[Rivet] Segmentation fault when running agile-runmc on the grid

[Sara Alderweireldt]

Hello,

I've been running agile+rivet locally for a while now, and this week 
attempted moving my runs to the grid. I still access my own copy of 
agile+rivet (which locally runs fine) and use a python script which 
calls 'agile-runmc ... &' and 'rivet ...'. If I use the PYTUNE or 
MSTP(52) flag to set an external PDF from lhapdf, I get a segmentation 
fault when running on the grid, and no problem when running locally. If 
I use internal PDFs included in pythia6, everything runs fine both on 
the grid and locally.

At some point, I also had this segmentation fault locally, and traced it 
back with gdb (and a lot of manual print statements) to:
/line 471           throw runtime_error((string("Failed to load 
libraries: ") + dlerror()).c_str());/
in AGILe-1.3.0/src/Core/Loader.cc. Recompiling both LHAPDF and pythia6 
solved this.

If I comment out the runtime_error and run on the grid, I get a python 
symbol lookup error:
python: symbol lookup error: mydirs/libpythia6.so: undefined symbol: pdfset_

Do you have any idea what might cause this or what I could try to trace 
it back further? I'm entirely puzzled by the fact that everything is 
fine when processing locally and not when submitting to the grid, both 
methods are accessing the same hard drive with the agile & rivet 
distributions on it. I tried tracking from the agile-runmc script and 
got to FPythia.cc which calls PYEVT (at which point the symbol lookup 
error arrives, no events are produced), but I can't figure out where it 
goes wrong exactly or how to solve it.

I checked when running on the grid what the output of 'lhapdf-config 
--pdfsets-path' is, and it is returning the correct folder and the 
needed LHpdf file is there. If versions are relevant, I'm using agile 
1.3.0, rivet 1.6.0, pythia 6.425, lhapdf 5.8.6, python 2.4.3 and gcc 
4.1.2. I hope you can shed some light on this.

Best regards and thanks in advance,
Sara

-- 

Sara Alderweireldt sara.alderweireldt at ua.ac.be 
<mailto:sara.alderweireldt at ua.ac.be>
Universiteit Antwerpen    Phone: +32 (0)3 265 3577
CGB.U.237 - Physics
Groenenborgerlaan 171
2020 Antwerpen http://www.ua.ac.be/edf
Belgium

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