Segmentation fault

[karlwettin]

I'm getting a segfault when executing on the current weekly OSM planet.pbf (i.e. exported 2021-06-26) using the github master.

No problems when executing on a limited dataset (sweden.pbf from GeoFabrik).

Any suggestions?

I'll try again as soon as the next weekly planet.pbf is released.

[2021-06-30T20:26:00Z INFO  cosmogony_builder::additional_zones] Ignoring place with id node:4295699280 and country relation:2202162 as parent
[2021-06-30T20:26:00Z INFO  cosmogony_builder::additional_zones] Ignoring place with id node:4295699281 and country relation:2202162 as parent
[2021-06-30T20:26:00Z INFO  cosmogony_builder::additional_zones] Ignoring place with id node:4318991429 and country relation:2103120 as parent
[2021-06-30T20:26:03Z INFO  cosmogony_builder::additional_zones] We'll compute voronois partitions for 14005 parent zones
intersection failure: impossible to build a geometry from a nullptr in "Geometry::intersection
Last error: TopologyException: Input geom 0 is invalid: Self-intersection at or near point 11.341666499999999 8.7999999999999989 at 11.341666499999999 8.799999999999998" (Unknown GEOS error)
intersection failure: impossible to build a geometry from a nullptr in "Geometry::intersection
Last error: TopologyException: Input geom 0 is invalid: Self-intersection at or near point 11.341666499999999 8.7999999999999989 at 11.341666499999999 8.799999999999998" (Unknown GEOS error)
intersection failure: impossible to build a geometry from a nullptr in "Geometry::intersection
Last error: TopologyException: Input geom 0 is invalid: Self-intersection at or near point 11.550000000000001 8.3166669999999989 at 11.550000000000001 8.316666999999998" (Unknown GEOS error)

...

extrude_existing_town: difference failed for node:150968654: NoConstructionFromNullPtr("Geometry::difference\nLast error: TopologyException: Input geom 1 is invalid: Nested shells at or near point -121.29731 38.243600000000001 at -121.29731 38.24360000000000")
extrude_existing_town: difference failed for node:29941752: NoConstructionFromNullPtr("Geometry::difference\nLast error: TopologyException: Input geom 1 is invalid: Nested shells at or near point -89.753559199999998 43.144259999999996 at -89.753559199999998 43.14425999999999")
extrude_existing_town: difference failed for node:1178614100: NoConstructionFromNullPtr("Geometry::difference\nLast error: TopologyException: Input geom 1 is invalid: Self-intersection at or near point 133.2864505703993 44.099531000885996 at 133.2864505703993 44.09953100088599")
extrude_existing_town: difference failed for node:1346990699: NoConstructionFromNullPtr("Geometry::difference\nLast error: TopologyException: Input geom 1 is invalid: Self-intersection at or near point 133.2864505703993 44.099531000885996 at 133.2864505703993 44.09953100088599")
extrude_existing_town: difference failed for node:1080033707: NoConstructionFromNullPtr("Geometry::difference\nLast error: TopologyException: Input geom 1 is invalid: Self-intersection at or near point 133.2864505703993 44.099531000885996 at 133.2864505703993 44.09953100088599")

...

Last error: TopologyException: Input geom 0 is invalid: Self-intersection at or near point 4.0499999999999998 7.8749999999999991 at 4.0499999999999998 7.874999999999999" (Unknown GEOS error)
intersection failure: impossible to build a geometry from a nullptr in "Geometry::intersection
Last error: TopologyException: Input geom 0 is invalid: Self-intersection at or near point 4.0499999999999998 7.8749999999999991 at 4.0499999999999998 7.874999999999999" (Unknown GEOS error)
intersection failure: impossible to build a geometry from a nullptr in "Geometry::intersection
Last error: TopologyException: Input geom 0 is invalid: Self-intersection at or near point 3.7916669999999995 7.9249999999999998 at 3.7916669999999995 7.924999999999999" (Unknown GEOS error)
Failed to compute voronoi for parent relation:3720587: impossible to build a geometry from a nullptr in "Geometry::voronoi
Last error: TopologyException: Input geom 1 is invalid: Self-intersection at or near point 4.3749999999999991 7.9499999999999993 at 4.3749999999999991 7.949999999999999"
extrude_existing_town: difference failed for node:150963743: NoConstructionFromNullPtr("Geometry::difference\nLast error: TopologyException: Input geom 1 is invalid: Nested shells at or near point -122.78478179999999 45.340228699999997 at -122.78478179999999 45.34022869999999")
extrude_existing_town: difference failed for node:4571365408: NoConstructionFromNullPtr("Geometry::difference\nLast error: TopologyException: Input geom 1 is invalid: Self-intersection at or near point 107.95787713017623 26.570585016953814 at 107.95787713017623 26.57058501695381")
extrude_existing_town: difference failed for node:4571483306: NoConstructionFromNullPtr("Geometry::difference\nLast error: TopologyException: Input geom 1 is invalid: Self-intersection at or near point 107.95787713017623 26.570585016953814 at 107.95787713017623 26.57058501695381")
Segmentation fault (core dumped)

[amatissart]

Thanks for your feedback.

I also noticed that a segmentation fault could occur in some cases. It's probably related to a thread-safety issue in the GEOS binding. But I haven't dug enough into this yet. As the problem seems to occur only when the planet file is used as the input, it will be quite hard to produce a minimal reproducible example.

There is a draft that attempts to make the implementation of voronoi-based cities geometries more robust in #116. This includes a potential workaround for this issue. So you may want to test with this branch.

Alternatively, it's possible to use the flag cosmogony generate --disable-voronoi to disable the step where these voronoi-based polygons are generated. The coverage of cities in the output will be deteriorated though.

[amatissart]

This should be fixed with v0.10.2, even though the root cause is still unclear.

[karlwettin]

Cool, thanks! I'll try it out this weekend and report back.