[gdal-dev] Crash in GEOS iterating through the layers in a PBF-file loaded with the MVT driver in GDAL 3.12.4#2

Mon Jun 8 05:21:22 PDT 2026

Hello Roman,

Could you please share your input file, either in a GitHub issue or to me
by email? I don't recall a recent bug like this, so you may have found a
new issue.

Thanks,
Dan

On Mon, Jun 8, 2026 at 7:17 AM Roman Plöhn via gdal-dev <
gdal-dev at lists.osgeo.org> wrote:

> Hello,
>
> in our company we since many years use GDAL (for building C++ software for
> Windows only) from VCPKG.
>
> The GDAL version used in the most recent VCPKG is 3.12.4#2, in which I
> encounter a reproducable crash in RELEASE builds when opening a file
> downloaded from a Map-Tiles server, as soon as I iterate through its layers.
>
> My main question about this problem is if this problem is already fixed in
> a more recent GDAL version ... if so I could send the VCPKG-maintainers a
> feature request to ask them to update the GDAL package in there to a
> version, where it doesn't crash anymore.
>
> Below is a description of the problem. If needed I can send the file in
> question.
>
> For us this is a serioes issue, because it hinders us from using a recent
> version of VCPKG at all (we even use the dependend lib mapnik, which needs
> GDAL).
>
> I really hope someone can help me ...
>
> Best regards,
>
> have a nice day,
>
> Roman
>
>
>
>
> The function I use to reproduce the crash is quite simpel:
>
> auto GetLayerFeaureFIDs( OGRLayer& layer ) -> std::vector< GIntBig >
> {
> std::cout << "Processing layer '" << layer.GetName() << "'...\n";
>
> std::vector< GIntBig > fids;
>
> OGRFeature* feature = layer.GetNextFeature();
>
> for ( ; feature != nullptr; feature = layer.GetNextFeature() )
> {
> if ( nullptr == feature )
> {
> std::cout << "Got a null feature from layer '" << layer.GetName() << "'.
> Skipping it.\n";
> continue;
> }
>
> fids.push_back( feature->GetFID() );
> }
>
> return fids;
> }
>
> It doesn't happen for each layer, i.e. in my DEBUG build, where no crash
> happens, an error is reported about a thrown TopologyException:
>
> Debug: GDAL: GDALOpen(C:\Projects\TestGdal\x64\Debug\43.pbf,
> this=000001D7A8789410) succeeds as MVT. (code: 0)
> Processing layer 'boundary'...
> Processing layer 'landcover'...
> Failure: TopologyException: side location conflict at 3934.7142857142858
> 3859.8571428571427. This can occur if the input geometry is invalid. (code:
> 1)
> Processing layer 'landuse'...
> Failure: TopologyException: side location conflict at 494.19230769230768
> 2796.5769230769229. This can occur if the input geometry is invalid. (code:
> 1)
> ...
>
> The crash is a Access Violation, the top of the call-stack looks like this:
>
>   [Inline Frame] geos.dll!geos::geom::CoordinateXY::equals2D(const
> geos::geom::CoordinateXY &) Line 106 C++
>   [Inline Frame]
> geos.dll!geos::index::kdtree::KdTree::queryNodePoint(geos::index::kdtree::KdNode
> * currentNode, const geos::geom::Coordinate & odd, bool) Line 235 C++
>   geos.dll!geos::index::kdtree::KdTree::query(const geos::geom::Coordinate
> & queryPt) Line 289 C++
>   [Inline Frame]
> geos.dll!geos::noding::snapround::HotPixelIndex::find(const
> geos::geom::Coordinate &) Line 146 C++
>   geos.dll!geos::noding::snapround::HotPixelIndex::addRounded(const
> geos::geom::CoordinateXYZM & pRound) Line 48 C++
>   [Inline Frame]
> geos.dll!geos::noding::snapround::HotPixelIndex::add(const
> geos::geom::CoordinateXYZM &) Line 90 C++
>   [Inline Frame]
> geos.dll!geos::noding::snapround::HotPixelIndex::addNodes::__l2::<lambda_8c47a75e4bac7a256ab75080e3e5d5f0>::operator()(const
> geos::geom::CoordinateXYZM &) Line 127 C++
>
> geos.dll!geos::geom::CoordinateSequence::forEach<<lambda_8c47a75e4bac7a256ab75080e3e5d5f0>>(geos::noding::snapround::HotPixelIndex::addNodes::__l2::<lambda_8c47a75e4bac7a256ab75080e3e5d5f0>
> && fun) Line 701 C++
>   geos.dll!geos::noding::snapround::HotPixelIndex::addNodes(const
> geos::geom::CoordinateSequence * pts) Line 130 C++
>
> geos.dll!geos::noding::snapround::SnapRoundingNoder::addIntersectionPixels(std::vector<geos::noding::SegmentString
> *,std::allocator<geos::noding::SegmentString *>> & segStrings) Line 85 C++
>
> geos.dll!geos::noding::snapround::SnapRoundingNoder::snapRound(std::vector<geos::noding::SegmentString
> *,std::allocator<geos::noding::SegmentString *>> & inputSegStrings,
> std::vector<geos::noding::SegmentString
> *,std::allocator<geos::noding::SegmentString *>> & resultNodedSegments)
> Line 70 C++
>
> geos.dll!geos::operation::overlayng::EdgeNodingBuilder::node(std::vector<geos::noding::SegmentString
> *,std::allocator<geos::noding::SegmentString *>> * segStrings) Line 122 C++
>   geos.dll!geos::operation::overlayng::EdgeNodingBuilder::build(const
> geos::geom::Geometry * geom0, const geos::geom::Geometry * geom1) Line 104
> C++
>   geos.dll!geos::operation::overlayng::OverlayNG::computeEdgeOverlay()
> Line 227 C++
>   geos.dll!geos::operation::overlayng::OverlayNG::getResult() Line 195 C++
>   geos.dll!geos::operation::overlayng::OverlayNG::overlay(const
> geos::geom::Geometry * geom0, const geos::geom::Geometry * geom1, int
> opCode, const geos::geom::PrecisionModel * pm) Line 100 C++
>   geos.dll!geos::operation::overlayng::OverlayNGRobust::overlaySR(const
> geos::geom::Geometry * geom0, const geos::geom::Geometry * geom1, int
> opCode) Line 295 C++
>   geos.dll!geos::operation::overlayng::OverlayNGRobust::Overlay(const
> geos::geom::Geometry * geom0, const geos::geom::Geometry * geom1, int
> opCode) Line 147 C++
>   geos.dll!geos::geom::HeuristicOverlay(const geos::geom::Geometry * g0,
> const geos::geom::Geometry * g1, int opCode) Line 194 C++
>   geos.dll!geos::geom::Geometry::intersection(const geos::geom::Geometry *
> other) Line 616 C++
>   [Inline Frame]
> geos_c.dll!GEOSIntersection_r::__l2::<lambda_3988e1633fcf92bee6886158a6950fe9>::operator()()
> Line 1322 C++
>   geos_c.dll!execute<`anonymous
> namespace'::InterruptManager,<lambda_3988e1633fcf92bee6886158a6950fe9>,0>(GEOSContextHandle_HS
> * extHandle,
> GEOSIntersection_r::__l2::<lambda_3988e1633fcf92bee6886158a6950fe9> && f)
> Line 521 C++
>   geos_c.dll!GEOSIntersection_r(GEOSContextHandle_HS * extHandle, const
> geos::geom::Geometry * g1, const geos::geom::Geometry * g2) Line 1326 C++
>   gdal.dll!BuildGeometryFromTwoGeoms(const OGRGeometry * poSelf, const
> OGRGeometry * poOtherGeom, GEOSGeom_t *(*)(GEOSContextHandle_HS *, const
> GEOSGeom_t *, const GEOSGeom_t *) pfnGEOSFunction_r) Line 3814 C++
>   gdal.dll!OGRMVTLayer::GetNextRawFeature() Line 1381 C++
>   [Inline Frame]
> gdal.dll!OGRGetNextFeatureThroughRaw<OGRMVTLayerBase>::GetNextFeature()
> Line 513 C++
>   gdal.dll!OGRMVTLayerBase::GetNextFeature() Line 144 C++
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