topology: crash when loading topogeometry (regression)

[rulus]

Recent versions of the 2.2 branch fail to load (some?) topogeometries; using the toTopoGeom function leads to a database crash.

Using gdb I got this backtrace:

Program received signal SIGSEGV, Segmentation fault.
_box2d_to_hexwkb (bbox=bbox@entry=0x99, srid=31370) at postgis_topology.c:126
126	  p.x = bbox->xmin;
(gdb) bt
#0  _box2d_to_hexwkb (bbox=bbox@entry=0x99, srid=31370) at postgis_topology.c:126
#1  0x00007efe26269757 in cb_getEdgeByFace (topo=0x55e7c0fa68d0, ids=0x7ffd4e19c098, numelems=0x7ffd4e19c0a4, fields=153, box=0x99) at postgis_topology.c:914
#2  0x00007efe2792f115 in ?? () from /usr/lib/liblwgeom-2.2.so.2
#3  0x00007efe279307bf in ?? () from /usr/lib/liblwgeom-2.2.so.2
#4  0x00007efe27935e88 in lwt_AddLine () from /usr/lib/liblwgeom-2.2.so.2
#5  0x00007efe27936642 in lwt_AddPolygon () from /usr/lib/liblwgeom-2.2.so.2
#6  0x00007efe2626fbc5 in TopoGeo_AddPolygon (fcinfo=0x55e7c0f9f7e0) at postgis_topology.c:4426
#7  0x000055e7c022e496 in ?? ()
#8  0x000055e7c0230e6d in ExecProject ()
#9  0x000055e7c0243568 in ExecResult ()
#10 0x000055e7c0229d18 in ExecProcNode ()
#11 0x000055e7c0226f5e in standard_ExecutorRun ()
#12 0x000055e7c0321247 in ?? ()
#13 0x000055e7c0322bc0 in PortalRunFetch ()
#14 0x000055e7c024b6bd in ?? ()
#15 0x00007efe3b597b6b in ?? () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#16 0x00007efe3b5943f3 in ?? () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#17 0x00007efe3b597bf1 in ?? () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#18 0x00007efe3b5943f3 in ?? () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#19 0x00007efe3b596aad in ?? () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#20 0x00007efe3b596cd2 in plpgsql_exec_function () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#21 0x00007efe3b58bd49 in plpgsql_call_handler () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#22 0x000055e7c022ae83 in ?? ()
#23 0x00007efe3b590cb4 in ?? () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#24 0x00007efe3b5922c9 in ?? () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#25 0x00007efe3b594731 in ?? () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#26 0x00007efe3b596aad in ?? () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#27 0x00007efe3b596cd2 in plpgsql_exec_function () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#28 0x00007efe3b58bd49 in plpgsql_call_handler () from /usr/lib/postgresql/9.4/lib/plpgsql.so
#29 0x000055e7c022ae83 in ?? ()
#30 0x000055e7c0230e6d in ExecProject ()
#31 0x000055e7c0231281 in ExecScan ()
#32 0x000055e7c0229cc8 in ExecProcNode ()
#33 0x000055e7c0231228 in ExecScan ()
#34 0x000055e7c0229c78 in ExecProcNode ()
#35 0x000055e7c02409b9 in ExecModifyTable ()
#36 0x000055e7c0229d08 in ExecProcNode ()
#37 0x000055e7c0226f5e in standard_ExecutorRun ()
#38 0x000055e7c03218c8 in ?? ()
#39 0x000055e7c0321b00 in ?? ()
#40 0x000055e7c0322734 in PortalRun ()
#41 0x000055e7c031f4e3 in PostgresMain ()
#42 0x000055e7c00e8773 in ?? ()
#43 0x000055e7c02c950a in PostmasterMain ()
#44 0x000055e7c00e990c in main ()

The issue is introduced in r14226 (found using git bisect), which relates to ticket #3321.

Last working version in the 2.2 branch is: PostgreSQL 9.4.5 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 5.2.1-23) 5.2.1 20151028, 64-bit "POSTGIS="2.2.1dev r14218" GEOS="3.5.0-CAPI-1.9.0 r4084" PROJ="Rel. 4.9.2, 08 September 2015" GDAL="GDAL 2.0.1, released 2015/09/15" LIBXML="2.9.3" LIBJSON="0.11.99" TOPOLOGY RASTER

[strk]

Can you share a small testcase to reproduce the problem ?

[strk]

Your backtrace looks like a mismatch between the client code and the library code (ie: unhandled ABI change) — did you start from a clean build ?

[rulus]

I tried starting from a clean build, maybe something went wrong there. I'll retry completely from scratch now.

This triggers the crash for me (on an empty database):

create extension postgis;
create extension postgis_topology;

create table grondwaterlichamen (
  id serial primary key,
  naam varchar
);

select createtopology('gwl', 31370, 0.01);
select topology.AddTopoGeometryColumn('gwl', 'public', 'grondwaterlichamen', 'topogeom', 'MULTIPOLYGON');

insert into grondwaterlichamen (naam, topogeom)
select 'test', topology.toTopoGeom(st_geomfromewkt('SRID=31370;POLYGON((30 10, 40 40, 20 40, 10 20, 30 10))'), 'gwl', 1, 0.01);

[rulus]

Recompiling from a new copy of the source didn't resolve the issue; maybe some files of the previous version still remain on my system? I'm not sure how to get rid of them.

Can you maybe give me a hint on how to do a completely new build? What I currently do is

sudo make uninstall
make clean
./autogen.sh
./configure --enable-debug
make
sudo make install
sudo ldconfig

[strk]

if you're building from git you might want to try {{ git clean -fX }}

anyway, if you can provide the data to reproduce this i'll be happy to try it out

[rulus]

Thanks! It really fails with the simplest geometry here (see testcase in comment 3).

[strk]

No crash here:

t3416=# create extension postgis;
CREATE EXTENSION
t3416=# create extension postgis_topology;
CREATE EXTENSION
t3416=#
t3416=# create table grondwaterlichamen (
t3416(#   id serial primary key,
t3416(#   naam varchar
t3416(# );
CREATE TABLE
t3416=#
t3416=# select createtopology('gwl', 31370, 0.01);
 createtopology
----------------
              1
(1 row)

t3416=# select topology.AddTopoGeometryColumn('gwl', 'public', 'grondwaterlichamen', 'topogeom', 'MULTIPOLYGON');
 addtopogeometrycolumn
-----------------------
                     1
(1 row)

t3416=#
t3416=# insert into grondwaterlichamen (naam, topogeom)
t3416-# select 'test', topology.toTopoGeom(st_geomfromewkt('SRID=31370;POLYGON((30 10, 40 40, 20 40, 10 20, 30 10))'), 'gwl', 1, 0.01);
INSERT 0 1
t3416=# select postgis_full_version();
                                                                               postgis_full_version                                                 
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 POSTGIS="2.2.1dev r14534" GEOS="3.4.0dev-CAPI-1.8.0 r4137" PROJ="Rel. 4.8.0, 6 March 2012" GDAL="GDAL 1.11.1, released 2014/09/24" LIBXML="2.9.1" LIBJSON="0.12" TOPOLOGY RASTER
(1 row)

What does your "postgis_full_version()" output say

[rulus]

My current version string is: POSTGIS="2.2.1dev r14534" GEOS="3.5.0-CAPI-1.9.0 r4084" PROJ="Rel. 4.9.2, 08 September 2015" GDAL="GDAL 2.0.1, released 2015/09/15" LIBXML="2.9.3" LIBJSON="0.11.99" TOPOLOGY RASTER

But as you mentioned I might have mixed up different revisions/builds on my system here..

[strk]

what's the output of version() ? (postgresql and word size..)

[strk]

I could reproduce, —enable-debug is what makes a difference. I'm on it.

[rulus]

Thanks! Without the —enable-debug, no crash here either. Good catch!

Output of version is: PostgreSQL 9.4.5 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 5.2.1-23) 5.2.1 20151028, 64-bit

[strk]

(In [14543]) Do not fill object fields when not requested

Fixes #3416 (crash on topology load in debug build)

[strk]

(In [14544]) Do not fill object fields when not requested

Fixes #3416 (crash on topology load in debug build)

[strk]

Fixed with r14543 in 2.2 branch (for 2.2.1). 2.2.0 should be immune so this change does not need an entry in NEWS.

r14544 in trunk (2.3.0).

The bug does not affect liblwgeom, but only the postgresql topology module.