Bug report #9835

QGIS crashes when using "avoid intersection" on problematic layer

Added by Oliver Story almost 10 years ago. Updated over 9 years ago.

Affected QGIS version:2.2.0 Regression?:No
Operating System:Linux Easy fix?:No
Pull Request or Patch supplied:No Resolution:fixed/implemented
Crashes QGIS or corrupts data:Yes Copied to github as #:18366


I am trying to add a new feature to a shapefile polygon layer. The new feature is to cover the inner ring of another feature on the same layer.

In "snapping options" I have ticked "avoid intersection" for that layer.

I click the "add feature" tool, then left-click several times to trace around the desired area. When I right-click, QGIS crashes.

I've tried running in a terminal and receive the following error:

ERROR 1: TopologyException: found non-noded intersection between LINESTRING (149.031 -35.6627, 149.029 -35.6639) and LINESTRING (149.027 -35.6684, 149.032 -35.66) at 149.03040196127108 -35.662914069844454
QGIS died on signal 11Could not attach to process.  If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
No thread selected
No stack.
gdb returned 0
Aborted (core dumped)

I have attached the layer file I'm trying to edit.

Vegetation_combined.shp (2.76 MB) Oliver Story, 2014-03-22 10:54 PM

Vegetation_combined.dbf (651 KB) Oliver Story, 2014-03-22 10:54 PM

Vegetation_combined.prj (143 Bytes) Oliver Story, 2014-03-22 10:54 PM

Vegetation_combined.qpj (257 Bytes) Oliver Story, 2014-03-22 10:54 PM

Vegetation_combined.shx (14.1 KB) Oliver Story, 2014-03-22 10:54 PM


#1 Updated by Oliver Story almost 10 years ago

Additional information: the shapefile causing the issues was created in QGIS by merging together two other shapefiles, and as a result contains a lot of overlapping polygons. I have not done exhaustive testing of different shapefiles, however can report that the error does not occur when I am using just one of the source shapefiles (which does not contain the non-noded intersection referred to in the error message).

#2 Updated by Jürgen Fischer over 9 years ago

  • Category set to Digitising

#3 Updated by Giovanni Manghi over 9 years ago

  • Resolution set to fixed/implemented
  • Status changed from Open to Closed

does not happen in latest master, reopen if necessary.

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