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

[Paul Ramsey]

A good test case, fully self-contained, is always appreciated. Watch
out for things like references to templates you don't include or
font-lists you don't include. After extracting the test case,
reinstall it and ensure it still shows the behavior you want.

Thanks,

P.

On Fri, Nov 20, 2009 at 10:54 AM, P Kishor <punk.kish at gmail.com> wrote:
> 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
> -----------------------------------------------------------------------
> Assertions are politics; backing up assertions with evidence is science
> =======================================================================
> Sent from Mt Horeb, Wisconsin, United States
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