8 Preview 2 crashes on save

[qgib]

Author Name: Redmine Admin (Redmine Admin)
Original Redmine Issue: 314

Redmine category:project_loading/saving
Assignee: Gary Sherman

---

I opened a file created in v.7.4 in version 8 Preview 2. It displayed correctly, with minor exceptions. When I tried to save the file, an empty file was created and qgis crashed.
Saving a simple file created only in version 8 worked fine.

---

• musquash_map.qgs (Redmine Admin)
• points.zip (Redmine Admin)

[qgib]

Author Name: Martin Dobias (@wonder-sk)

---

For now we don't maintain backward compatibility of project files between different QGIS versions, thus situation like this is possible.

I think this might be solved by issuing a warning "your project file is for older version, problems possible".

[qgib]

Author Name: Gavin Macaulay - (Gavin Macaulay -)

---

I've added such a warning (). It currently only appears on the terminal as the project reading code is supposed to be gui independent so can't produce a warning dialog box.

However, if the project file loaded mostly ok, the saving shouldn't then crash. Your .qgs file is quite long and includes lots of layers - are you able to try progressively removing layers to see which layer causes the crash when saving?

[qgib]

Author Name: Redmine Admin (Redmine Admin)

---

The layer causing the problem is the vector point layer "points.shp". It does not appear when I open the project, and trying to open its properties causes QGIS to crash.

Loading the layer in a new project in .8 and then saving the project doesn't cause a crash.

Here's a backtrace for the save:
(gdb) bt
#_0  0xb6d7b0e9 in [[QgsVectorLayer]]::writeXML_ () from /usr/lib/libqgis_gui.so.0
#_3905  0xb6ccd8f8 in [[QgsMapLayer]]::writeXML () from /usr/lib/libqgis_gui.so.0
#_3906  0xb6cca02c in [[QgsMapCanvas]]::writeXML () from /usr/lib/libqgis_gui.so.0
#_3907  0xb6d19ac0 in [[QgsProject]]::write () from /usr/lib/libqgis_gui.so.0
#_3908  0xb6c49c5a in [[QgisApp]]::fileSaveAs () from /usr/lib/libqgis_gui.so.0
#_3909  0xb6dbfa69 in [[QgisApp]]::qt_metacall () from /usr/lib/libqgis_gui.so.0
#_3910  0xb7e542bd in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#_3911  0xb7e544e9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#_3912  0xb765b069 in QAction::triggered () from /usr/lib/libQtGui.so.4
#_3913  0xb765ba07 in QAction::activate () from /usr/lib/libQtGui.so.4
#_10 0xb78b7461 in QMenu::wheelEvent () from /usr/lib/libQtGui.so.4
#_3914 0xb78ba95f in QMenu::mouseReleaseEvent () from /usr/lib/libQtGui.so.4
#_3915 0xb769eeec in QWidget::event () from /usr/lib/libQtGui.so.4
#_3916 0xb78b4a13 in QMenu::event () from /usr/lib/libQtGui.so.4
#_3917 0xb765f7c5 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#_3918 0xb7660a5a in QApplication::notify () from /usr/lib/libQtGui.so.4
#_3919 0xb76b2837 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#_3920 0xb76b1568 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#_3921 0xb76c284e in non-virtual thunk to QDesktopWidget::~QDesktopWidget() ()
   from /usr/lib/libQtGui.so.4
#_3922 0xb7e4668a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#_3923 0xb7e4689d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
---Type <return> to continue, or q <return> to quit---
#_3924 0xb7e48fe7 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#_3925 0xb765f565 in QApplication::exec () from /usr/lib/libQtGui.so.4
#_3926 0x0804c488 in main ()

Here's a backtrace from trying to open the layer's properties window:
(gdb) bt
#_0  0xb6d9efb8 in [[QgsVectorLayerProperties]]::reset ()
   from /usr/lib/libqgis_gui.so.0
#_3905  0xb6d9fee3 in [[QgsVectorLayerProperties]]::QgsVectorLayerProperties ()
   from /usr/lib/libqgis_gui.so.0
#_3906  0xb6d8a6ed in [[QgsVectorLayer]]::showLayerProperties ()
   from /usr/lib/libqgis_gui.so.0
#_3907  0xb7f5c746 in [[QgsLegend]]::legendLayerShowProperties ()
   from /usr/lib/libqgis_legend.so.0
#_3908  0xb7f6e3f1 in [[QgsLegend]]::qt_metacall () from /usr/lib/libqgis_legend.so.0
#_3909  0xb7e662bd in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#_3910  0xb7e664e9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#_3911  0xb766d069 in QAction::triggered () from /usr/lib/libQtGui.so.4
#_3912  0xb766da07 in QAction::activate () from /usr/lib/libQtGui.so.4
#_3913  0xb78c9461 in QMenu::wheelEvent () from /usr/lib/libQtGui.so.4
#_10 0xb78cc95f in QMenu::mouseReleaseEvent () from /usr/lib/libQtGui.so.4
#_3914 0xb76b0eec in QWidget::event () from /usr/lib/libQtGui.so.4
#_3915 0xb78c6a13 in QMenu::event () from /usr/lib/libQtGui.so.4
#_3916 0xb76717c5 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#_3917 0xb7672a5a in QApplication::notify () from /usr/lib/libQtGui.so.4
#_3918 0xb76c4837 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#_3919 0xb76c3568 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#_3920 0xb76d484e in non-virtual thunk to QDesktopWidget::~QDesktopWidget() ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/libQtGui.so.4
#_3921 0xb7e5868a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#_3922 0xb7e5889d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#_3923 0xb78cabd3 in QMenu::exec () from /usr/lib/libQtGui.so.4
#_3924 0xb7f61fd1 in [[QgsLegend]]::handleRightClickEvent ()
   from /usr/lib/libqgis_legend.so.0
#_3925 0xb7f6375d in [[QgsLegend]]::mousePressEvent ()
   from /usr/lib/libqgis_legend.so.0
#_3926 0xb76b0f05 in QWidget::event () from /usr/lib/libQtGui.so.4
#_3927 0xb789db84 in QFrame::event () from /usr/lib/libQtGui.so.4
#_3928 0xb79118c4 in QAbstractScrollArea::viewportEvent ()
   from /usr/lib/libQtGui.so.4
#_3929 0xb7964159 in QAbstractItemView::viewportEvent ()
   from /usr/lib/libQtGui.so.4
#_3930 0xb7910705 in QAbstractScrollArea::minimumSizeHint ()
   from /usr/lib/libQtGui.so.4
#_3931 0xb76717c5 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#_3932 0xb7672a5a in QApplication::notify () from /usr/lib/libQtGui.so.4
#_3933 0xb76c3e7d in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#_3934 0xb76c3568 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#_3935 0xb76d484e in non-virtual thunk to QDesktopWidget::~QDesktopWidget() ()
   from /usr/lib/libQtGui.so.4
---Type <return> to continue, or q <return> to quit---
#_3936 0xb7e5868a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#_3937 0xb7e5889d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#_3938 0xb7e5afe7 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#_36 0xb7671565 in QApplication::exec () from /usr/lib/libQtGui.so.4
#_37 0x0804c488 in main ()

[qgib]

Author Name: Gavin Macaulay - (Gavin Macaulay -)

---

Are you able to attach the points.shp file?

[qgib]

Author Name: Marco Hugentobler (@mhugent)

---

It does not crash for me, even when opening a project created in 0.7.4 in 0.8 with the point shapefile. The content is not ok, but this does not matter since there is no backward compatibility anyway.

[qgib]

Author Name: Gary Sherman (@g-sherman)

---

Based on mhugent's last comment, I'm going to close this bug since it seems to be related to project compatibility.

---

• status_id was changed from Open to Closed
• resolution was changed from to wontfix

[qgib]

Author Name: Anónimo (Anónimo)

---

Milestone Version 0.8 deleted