[geos-devel] signal 11 with GEOS rc4_svn and postgis 1.2.1

[strk at refractions.net]

On Fri, Feb 16, 2007 at 06:50:09PM -0500, Carl Anderson wrote:
> I ran it through XMLTester without any problems.
> 
> I got a production PostGIS and a development PostGIS server to crash 
> with the SQL statement.

Here's my result:

=# select astext(intersection('POLYGON((0 0,0 1,1 1,1 0,0 0))', 'POLYGON((10 10,10 11,11 11,11 10,10 10))'));
 GEOMETRYCOLLECTION EMPTY

PGSQL versioN;

 PostgreSQL 8.1.8 on i486-pc-linux-gnu, compiled by GCC gcc-4.0.gcc-opt (GCC) 4.0.3 (Ubuntu 4.0.3-1ubuntu5)

Postgis versions:

 POSTGIS="1.2.0" GEOS="3.0.0rc4-CAPI-1.3.2" PROJ="Rel. 4.4.9, 29 Oct 2004" USE_STATS
 POSTGIS="1.2.1" GEOS="3.0.0rc4-CAPI-1.3.2" PROJ="Rel. 4.4.9, 29 Oct 2004" USE_STATS

--strk;

> 
> 
> strk at refractions.net wrote:
> >
> >The attached XML can be run by GEOS's XMLTester standalone, to
> >get PostGIS out of the way.
> >It works fine here, with both inlines enabled or disabled.
> >Do you get a segfault on your side ?
> >
> >--strk;
> >
> >On Fri, Feb 16, 2007 at 05:05:51PM -0500, Carl Anderson wrote:
> >> I am getting Signal 11 faults from geos through Postgis  in the
> >> following example,
> >> where the geometries a and b do not really intersect.
> >>
> >>
> >> select intersection(a, b) from
> >>  (select geometry('POLYGON((0 0,0 1,1 1,1 0,0 0))') as a ,
> >>     geometry('POLYGON((10 10,10 11,11 11,11 10,10 10))') as b
> >>  ) as part
> >>
> >>
> >> backtrace from Postgres 8.1.6, PostGIS 1.2.1
> >>
> >>
> >> Reading symbols from /usr/lib/libgeos-3.0.0rc4.so...done.
> >> Loaded symbols for /usr/lib/libgeos-3.0.0rc4.so
> >> Reading symbols from /usr/lib/libstdc++.so.6...done.
> >> Loaded symbols for /usr/lib/libstdc++.so.6
> >> Reading symbols from /lib/libgcc_s.so.1...done.
> >> Loaded symbols for /lib/libgcc_s.so.1
> >> 0x00ecd402 in __kernel_vsyscall ()
> >> (gdb) continue
> >> Continuing.
> >>
> >> Program received signal SIGSEGV, Segmentation fault.
> >> 0x06fd4199 in geos::geom::operator<< () from 
> >/usr/lib/libgeos-3.0.0rc4.so
> >> (gdb) bt
> >> #0  0x06fd4199 in geos::geom::operator<< () from
> >> /usr/lib/libgeos-3.0.0rc4.so
> >> #1  0x06fd42a7 in geos::geom::Coordinate::toString () from
> >> /usr/lib/libgeos-3.0.0rc4.so
> >> #2  0x06fcd98e in geos::algorithm::LineIntersector::toString () from
> >> /usr/lib/libgeos-3.0.0rc4.so
> >> #3  0x0708094b in geos::operation::overlay::OverlayOp::computeOverlay ()
> >> from /usr/lib/libgeos-3.0.0rc4.s
> >> #4  0x07080e90 in geos::operation::overlay::OverlayOp::getResultGeometry
> >> () from /usr/lib/libgeos-3.0.0rc4.so
> >> #5  0x07081905 in geos::operation::overlay::OverlayOp::overlayOp () from
> >> /usr/lib/libgeos-3.0.0rc4.so
> >> #6  0x004a8721 in geos::operation::overlay::overlayOp::operator() ()
> >> from /usr/lib/libgeos_c.so.1
> >> #7  0x004a8a32 in
> >> geos::geom::BinaryOp<geos::operation::overlay::overlayOp> () from
> >> /usr/lib/libgeos_c.so.1
> >> #8  0x004a4ffc in GEOSIntersection () from /usr/lib/libgeos_c.so.1
> >> #9  0x00f95398 in intersection (fcinfo=0xbf7fedb8) at 
> >lwgeom_geos_c.c:882
> >> #10 0x081367fc in ExecMakeFunctionResult (fcache=0x9d82ac0,
> >> econtext=0x99e0a40, isNull=0xbf7ff0ff "",
> >>    isDone=0x0) at execQual.c:1095
> >> (gdb)
> >>
> >>
> >> --
> >> Carl Anderson
> >> GIS Manager Fulton County, Georgia
> >> carl.anderson at co.fulton.ga.us
> >> 404.730.8026
> >>
> >>
> >> _______________________________________________
> >> geos-devel mailing list
> >> geos-devel at geos.refractions.net
> >> http://geos.refractions.net/mailman/listinfo/geos-devel
> >
> >--
> >
> > ()   ASCII Ribbon Campaign
> > /\   Keep it simple!
> >
> >------------------------------------------------------------------------
> >
> ><run>
> ><precisionModel type="FLOATING"/>
> ><case>
> ><a>
> >POLYGON((0 0,0 1,1 1,1 0,0 0))
> ></a>
> ><b>
> >POLYGON((10 10,10 11,11 11,11 10,10 10))
> ></b>
> ><test>
> >	<op name="intersection">GEOMETRYCOLLECTION EMPTY</op>
> ></test>
> ></case>
> >
> ></run>
> >  
> 
> 
> -- 
> Carl Anderson
> GIS Manager Fulton County, Georgia
> carl.anderson at co.fulton.ga.us
> 404.730.8026
> 

-- 

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