[QGIS-trac] [Quantum GIS] #3366: QgsVectorLayer.committedFeaturesRemoved causes crash in Python

[Quantum GIS]

#3366: QgsVectorLayer.committedFeaturesRemoved causes crash in Python
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   Reporter:  ccrook                                     |              Owner:  borysiasty   
       Type:  bug                                        |             Status:  new          
   Priority:  critical: causes crash or data corruption  |          Milestone:  Version 1.7.0
  Component:  Python plugins and bindings                |            Version:  1.6.0        
   Keywords:                                             |   Platform_version:  XP SP3       
   Platform:  Windows                                    |           Must_fix:  No           
Status_info:  0                                          |  
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 To replicate the problem ..

 1) Open a new QGis project

 2) Open a python console window

 3) Enter the following code

 {{{
 from PyQt4.QtCore import *
 def handler():
     print "Deleting features"

 # Create a scratch layer and connect to committedFeaturesRemoved signal
 type="Point"
 name = "Test"
 layer = QgsVectorLayer(type, name, "memory")
 QgsMapLayerRegistry.instance().addMapLayer(layer)
 qgis.utils.iface.mapCanvas().setCurrentLayer(layer)
 QObject.connect(layer, SIGNAL("committedFeaturesRemoved(const QString &,
 const QgsFeatureIds & )"),handler)
 }}}
 This will create a layer called test

 4) Set the layer to be editable

 5) Add a point to the layer

 6) Commit the change (save the layer)

 7) Select the point

 8) Delete the point

 9) Commit the change - this causes the crash.

 This happens consistently for me in QGis versions 1.6 and 1.7 r14962

 Operating system is windows XP SP3

 I've had a look at it as far as I can in the Visual Studio debugger. The
 crash appears to happen in the generated moc_.. file where the python
 signal is implemented, and the message is:

   Unhandled exception at 0x0372ba7c in qgis.exe: 0xC000001E:  An attempt
 was made to execute an   invalid lock sequence.

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Ticket URL: <http://trac.osgeo.org/qgis/ticket/3366>
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