[QGIS-trac] [Quantum GIS] #2493: ftools: simplify geometries tool crashes/freezes qgis (or throws a pyhton error)

[Quantum GIS]

#2493: ftools: simplify geometries tool crashes/freezes qgis (or throws a pyhton
error)
---------------------------------------------------------+------------------
   Reporter:  lutra                                      |              Owner:  cfarmer      
       Type:  bug                                        |             Status:  new          
   Priority:  critical: causes crash or data corruption  |          Milestone:  Version 1.5.0
  Component:  Python plugins and bindings                |            Version:  HEAD         
   Keywords:                                             |   Platform_version:               
   Platform:  All                                        |           Must_fix:  Yes          
Status_info:  0                                          |  
---------------------------------------------------------+------------------
 The tool seems to not like/not work with multipart geometries, so a
 control should be added. A singlepart version of the problematic vector
 (attached) stills crashes qgis when using the tool.

 Maybe it is a problem with the geometry of the vector I tested,
 nevertheless crash should be avoided.

 With the attached vector "evora_rios" with qgis trunk under Ubuntu 9.10,
 qgis crashes with the following terminal message.


 {{{
 Warning: QObject::setParent: Cannot set parent, new parent is in a
 different thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 <unknown>: Fatal IO error 11 (Resource temporarily unavailable) on X
 server :0.0.
 }}}

 I tried also to obtain a singlepart version ("evora_rios_singlepart", also
 attached here) of the same vector (using the multipart to singleparts tool
 in ftools) and the results are no better as qgis freezes or crashes (same
 message as above)***.

 Under windows xp (qgis trunk/osgeo4w) I get (with the same vectors) python
 errors instead of crashes and freezes. I attach the error message (is the
 same for the multipart and singlepart version of the vector) as image as
 is possible to ctrç-c the error message but then ctrl-v does not work.


 Under Ubuntu 9.04 (and qgis 1.4 from the ubuntugis repository) the crash
 message is slightly different from the one thrown under 9.10


 {{{
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: QPixmap: It is not safe to use pixmaps outside the GUI thread
 Warning: X Error: BadImplementation (server does not implement operation)
 17
   Major opcode: 20 (X_GetProperty)
   Resource id:  0x21
 qgis.bin: ../../src/xcb_io.c:242: process_responses: Assertion `(((long)
 (dpy->last_request_read) - (long) (dpy->request)) <= 0)' failed.
 Aborted
 }}}





 ***
 To notice that also the new plugin "dpsimplify" crashes with the multipart
 version of the attached vector, but with the singlepart version it works
 ok.

-- 
Ticket URL: <https://trac.osgeo.org/qgis/ticket/2493>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats