[mapserver-users] Expression segmentation fault
Rahkonen Jukka
jukka.rahkonen at mmmtike.fi
Thu Sep 5 07:11:24 PDT 2013
Hi,
Osm2pgsql can create invalid polygons with self-intersections and/or three-vertex A-B-A rings. It might be good to run MakeValid or simply find possibly invalid features with IsValid and delete them and then see if Mapserver gets happy. Actually, run IsValid and save the faulty geometries somewhere before correcting or deleting them. It would be nice to catch them if they happen to be the reason for the crash.
-Jukka Rahkonen-
Frank Broniewski wrote:
>
> Ok, this is weird. It is, as I know now, data source related. I was poking in the
> layer configuration to find out why the core dump happens.
> Reinstalling didn't solve the issue, btw.
>
> So first I converted the data to shapefile with ogr2ogr (as always very
> handy!) and changed the layer accordingly. And no core dump happened!
> Then I tried several versions of the data and filter statements without success.
> Since this is a osm2pgsql database I swapped finally the table from
> planet_osm_polygon to planet_osm_line (same table schema apart from the
> geometry) - and voilà - no core dump.
>
> So I can relate the problem to the planet_osm_polygon table - but I'm not sure
> what difference actually is responsible for the crash ...
>
> The most apparent difference is of course the geometry type:
> planet_osm_line is linestring, planet_osm_polygon is geometry ...
>
> I will investigate the attributes further tomorrow, but now I need to earn some
> money. It's always the deadlines ...
>
>
> Frank
>
>
> Am 2013-09-05 09:47, schrieb thomas bonfort:
> > Frank,
> > This is such a simple use-case that I doubt it's a bug in the code
> > per-se. Can you make sure that you are using a clean build (make clean
> > && make && make install) as I suspect this could be happening due to a
> > compilation problem (as a rule of thumb, with mapserver <6.4, always
> > run make clean after re-running configure)
> >
> > --
> > thomas
> >
> >
> > On Wed, Sep 4, 2013 at 2:39 PM, Frank Broniewski <brfr at metrico.lu> wrote:
> >> Am 2013-09-04 14:33, schrieb thomas bonfort:
> >>
> >>> Frank, please supply a backtrace of the crash (`bt` in gdb once it has
> >>> halted at the segfault)
> >>>
> >>> --
> >>> thomas
> >>>
> >>> On Wed, Sep 4, 2013 at 2:25 PM, Frank Broniewski <brfr at metrico.lu>
> wrote:
> >>>>
> >>>> 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&laye
> r=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.
> >>>> géomètres
> >>>> technologies d'information géographique
> >>>> rue des Romains 36
> >>>> L-5433 NIEDERDONVEN
> >>>>
> >>>> tél.: +352 26 74 94 - 28
> >>>> fax.: +352 26 74 94 99
> >>>> http://www.metrico.lu
> >>>> _______________________________________________
> >>>> mapserver-users mailing list
> >>>> mapserver-users at lists.osgeo.org
> >>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> >>>
> >>>
> >>>
> >>
> >> Hi Thomas,
> >>
> >> thanks for the fast response! Here's the bt:
> >>
> >> (gdb) bt
> >>
> >> #0 0x00000008008e2520 in yylex (lvalp=0x7fffffffd250, p=0x7fffffffd3b0) at
> >> mapparser.y:649
> >> #1 0x00000008008e0146 in yyparse (p=0x7fffffffd3b0) at mapparser.c:1500
> >> #2 0x00000008009239b2 in msEvalExpression (layer=0x809009000,
> >> shape=0x7fffffffd4e0,
> >> expression=0x8090a0280, itemindex=-1) at maputil.c:478
> >> #3 0x0000000800923f03 in msShapeGetClass (layer=0x809009000,
> >> map=0x8090bd800,
> >> shape=0x7fffffffd4e0, classgroup=0x0, numclasses=1) at maputil.c:581
> >> #4 0x0000000800980ab2 in msDrawVectorLayer (map=0x8090bd800,
> >> layer=0x809009000, image=0x8090a91c0)
> >> at mapdraw.c:989
> >> #5 0x00000008009800ed in msDrawLayer (map=0x8090bd800,
> layer=0x809009000,
> >> image=0x8090a91c0)
> >> at mapdraw.c:808
> >> #6 0x000000080097ed18 in msDrawMap (map=0x8090bd800, querymap=0)
> at
> >> mapdraw.c:437
> >> #7 0x0000000800a16e6e in msCGIDispatchImageRequest
> (mapserv=0x8090b2300) at
> >> mapservutil.c:1448
> >> #8 0x0000000800a179c2 in msCGIDispatchRequest (mapserv=0x8090b2300)
> at
> >> mapservutil.c:1690
> >> #9 0x00000000004012c1 in main (argc=3, argv=0x7fffffffd9f0) at
> >> mapserv.c:259
> >> (gdb)
> >>
> >>
> >>
> >>
> >> --
> >> Frank BRONIEWSKI
> >>
> >> METRICO s.à r.l.
> >> géomètres
> >> technologies d'information géographique
> >> rue des Romains 36
> >> L-5433 NIEDERDONVEN
> >>
> >> tél.: +352 26 74 94 - 28
> >> fax.: +352 26 74 94 99
> >> http://www.metrico.lu
> >
> >
>
>
> --
> Frank BRONIEWSKI
>
> METRICO s.à r.l.
> géomètres
> technologies d'information géographique
> rue des Romains 36
> L-5433 NIEDERDONVEN
>
> tél.: +352 26 74 94 - 28
> fax.: +352 26 74 94 99
> http://www.metrico.lu
> _______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
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