Bug report #8061
python bindings for legendInterface().groupLayerRelationship() gives segfault
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Severe/Regression | ||
| Assignee: |  Nathan Woodrow | ||
| Category: | Python plugins | ||
| Affected QGIS version: | master | Regression?: | No |
| Operating System: | linux | Easy fix?: | No |
| Pull Request or Patch supplied: | No | Resolution: | |
| Crashes QGIS or corrupts data: | Yes | Copied to github as #: | 16901 |
Description
I have a python plugin which uses legendInterface().groupLayerRelationship() and when trying to port it to new spiv2 api I get this error.
I can reproduce without the plugin using the python console.
- start qgis with no layers
- open python console
- type 'iface.legendInterface().groups()' - returns an empty list
- type 'iface.legendInterface().groupLayerRelationship()' - returns an empty list
- add a map layer
- type 'iface.legendInterface().groups()' - returns an empty list
- type 'iface.legendInterface().groupLayerRelationship()' - segfault
segfault occurs here
0x00007fffcff70db8 in convertFrom_QList_0600QPair_0100QString_0600QList_0100QString (sipCppV=0x1da83a0, sipTransferObj=0x0) at /data/src/qgis/qgis-master/python/core/conversions.sip:1450
1450 PyObject *t1obj = sipConvertFromNewInstance(new QString(sipCpp->at(i).second.at(j)), sipClass_QString, sipTransferObj);
following is a log and backtrace (output in qgslegend.cpp was added by me)
I have assigned Nathan as he has been leading the sipV2 effort
Debug: src/core/qgsmaprenderer.cpp: 723: (render) Rendering completed in (seconds): 0.004 Debug: src/app/legend/qgsapplegendinterface.cpp: 133: (groupLayerRelationship) returning mLegend->groupLayerRelationship() Debug: src/app/legend/qgslegend.cpp: 2234: (groupLayerRelationship) returning list with 1 items Debug: src/app/legend/qgslegend.cpp: 2237: (groupLayerRelationship) k=[] #v=[1] Debug: src/app/legend/qgslegend.cpp: 2239: (groupLayerRelationship) s=[landsat20130613173433257] Program received signal SIGSEGV, Segmentation fault. 0x00007fffcff70db8 in convertFrom_QList_0600QPair_0100QString_0600QList_0100QString (sipCppV=0x1da83a0, sipTransferObj=0x0) at /data/src/qgis/qgis-master/python/core/conversions.sip:1450 1450 PyObject *t1obj = sipConvertFromNewInstance(new QString(sipCpp->at(i).second.at(j)), sipClass_QString, sipTransferObj); (gdb) (gdb) bt #0 0x00007fffcff70db8 in convertFrom_QList_0600QPair_0100QString_0600QList_0100QString (sipCppV=0x1da83a0, sipTransferObj=0x0) at /data/src/qgis/qgis-master/python/core/conversions.sip:1450 #1 0x00007fffd119f2d1 in ?? () from /usr/lib/python2.7/dist-packages/sip.so #2 0x00007fffcf049034 in meth_QgsLegendInterface_groupLayerRelationship (sipSelf=0x26e70e0, sipArgs=0x1568050) at /data/src/qgis/qgis-master/build-debug/python/gui/sipguipart3.cpp:1093 #3 0x00007fffd1402d72 in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0 #4 0x00007fffd1403c38 in PyEval_EvalCodeEx () from /usr/lib/libpython2.7.so.1.0 #5 0x00007fffd1403d72 in PyEval_EvalCode () from /usr/lib/libpython2.7.so.1.0 #6 0x00007fffd1401c3a in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0 #7 0x00007fffd1403c38 in PyEval_EvalCodeEx () from /usr/lib/libpython2.7.so.1.0 #8 0x00007fffd140182e in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0 #9 0x00007fffd1403c38 in PyEval_EvalCodeEx () from /usr/lib/libpython2.7.so.1.0 #10 0x00007fffd140182e in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0 #11 0x00007fffd1402e1b in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0 #12 0x00007fffd1402e1b in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0 #13 0x00007fffd1403c38 in PyEval_EvalCodeEx () from /usr/lib/libpython2.7.so.1.0 #14 0x00007fffd1459c76 in ?? () from /usr/lib/libpython2.7.so.1.0 #15 0x00007fffd14d31be in PyObject_Call () from /usr/lib/libpython2.7.so.1.0 #16 0x00007fffd15374e0 in ?? () from /usr/lib/libpython2.7.so.1.0 #17 0x00007fffd14d31be in PyObject_Call () from /usr/lib/libpython2.7.so.1.0 #18 0x00007fffd14d3ac7 in PyEval_CallObjectWithKeywords () from /usr/lib/libpython2.7.so.1.0 #19 0x00007fffd11a2692 in ?? () from /usr/lib/python2.7/dist-packages/sip.so #20 0x00007fffd0550410 in ?? () from /usr/lib/python2.7/dist-packages/PyQt4/QtGui.so #21 0x00007fffcd5c9572 in ?? () from /usr/lib/python2.7/dist-packages/PyQt4/Qsci.so #22 0x00007ffff2b9c8db in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #23 0x00007ffff2f4bb66 in QFrame::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #24 0x00007ffff2fcb82b in QAbstractScrollArea::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #25 0x00007fffcd15e2e0 in QsciScintilla::event(QEvent*) () from /usr/lib/libqscintilla2.so.8 #26 0x00007fffcd624d6b in ?? () from /usr/lib/python2.7/dist-packages/PyQt4/Qsci.so #27 0x00007ffff2b4ce9c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #28 0x00007ffff2b51e84 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #29 0x00007ffff4941ffe in QgsApplication::notify (this=0x7fffffffd220, receiver=0x25f1780, event=0x7fffffffbd10) at /data/src/qgis/qgis-master/src/core/qgsapplication.cpp:241 #30 0x00007ffff37a556e in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #31 0x00007ffff2bede79 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #32 0x00007ffff2bee2b1 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #33 0x00007ffff2bc9ed9 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #34 0x00007ffff2bf1fa2 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #35 0x00007fffef4b7ab5 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #36 0x00007fffef4b7de8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #37 0x00007fffef4b7ea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #38 0x00007ffff37d3bf6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #39 0x00007ffff2bf1c1e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4 #40 0x00007ffff37a42bf in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #41 0x00007ffff37a4548 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #42 0x00007ffff37a9708 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #43 0x000000000054d408 in main (argc=1, argv=0x7fffffffd4f8) at /data/src/qgis/qgis-master/src/app/main.cpp:997 (gdb)
fix_sip_QString.patch 
(899 Bytes)
Associated revisions
Fixes #8061
History
#1
Updated by Etienne Tourigny over 11 years ago
- Subject changed from python bindings for legendInterface().groupLayerRelationship() gives segfault (when no groups present) to python bindings for legendInterface().groupLayerRelationship() gives segfault
this happens if there are groups or not
#2
Updated by Salvatore Larosa over 11 years ago
- File fix_sip_QString.patch added
Mine is just improvisation.
The attached patch should fix the problem !
(but I do not know if it breaks something else :-)))
#3
Updated by Alexander Bruy over 11 years ago
Works fine here with latest master
#4
Updated by Etienne Tourigny over 11 years ago
I am using python 2.7.3-0ubuntu7 and python-sip 4.13.3-2 in Linux Mint 14 (ubuntu quental), latest master.
The patch by Salvatore works for me. I will test further to make sure it doesn't break anything.
Alexandre: does it work for you after applying the patch? Are you using another sip/python version?
iface.legendInterface().groups() [] >>> iface.legendInterface().groupLayerRelationship() [[u'', [u'lines20130614111717895']]]
#5
Updated by Salvatore Larosa over 11 years ago
- Status changed from Open to Closed
Fixed in changeset 1f10010ebf064ce31a53af2917231bd9ac41e413.