DB Crash - Status Stopped - ST_StraightSkeleton and ST_ApproximateMedialAxis

[jvidin]

OS Windows 7 64Bits POSTGRES PostgreSQL 9.3.9, compiled by Visual C++ build 1600, 64-bit POSTGIS 2.2.0

EXTENSION postgis VERSION "2.2.0";

EXTENSION postgis_sfcgal VERSION "2.2.0";

INSERT INTO table (id , geom) VALUES ('110',ST_StraightSkeleton(ST_GeomFromText('POLYGON ((-86.53986 32.35124,-86.54 32.35202,-86.54122 32.35622,-86.5424 32.3611,-86.54368 32.36537,-86.54456 32.36679,-86.54509 32.36723,-86.54565 32.36764,-86.54625 32.36801,-86.54679 32.3683,-86.54744 32.3686,-86.54802 32.36881,-86.5486 32.36897,-86.54911 32.36907,-86.54982 32.36913,-86.55044 32.36911,-86.55379 32.36878,-86.55473 32.36867,-86.55599 32.3686,-86.55683 32.3686,-86.55767 32.36864,-86.5585 32.36873,-86.55933 32.36885,-86.56025 32.36946,-86.563 32.37094,-86.56472 32.37169,-86.56526 32.37209,-86.56575 32.37241,-86.56864 32.37416,-86.57102 32.37512,-86.57266 32.37549,-86.5742 32.3758,-86.57513 32.37597,-86.57586 32.37606,-86.57669 32.3761,-86.57763 32.37607,-86.57857 32.37596,-86.57938 32.37581,-86.57998 32.37565,-86.58203 32.37503,-86.58221 32.37478,-86.58247 32.3743,-86.5828 32.37408,-86.58309 32.37383,-86.58412 32.37257,-86.58475 32.37197,-86.58517 32.37146,-86.58559 32.37084,-86.58817 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[jvidin]

PG_LOG

[robe]

jvidan,

Thanks for reporting. Will look at this right away.

[jvidin]

Thanks, jvidin

[robe]

confirmed on my: PostgreSQL 9.4.4 windows 7 64-bit SFCGAL 1.2.0

[Switching to Thread 1132.0x1568]
0x000000006d5947d2 in libSFCGAL!_ZN6SFCGAL10LineString8addPointERKNS_5PointE () from C:\ming64gcc48\projects\postgresql\rel\pg9.4w64gcc48edb\bin\libSFCGAL.dll
(gdb) bt
#0  0x000000006d5947d2 in libSFCGAL!_ZN6SFCGAL10LineString8addPointERKNS_5PointE () from C:\ming64gcc48\projects\postgresql\rel\pg9.4w64gcc48edb\bin\libSFCGAL.dll
#1  0x000000006d2a6893 in libSFCGAL!_ZN6SFCGAL9algorithm27makeConsistentOrientation3DERNS_19TriangulatedSurfaceE () from C:\ming64gcc48\projects\postgresql\rel\pg9.4w64gcc48edb\bin\libSFCGAL.dll
#2  0x000000006d2a6cff in libSFCGAL!_ZN6SFCGAL9algorithm16straightSkeletonERKNS_7PolygonEbb () from C:\ming64gcc48\projects\postgresql\rel\pg9.4w64gcc48edb\bin\libSFCGAL.dll
#3  0x000000006d2a71d5 in libSFCGAL!_ZN6SFCGAL9algorithm16straightSkeletonERKNS_8GeometryEbNS0_15NoValidityCheckEb () from C:\ming64gcc48\projects\postgresql\rel\pg9.4w64gcc48edb\bin\libSFCGAL.dll
#4  0x000000006d2a72fb in libSFCGAL!_ZN6SFCGAL9algorithm16straightSkeletonERKNS_8GeometryEbb () from C:\ming64gcc48\projects\postgresql\rel\pg9.4w64gcc48edb\bin\libSFCGAL.dll
#5  0x000000006d2be8c0 in sfcgal_geometry_straight_skeleton () from C:\ming64gcc48\projects\postgresql\rel\pg9.4w64gcc48edb\bin\libSFCGAL.dll
#6  0x000000007089228d in sfcgal_straight_skeleton () from C:\ming64gcc48\projects\postgresql\rel\pg9.4w64gcc48edb\lib\postgis-2.2.dll
#7  0x00000001401127b8 in postgres!ExecProject ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

will report upsteam.

[robe]

I see you already reported upstream

related ticket - ​https://github.com/Oslandia/SFCGAL/issues/111

[strk]

The crash seems to be due to an unchecked return from CGAL::create_interior_straight_skeleton_2, which returns 0/null in this case.

I'm not sure what it would mean, exactly, to get a 0…

[strk]

A patch is ready for fixing the crash (upstream, in a PR). You'll still get an exception but at least it'd be safe again to allow for arbitrary queries.

[robe]

FWIW I have winnie monitoring SFCGAL master ready and waiting for the patch to build and that will get included in the next PostGIS 2.2.1dev windows builds (after SFCGAL build)

[robe]

This should no longer crash in SFCGAL 1.2.1+. Note that winnie's experimental 2.2.1dev and 2.3.0dev builds against SFCGAL master, so issue should be fixed on that. The SFCGAL binaries should work fine against PostGIS 2.2.0 if you just want to replace the binaries. Though admittedly I haven't had a chance to test them.

[jvidin]

postgis_sfcgal → Version 2.2.1dev Same polygon as reported early - database does not crash anymore but it fails to create the straightSkeleton, not sure if it is the expected behavior for this release.

ERROR: CGAL failed to create straightSkeleton Error

ERROR: CGAL failed to create straightSkeleton SQL state: XX000

Cheers, Jvidin

[robe]

I think it is. I think this release just fixed the issue of crashing but not how to handle these problem polygons.

[strk]

Confirmed, expected behavior for this release