[mapserver-users] Expression segmentation fault

[Frank Broniewski]

Hi,

I just updated my mapserver installation to the latest version (6.2.1). 
I'm running FreeBSD 9.1 and I'm getting a segmentation fault related to 
expression usage in my mapfile. I've already compiled mapserver with 
debug symbols and I loaded the core file into gdb:

 > gdb /usr/local/www/apache22/cgi-bin/mapserv mapserv.core
<snip>
Reading symbols from /lib/libc.so.7...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /usr/local/lib/libintl.so.9...done.
Loaded symbols for /usr/local/lib/libintl.so.9
Reading symbols from /usr/lib/libsupc++.so.1...done.
Loaded symbols for /usr/lib/libsupc++.so.1
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0  0x00000008008e2520 in yylex (lvalp=0x7fffffffd250, p=0x7fffffffd3b0) 
at mapparser.y:649
649	mapparser.y: No such file or directory.
	in mapparser.y
[New Thread 809007400 (LWP 101134/mapserv)]

So apparently there seems to be a file missing!? Looking at the source 
code (git), line 649 is a blank line, so I'm not sure what's missing 
exactly. I've got yacc, bison and flex installed. For testing purposes 
I'm using the mapserver cgi on the command line:

/usr/local/www/apache22/cgi-bin/mapserv -nh 
"QUERY_STRING=map=/data/web/mapserver/cnra/cnra.map&mode=map&layer=boundaries"

The boundaries layer:

Layer

#    Classitem "level"
     Connection "host=10.0.0.2 dbname=osm user=user password=guessme"
     Connectiontype Postgis
     Data "geom FROM (SELECT osm_id, way AS geom, name, admin_level AS 
level, tags FROM planet_osm_polygon) AS foo USING UNIQUE osm_id USING 
SRID=3857"
     Filter "tags ?& ARRAY['boundary', 'admin_level']"
     Name "boundaries"
     Processing "CLOSE_CONNECTION=DEFER"
     Status on
     Type line
     Units meters

     Metadata
         "ows_title" "Boundary Map"
         "ows_abstract" "Boundary map - data from OpenStreetMap, ODbl 
licensed"
     End

     Projection
         "init=epsg:3857"
     End

     Class

         Expression ("[level]" = "6")
#        Expression "6"
         Name "communes"

         Style
             Color 10 10 10
             Opacity 50
             Width 2
         End

     End
End


The classitem / simple expression (Expression "6") works with the 
mapserver cgi, but python mapscript throws an error: 
_mapscript.MapServerError: msEvalExpression(): General error message. 
Invalid item index.

I've read the mapserver expressions documentation [1] and the note that 
says something about the working environment might be linked to more 
than one expression library. But my operating system skills are not high 
enough to turn this paragraph into something useful for me.

So any help is greatly appreciated.

Frank


Frank BRONIEWSKI

METRICO s.à r.l.
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