and
>>     the same example runs without a seg fault in the build directory.
>>
>>     On Tue, Sep 9, 2014 at 11:32 AM, Cyril Mory
>>     <cyril.mory at creatis.insa-lyon.fr
>>     <mailto:cyril.mory at creatis.insa-lyon.fr>> wrote:
>>
>>         Hi Padraig,
>>
>>         With so little information, there isn't much we can do to
>>         help you.
>>         I usually track segfaults by compiling in Debug mode (by
>>         setting "CMAKE_BUILD_TYPE" to "Debug"), then running the
>>         program in debug in QT Creator (any decent IDE will do just
>>         fine, and should stop when the segfault occurs, allowing you
>>         to trace it back)
>>
>>         Good luck,
>>         Cyril
>>
>>
>>         On 09/09/2014 12:05 PM, Padraig Looney wrote:
>>>         When I try to run the "FirstReconstruction" example I am
>>>         getting a segmentation fault.
>>>
>>>         The following is the output from gdb
>>>
>>>         Program received signal SIGSEGV, Segmentation fault.
>>>         0x00000000004952d7 in typeinfo for
>>>         rtk::ProjectionGeometry<3u> ()
>>>
>>>
>>>
>>>
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>>
>>         -- 
>>         --
>>         Cyril Mory, Post-doc
>>         CREATIS
>>         Leon Berard cancer treatment center
>>         28 rue Laënnec
>>         69373 Lyon cedex 08 FRANCE
>>
>>         Mobile:+33 6 69 46 73 79  <tel:%2B33%206%2069%2046%2073%2079>
>>
>>
>
>     -- 
>     --
>     Cyril Mory, Post-doc
>     CREATIS
>     Leon Berard cancer treatment center
>     28 rue Laënnec
>     69373 Lyon cedex 08 FRANCE
>
>     Mobile:+33 6 69 46 73 79  <tel:%2B33%206%2069%2046%2073%2079>
>
>

-- 
--
Cyril Mory, Post-doc
CREATIS
Leon Berard cancer treatment center
28 rue Laënnec
69373 Lyon cedex 08 FRANCE

Mobile: +33 6 69 46 73 79

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