Vector - Sum lines length crashes QGIS

[gislab]

Vector\Analysis\Sum lines length crashes QGIS with these two layers. This might be due to geographic CRS, but still, shouldn't crash.

[gislab]

test data

​http://gis-lab.info/share/sumlines-crash.zip

[lutra]

confirmed under linux. Terminal returns just "seg fault".

[jef]

Looks like this was caused by r12597. In ​http://trac.osgeo.org/qgis/browser/trunk/qgis/python/plugins/fTools/tools/doSumLines.py#L142 doSumLines:412 the output feature now takes ownership of the input polygon, although the input geometry still owns it. That way the geometry is freed twice, when compute ends.

Following change cures that, but as that is probably not the only place with that construct, we'd probably be better of reverting the r12597. Ccing Martin.

Index: python/plugins/fTools/tools/doSumLines.py
===================================================================
--- python/plugins/fTools/tools/doSumLines.py   (revision 12612)
+++ python/plugins/fTools/tools/doSumLines.py   (working copy)
@@ -139,7 +139,7 @@
                                        if inGeom.intersects(i.geometry()):
                                                outGeom = inGeom.intersection(i.geometry())
                                                length = length + distArea.measure(outGeom)
-                       outFeat.setGeometry(inGeom)
+                       outFeat.setGeometry( QgsGeometry(inGeom) )
                        outFeat.setAttributeMap(atMap)
                        outFeat.addAttribute(index, QVariant(length))
                        writer.addFeature(outFeat)

[wonder]

Fixed in r12627: only the copying setGeometry() is used. Thanks Juergen for pointing out.

[dr]

bug is not fixed

[lutra]

This is right on the money, I just found two layers you can download here

​http://mapserver.uevora.pt/~mapserver/

that do always crash qgis when the "sum line lenghts" operation is done.

In the terminal I get only a "seg fault" message.

[lutra]

Well, in the case of the layers I posted it turns that if I save them in another projection (ie epsg 3763) the operation goes well. Weird.

[lutra]

Moreover there are other projection (ie epsg 20790) that I can use to save the original layers that cause qgis crash when the "sum line lenghts" operation is done.

[jef]

fixed in r13724.