[gdal-dev] strange behaviour of the python bindings in a seldom case

[Matthieu Rigal]

Dear GDAL heroes,

I have encountered a very strange behaviour of the python bindings. I am using 
version 1.7.3 with Python 2.6 on a OpenSuse 11 64bits.

We developped an in-house C++ python accessor and I get a segmentation fault 
at a very bizarre place.

I am launching following minimal python script :
#!/usr/local/bin/python
import sys
from osgeo import gdal, ogr
print sys.argv 

if I launch it from this minimal shell script, everything goes fine :
python sample1.py 1
python sample1.py 2

But if I launch it through our C++ accessor, I got systematically a 
"segmentation fault" WHEN CALLING THE SCRIPT A SECOND TIME, that is located at 
the import step.

Stranger, if I replace the double load "gdal, ogr", by gdal or ogr, the 
scripts are working as many as I want !!! (gdal+osr crashes also, whereas 
ogr+osr does not !)

It crashes only at the second run when loading gdal AND ogr... and trying to 
repeat the error via a shellscript or via inline commands does not point the 
same problems...

I tried to use the sys.modules.items() to see if still some modules were 
present, I tried to use the reload() for the modules and I could not solve the 
problem...

The fact that it is crashing only from our launcher could indicate that here 
comes the error from, but I could not find anything... maybe I could run a 
"clean loaded module" command on the C++/Python interface, which I did not 
found now...
(The C++/interface is a part of a much bigger processing pacakage, therefore I 
can not give easily a sample)

But also, the fact that this only occurs with >1 osgeo packages (I tried 
several other ones) indicates that there might be a problem on this side, or 
am I wrong ?

Any help or hint on something I could have forgotten would be appreciated !

Best Regards,
Matthieu Rigal

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