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
[EMAIL PROTECTED]
404.730.8026
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