Bug report #9835
QGIS crashes when using "avoid intersection" on problematic layer
|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.
#1 Updated by Oliver Story over 5 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).