Bug report #19993

QGIS Crashed running Python code obtained form StackExchnge

Added by Thomas Kibbey over 1 year ago. Updated over 1 year ago.

Status:Rejected
Priority:Normal
Assignee:Thomas Kibbey
Category:PyQGIS Console
Affected QGIS version:3.2.1 Regression?:No
Operating System:64 bit, 32GB Windows 10 Easy fix?:No
Pull Request or Patch supplied:No Resolution:invalid
Crashes QGIS or corrupts data:Yes Copied to github as #:27815

Description

This was the code that caused the crash:

import itertools
layer = iface.activeLayer()
feats = [ feat for feat in layer.getFeatures() ]
selected_feats = []
selected_feats.append(feats[0])
del feats[0]
k=0
while len(feats) !=0:
    for i, feat in enumerate(feats):
        d = selected_feats[k].geometry().distance(feat.geometry())
        if d == 0:
            selected_feats.append(feat)
            k +=1
            del feats[i]
    lines = [ feat.geometry().asPolyline() for feat in selected_feats ]
    epsg = layer.crs().postgisSrid()
    uri = "LineString?crs=epsg:" + str(epsg) + "&field=id:integer""&index=yes" 
    mem_layer = QgsVectorLayer(uri,
                 '4testing_feats_ordered',
                  'memory')
    prov = mem_layer.dataProvider()
    feats = [ QgsFeature() for i in range(len(selected_feats)) ]
    for i, feat in enumerate(feats):
        feat.setAttributes([i])
        feat.setGeometry(QgsGeometry.fromPolyline(lines[i]))
    prov.addFeatures(feats)    
    QgsProject.instance().addMapLayer(mem_layer)

This was the bug report after the crash:

User Feedback

Report Details

Crash ID: e75beb8f185e848f989ceaa0bae49ce173157d10

Stack Trace

SpatialIndex::MVRTree::Data::storeToByteArray :
SpatialIndex::RTree::Data::getShape :
SpatialIndex::RTree::Data::getShape :
QgsSpatialIndex::insertFeature :
QgsSpatialIndex::insertFeature :
QgsProcessingModelOutput::toVariant :
std::_String_alloc<std::_String_base_types<char,std::allocator<char> > >::_Getal :
PyCFunction_FastCallDict :
PyObject_GenericGetAttr :
PyEval_EvalFrameDefault :
PyErr_Occurred :
PyEval_EvalCode :
PyDict_SetItemId :
PyDict_SetItemId :
PyCFunction_FastCallDict :
PyObject_GenericGetAttr :
PyEval_EvalFrameDefault :
PyObject_GenericGetAttr :
PyEval_EvalFrameDefault :
PyErr_Occurred :
PyObject_GenericGetAttr :
PyEval_EvalFrameDefault :
PyErr_Occurred :
PyObject_GenericGetAttr :
PyEval_EvalFrameDefault :
PyObject_GenericGetAttr :
PyEval_EvalFrameDefault :
PyObject_GenericGetAttr :
PyEval_EvalFrameDefault :
PyFunction_FastCallDict :
PyObject_CallFunctionObjArgs :
PyObject_Call :
PyInit_sip :
PyInit_Qsci :
QWidget::event :
QFrame::event :
QAbstractScrollArea::event :
PyInit_Qsci :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QSizePolicy::QSizePolicy :
QSizePolicy::QSizePolicy :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processKeyEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
CallWindowProcW :
DispatchMessageW :
QEventDispatcherWin32::processEvents :
qt_plugin_query_metadata :
QEventLoop::exec :
QCoreApplication::exec :
main :
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 3.2.1-Bonn
QGIS code revision: 1edf372fb8
Compiled against Qt: 5.9.2
Running against Qt: 5.9.2
Compiled against GDAL: 2.2.4
Running against GDAL: 2.2.4

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 10.0.17134

History

#1 Updated by Alessandro Pasotti over 1 year ago

  • Resolution set to invalid
  • Status changed from Open to Rejected

I'm afraid there is nothing we can do, QGIS C++ is wrapped by SIP binding generator in such a way that you can easily crash QGIS but you get the power and the speed you need for complex tasks.

If you want to know more about this: http://enki-editor.org/2014/08/23/Pyqt_mem_mgmt.html

#2 Updated by Jürgen Fischer over 1 year ago

  • Description updated (diff)

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