[postgis-tickets] [PostGIS] #4217: ST_Subdivide() - segfault

[PostGIS]

#4217: ST_Subdivide() - segfault
------------------------------------+---------------------------
 Reporter:  morena                  |      Owner:  pramsey
     Type:  defect                  |     Status:  new
 Priority:  high                    |  Milestone:  PostGIS 2.5.1
Component:  postgis                 |    Version:  2.5.x
 Keywords:  ST_Subdivide, segfault  |
------------------------------------+---------------------------
 How to reproduce the issue:

 Subdivide attached geometry using ST_Subdivide() with max_vertices = 10 or
 fewer vertices (operation succeds for max_vertices > 10)
 {{{
 ogr2ogr -f "PostgreSQL" -overwrite PG:"dbname=dev" "geom_layer.geojson"
 -nln public.geom_layer

 DROP TABLE IF EXISTS public.geom_layer_subdivided;
 CREATE TABLE public.geom_layer_subdivided AS
 SELECT ST_Subdivide(wkb_geometry,10) AS geom
 FROM public.geom_layer
 ;

 server closed the connection unexpectedly
         This probably means the server terminated abnormally
         before or while processing the request.
 The connection to the server was lost. Attempting reset: Failed.
 }}}

 {{{
 syslog message:
 segfault at 0 ip 00007f1e461ec8f5 sp 00007fffff02ad28 error 4 in
 postgis-2.5.so[7f1e46181000+bb000]
 }}}

 Geometry checks:
 {{{
 SELECT DISTINCT ST_IsValid(wkb_geometry) FROM public.geom_layer;
  st_isvalid
 ------------
  t
 (1 row)
 SELECT ST_NPoints(wkb_geometry) AS geom_num_points FROM public.geom_layer;
  geom_num_points
 ------
   212
 (1 row)
 }}}

 Linux Version
 {{{
 uname -a
 Linux 4.9.0-7-amd64 #1 SMP Debian 4.9.110-3+deb9u2 (2018-08-13) x86_64
 GNU/Linux
 }}}

 PostgreSQL Version
 {{{
 SELECT version();
 PostgreSQL 11.0 on x86_64-pc-linux-gnu, compiled by gcc (Debian
 6.3.0-18+deb9u1) 6.3.0 20170516, 64-bit
 }}}

 PostGIS Version
 {{{
 SELECT PostGIS_Full_Version();
 POSTGIS="2.5.1dev r16947" [EXTENSION] PGSQL="110" GEOS="3.7.0-CAPI-1.11.0
 673b9939" PROJ="Rel. 5.2.0, September 15th, 2018" GDAL="GDAL 2.3.2,
 released 2018/09/21" LIBXML="2.9.4" RASTER
 }}}

-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/4217>
PostGIS <http://trac.osgeo.org/postgis/>
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