[mapserver-users] Need help tracking down mapserv seg fault

[Johan Forsman]

I stopped the AppArmor service and reran the test with no change in behavior.

Thanks,
Johan.

> -----Original Message-----
> From: Umberto Nicoletti [mailto:umberto.nicoletti at gmail.com]
> Sent: Tuesday, August 17, 2010 2:20 AM
> To: Johan Forsman
> Cc: mapserver-users at lists.osgeo.org
> Subject: Re: [mapserver-users] Need help tracking down mapserv seg fault
> 
> It could be a problem with selinux/apparmor, try to disable it.
> Best regards,
> Umberto
> 
> On Fri, Aug 13, 2010 at 3:49 PM, Johan Forsman <Johan.Forsman at la.gov>
> wrote:
> > Hello All:
> >
> > Please pardon the very lengthy post. I have attempted to collect as much
> data as I could think of.
> >
> > Summary:
> > FGS95 with MapServer 5.4.1 on Ubuntu Server, using OGR JOIN results in
> mapserv seg fault when run from browser, works fine from shp2img.
> >
> > Detailed:
> > I have an FGs95 install on Ubuntu Server 9.10, using MapServer 5.4.1 on
> the back with a mixed shapefile/PostGIS datastore, GeoMoose 2.2 front-end.
> Everything is working very nicely except for my current problem.
> >
> > I have a need to color polygons stored in a shapefile, CLASSified based
> on attributes in an external csv-file. Guidance found in the ether
> indicates that the only way to do this with MapServer is to use an OGR
> connection between the shapefile and the csv-file.
> > Using tips found here and there I have been able to construct a SELECT
> statement in the DATA directive that allows shp2img to create a PNG that
> looks just like I hoped it would (see attached), but I must confess that I
> don't fully understand how as the SELECT statement does not look like what
> I am used to seeing in some proprietary products. I am clearly in need of
> an OGR education (with lots of example code).
> >
> > The LAYER section in the mapfile is
> >
> > LAYER # Parish Boundary Polygon Outline Layer
> >  NAME 'parishes_on_boiladv'
> >  CONNECTIONTYPE OGR
> >  CONNECTION "webmaps_parishes.shp"
> >  DATA "SELECT * FROM webmaps_parishes LEFT JOIN 'bwa.csv'.bwa ON
> webmaps_parishes.FIPS = bwa.FIPS"
> >  STATUS default
> >  TYPE polygon
> >  CLASSITEM "PercentageOut"
> >  CLASS
> >    EXPRESSION ([PercentageOut] > 0 AND [PercentageOut] <= 10)
> >    NAME "0 - 10%"
> >    STYLE
> >      COLOR 56 168 0
> >    END
> >  END #class
> > (continues with several more classes).
> >
> > The shapefile and csv-file are stored in the same directory. Both have a
> field "FIPS" which is the field I wish to join on. The "PercentageOut"
> field is in the csv-file. The DATA statement appears to work, but I looks
> really odd to me.
> >
> > Is there a way to get a table output from the OGR JOIN to study?
> >
> > I have set DEBUG 5 at the MAP level and the LAYER level to troubleshoot,
> but the process segfaults before any error is written to the ms_error
> file. The Apache and system logs contain only this when testing from
> localhost:
> >
> > /opt/fgs/www/logs/error_log:
> > [Thu Aug 12 14:53:02 2010] [error] [client 127.0.1.1] Premature end of
> script headers: mapserv
> >
> > /var/log/messages:
> > Aug 12 14:53:02 geoview kernel: [12879514.857356] mapserv[24114]:
> segfault at 0 ip 0945e714 sp bf9058dc error 6
> >
> > I saw another post with similar issues suggesting it's a library issue,
> discussing the LD_LIBRARY_PATH environment variable not being set properly
> for the Apache user. As far as I can tell this variable points to the
> right place in /opt/fgs/, but to be certain I added a SetEnv/PassEnv
> statement in the fgs-version of httpd.conf without any change in behavior.
> >
> > In both /opt/fgs/etc/conf/httpd.conf and the local user environment I
> have
> > LD_LIBRARY_PATH set to /opt/fgs/lib:/opt/fgs/www/lib.
> >
> > Is there a way to see the environment for the Apache user? I don't know
> how important this is. As mentioned everything else has been and is
> working very well.
> >
> > Could there be some other conflicting system library picked up?
> >
> > The URL I test with is
> > /cgi-
> bin/mapserv?map=/opt/fgs/apps/geomoose2/maps/sdwp/boil_adv/webmaps_boil_ad
> visories.map&mode=map
> > and I have confirmed all works fine when pointing the URL to other
> mapfiles.
> >
> > I set the file and directory permissions to full access to all users
> temporarily to test and there is no difference in behavior.
> >
> > When I run shp2img on the same mapfile the correct image is returned and
> there are no errors indicated in the ms_error file. The only oddity I see
> is in the path used by OGROpen:
> >  msLoadMap(): 0.033s
> >  msOGRFileOpen(webmaps_parishes.shp)...
> >
>  OGROPen(/opt/fgs/apps/geomoose2/maps/sdwp/boil_adv/./webmaps_parishes.shp
> )
> >  msConnPoolRegister(parishes_on_boiladv,webmaps_parishes.shp,0x9fdeb68)
> >  msOGRFileWhichShapes: Setting spatial filter to -10515009.640986
> 3370567.000000 -9840476.359014 3918467.000000
> >  msOGRFileNextShape: Returning shape=0, tile=0
> > *** 62 shapes snipped here, there are 64 total polygons ***
> >  msOGRFileNextShape: Returning shape=63, tile=0
> >  msOGRFileNextShape: Returning MS_DONE (no more shapes)
> >  msOGRLayerClose(webmaps_parishes.shp).
> >
>  msOGRFileClose(/opt/fgs/apps/geomoose2/maps/sdwp/boil_adv/./webmaps_paris
> hes.shp,-1).
> >  msConnPoolRelease(parishes_on_boiladv,webmaps_parishes.shp,0x9fdeb68)
> >  msConnPoolClose(webmaps_parishes.shp,0x9fdeb68)
> >  msDrawMap(): Layer 0 (parishes_on_boiladv), 0.118s
> >  msDrawMap(): Drawing Label Cache, 0.000s
> >  msDrawMap() total time: 0.126s
> >  msSaveImage() total time: 0.311s
> >  msFreeMap(): freeing map at 0x9d36ac8.
> >  freeLayer(): freeing layer at 0x9d3d7d8.
> >  shp2img total time: 0.472s
> >
> > What else can I test?
> >
> > If you made it this far, thanks for taking the time to read!
> >
> > I am very grateful for any and all advice.
> > ----------------------
> > Johan Forsman
> > Geologist
> > Safe Drinking Water Program
> > Louisiana Department of Health and Hospitals
> > Office of Public Health
> > Telephone: 225.342.7309
> > Telefax: 225.342.7303
> >
> >
> >
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> > mapserver-users at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/mapserver-users
> >
> >