Internal Server Error

[Daniele Margotti]

Hi list,
I use CGI MapServer 4.2.3 on a RH9 with Apache 2.0.50:

<!-- MapServer version 4.2.3 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG
OUTPUT=WBMP OUTPUT=PDF SUPPORTS=FREETYPE INPUT=EPPL7 INPUT=OGR
INPUT=GDAL INPUT=SHAPEFILE -->

All works, but I have a map that returns an "Internal Server Error" when
I try to zoom and show a certain extent with a specific layer.
I think the problem is due to the shapefile (or a part of it), but...
how can I be sure of it?


The browser only show the "Internal Server Error" page.
The Apache error log says: "[Mon Dec 06 07:13:04 2004] [error] [client
172.16.20.4] Premature end of script headers: mapserv"


I compiled MapServer with --enable-debug, set "DEBUG TRUE" in the map
section of the mapfile, and tried to use shp2img with these results:
------------------------------------------------------------------------
----
[root at redhat cs]# /dati/geobase/bin/shp2img -m cs.map -o
/dati/daniele.png -e 2491361 4510665 2492415 4511455
[Mon Dec  6 07:24:37 2004].748031 msDrawMap(): Layer 0
(Confini_comunali), 0.040s
[Mon Dec  6 07:24:41 2004].893212 msDrawMap(): Layer 1
(Base_cartografica), 4.145s
[Mon Dec  6 07:24:41 2004].908452 msDrawMap(): Layer 2 (Edifici), 0.015s
[Mon Dec  6 07:24:41 2004].918383 msDrawMap(): Layer 3 (Aree_traffico),
0.010s
Segmentation fault
------------------------------------------------------------------------
----
[root at redhat cs]# /dati/geobase/bin/shp2img -m cs.map -o
/dati/daniele.png -e 2491361 4510665 2492415 4511455 -l
Elementi_stradali
Segmentation fault

------------------------------------------------------------------------
----

When shp2img processes the "bad" layer ('Elementi_stradali'), it exits
with a 'Segmentation fault' and without a more explicit error message.

I launched the following command (where "road_elements.shp" is the
probably bad shapefile):
[root at redhat cat_strade]# ogrinfo -al road_elements.shp -spat 2491361
4510665 2492415 451145

It returns a 85 Kb output with apparently no detected errors.


How can I understand where the error lies?
Is there a more powerful debug tool?

Thank you,
    Daniele

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