[postgis-users] 回复:Re: PostGIS crash on ST_ConcaveHull

[耳辰]

Many thanks,

zhen





  	
 陈振 
阿里巴巴  
 电话：057128223456-83773183 
 邮箱：erchen.cz at alibaba-inc.com 
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发件人：Paul Ramsey<pramsey at cleverelephant.ca>
日　期：2023年08月18日 23:12:14
收件人：耳辰<erchen.cz at alibaba-inc.com>; PostGIS Users Discussion<postgis-users at lists.osgeo.org>
抄　送：宋震(凡玺)<songzhen.sz at alibaba-inc.com>; 谢炯<xiejiong.xj at alibaba-inc.com>
主　题：Re: [postgis-users] PostGIS crash on ST_ConcaveHull

Thanks, yes a crash is a bug. I have confirmed it exists in GEOS, and filed an issue

https://github.com/libgeos/geos/issues/946

P


On Aug 18, 2023, at 6:03 AM, 耳辰 <erchen.cz at alibaba-inc.com> wrote:

Hi guys,

I met a postgis crash when tried to use ST_ConvaveHull function with a multipoint, in postgis 3.3.2 and Geos 3.11.2 :

select ST_ConcaveHull('MULTIPOINT ((113.56577197798602 22.80081530883069),(113.565723279387 22.800815316487014),(113.56571548761124 22.80081531771092),(113.56571548780202 22.800815317674463),(113.56577197817877 22.8008153088047),(113.56577197798602 22.80081530883069))', 0.75);

The crash stack are listed:
#0  0x0000ffff84e02210 in geos::triangulate::tri::Tri::getIndex(geos::triangulate::tri::Tri const*) const () from /home/erchen.cz/pgsql15/lib/libgeos.so.3.11.2
#1  0x0000ffff84ce74c0 in geos::algorithm::hull::HullTriangulation::nextBorderTri(geos::algorithm::hull::HullTri*) ()
   from /home/erchen.cz/pgsql15/lib/libgeos.so.3.11.2
#2  0x0000ffff84ce7698 in geos::algorithm::hull::HullTriangulation::traceBoundary(geos::triangulate::tri::TriList<geos::algorithm::hull::HullTri>&) ()
   from /home/erchen.cz/pgsql15/lib/libgeos.so.3.11.2
#3  0x0000ffff84ce79d4 in geos::algorithm::hull::HullTriangulation::traceBoundaryPolygon(geos::triangulate::tri::TriList<geos::algorithm::hull::HullTri>&, geos::geom::GeometryFactory const*) ()
   from /home/erchen.cz/pgsql15/lib/libgeos.so.3.11.2
#4  0x0000ffff84ce1f28 in geos::algorithm::hull::ConcaveHull::toGeometry(geos::triangulate::tri::TriList<geos::algorithm::hull::HullTri>&, geos::geom::GeometryFactory const*) () from /home/erchen.cz/pgsql15/lib/libgeos.so.3.11.2
#5  0x0000ffff84ce29d4 in geos::algorithm::hull::ConcaveHull::getHull() ()
   from /home/erchen.cz/pgsql15/lib/libgeos.so.3.11.2
#6  0x0000ffff8e54818c in GEOSConcaveHull_r ()
   from /home/erchen.cz/pgsql15/lib/libgeos_c.so.1….

It seemed that geos was failed to triangulate the multipoint and then crashed … Is this a bug of geos?

Any comment is welcomed.
Regards,

Zhen

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