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Hi Martin

The example shapefile does not lead to a crash on my system. Which version of geos are you using? I'm using 3.0.0 (also on ubuntu).

Marco

I'm still using geos 2.2.3 from ubuntu.

Replying to [comment:1 mhugent]:

Hi Martin

The example shapefile does not lead to a crash on my system.

Neither on my - Debian testing amd64, GEOS 3.0.0.

Not sure if that's relevant, but what are your snapping options? Do you rely on snapping settings from the general 'Options' menu or do you set them for that given layer in project properties? If the latter, do you also set 'Topological editing' and 'Avoid intersections'?

Can you post a backtrace?

Replying to [comment:3 msieczka]:

Not sure if that's relevant, but what are your snapping options? Do you rely on snapping settings from the general 'Options' menu or do you set them for that given layer in project properties? If the latter, do you also set 'Topological editing' and 'Avoid intersections'?

I use general snapping options, no topological editing, neither avoid intersections. But shouldn't really matter, the crash is somewhere deep inside splitting routines.

Can you post a backtrace?

#0  0x0831c349 in vtable for +cxxabiv1::+si_class_type_info ()
#3905  0x08be8f20 in ?? ()
#3906  0xb73bdf63 in [[QgsGeometry]]::splitPolygonGeometry (this=0x83724e0, splitLine=0x8369698, newGeometries=@0xbf95aeb0) at /home/wonder/qgis/svn/src/core/qgsgeometry.cpp:4909
#3907  0xb73be95f in [[QgsGeometry]]::splitGeometry (this=0x83724e0, splitLine=@0x85c820c, newGeometries=@0xbf95aeb0, topological=false, topologyTestPoints=@0xbf95aeac)
    at /home/wonder/qgis/svn/src/core/qgsgeometry.cpp:3187
#3908  0xb742448c in [[QgsVectorLayer]]::splitFeatures (this=0xb1328fd0, splitLine=@0x85c820c, topologicalEditing=false) at /home/wonder/qgis/svn/src/core/qgsvectorlayer.cpp:1721
#3909  0x08184f22 in [[QgsMapToolSplitFeatures]]::canvasReleaseEvent (this=0x85c81e0, e=0xbf95b4d8) at /home/wonder/qgis/svn/src/app/qgsmaptoolsplitfeatures.cpp:82
#3910  0xb72a50b3 in [[QgsMapCanvas]]::mouseReleaseEvent (this=0x85118b0, e=0xbf95b4d8) at /home/wonder/qgis/svn/src/gui/qgsmapcanvas.cpp:774

Ok, I compiled geos 2.2.3 and I also have the crash.
The geos documentation also gives the reason (see below). I'm going to look for a workaround for geos2 (or an ifdef).

/* May be called on all geometries in GEOS 3.x, returns -1 on error and 1
00374 * for non-multi geometries. Older GEOS versions only accept
00375 * GeometryCollections or Multi* geometries here, and are likely to crash
00376 * when feeded simple geometries, so beware if you need compatibility with
00377 * old GEOS versions.
00378 /
00379 extern int GEOS_DLL GEOSGetNumGeometries(const GEOSGeometry g1);

Replying to [comment:6 mhugent]:

Fixed in 52c76d58 (SVN r9713)

But GEOSGetGeometryN() is fine with simple geometries?

Milestone Version 1.0.0 deleted