[mapserver-users] [BUG] MapServer 5.4.2 going into an endless loop!

[P Kishor]

On Fri, Nov 20, 2009 at 12:36 PM, Steve Lime <Steve.Lime at dnr.state.mn.us> wrote:
> Does 5.6 exhibit the problem? Does a straight CGI call (mode=map)
> exhibit
> the problem? -Steve
>
>>>> paalkr <pal.kristensen at statkart.no> 11/20/09 11:37 AM >>>
>
> Hi!
>
> I have discovered a situation where MapServer seems to enter an endless
> loop
> and uses all the CPU power available on a server. I have managed to
> track
> down the specific feature in our postgis database that causes MapServer
> to
> hang. A database dump containing only this feature and a working mapfile
> are
> attached.

Don't mean to hijack Pål's thread, but I reported a similar issue a
while back. I did not create a ticket along with data that could
reproduce simply because, for now, it is majorly tricky for me to do
so, but the issue is almost exactly the same --

It happens with GetFeatureInfo... zoom in too much, and MapServer goes
into an endless loop. Interestingly, exactly the same query (caught
via the debugging logs) given to pg directly (via pgAdmin) works fine
and returns results, but now via MS. The CPU spikes up, there is no
result returned, and the browser keeps on waiting.

I will try and put together a reproducible case together so the
developers are able to look into it.


>
> The really strange thing is that this feature does not always fail to
> draw,
> the situation does only occur with some specific BBOX's in a WMS GetMap
> request. A working and a non working request are posted below. The only
> difference between the requests is that the bbox in the working one is
> extended with 1000 meters to the east.
>
> I have tested this on MapServer 5.4.2 on Linux and Windows, with the
> same
> result. I also tried it on an old MapServer 5.0.0 (windows) that still
> lays
> around, and the error was NOT present on 5.0.0, where both the requests
> below did work.
>
> NOT WORKING (>5.0.0)
> http://localhost/cgi-bin/topo2?LAYERS=topo2_WMS&FORMAT=image%2Fjpeg&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&SRS=EPSG%3A32632&BBOX=513024,6792928,599680,6879584&WIDTH=256&HEIGHT=256
>
> WORKING:
> http://localhost/cgi-bin/topo2?LAYERS=topo2_WMS&FORMAT=image%2Fjpeg&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&SRS=EPSG%3A32632&BBOX=513024,6792928,600680,6879584&WIDTH=256&HEIGHT=256
>
> Same information are provided in ticket
> http://trac.osgeo.org/mapserver/ticket/3207 #3207
>
> Mapfile: http://n2.nabble.com/file/n4037146/topo2.zip
> db_dump: http://n2.nabble.com/file/n4037146/n2000_arealdekkeflate.zip
>
> Regards,
> Pål Kristensen
> The Norwegian Mapping Authority
>
>
> -----
>
> Regards,
> Pål Kristensen
> --
> View this message in context:
> http://n2.nabble.com/BUG-MapServer-5-4-2-going-into-an-endless-loop-tp4037991p4037991.html
> Sent from the Mapserver - User mailing list archive at Nabble.com.
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-- 
Puneet Kishor http://www.punkish.org
Carbon Model http://carbonmodel.org
Charter Member, Open Source Geospatial Foundation http://www.osgeo.org
Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor
Nelson Institute, UW-Madison http://www.nelson.wisc.edu
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