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

[Carl Anderson]

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