Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1243756320 (LWP 22883)]
0xb71691a0 in QString::append () from /usr/lib/libQtCore.so.4
(gdb) bt
#0  0xb71691a0 in QString::append () from /usr/lib/libQtCore.so.4
#1  0x0804df28 in QString::operator+= ()
#2  0xb6df50f0 in operator+ () from /usr/local/lib/libqgis_core.so
#3  0xb6f737db in QgsVectorLayer::draw () from /usr/local/lib/libqgis_core.so
#4  0xb6f73a84 in QgsVectorLayer::draw () from /usr/local/lib/libqgis_core.so
#5  0xb6ee01b8 in QgsMapRender::render () from /usr/local/lib/libqgis_core.so
#6  0xb6ed3594 in QgsMapCanvasMap::render ()
   from /usr/local/lib/libqgis_core.so
#7  0xb6ed0858 in QgsMapCanvas::render () from /usr/local/lib/libqgis_core.so
#8  0xb6ed096a in QgsMapCanvas::drawContents ()
   from /usr/local/lib/libqgis_core.so
#9  0xb7da0de7 in Q3ScrollView::drawContentsOffset ()
   from /usr/lib/libQt3Support.so.4
#10 0xb7da2ce2 in Q3ScrollView::viewportPaintEvent ()
   from /usr/lib/libQt3Support.so.4
#11 0xb7da2f3f in Q3ScrollView::eventFilter () from /usr/lib/libQt3Support.so.4
#12 0xb7618141 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#13 0xb761a866 in QApplication::notify () from /usr/lib/libQtGui.so.4
#14 0xb766813e in ?? () from /usr/lib/libQtGui.so.4
#15 0xb774e02c in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#16 0xb774e690 in ?? () from /usr/lib/libQtGui.so.4
#17 0xb774dbe1 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#18 0xb774e690 in ?? () from /usr/lib/libQtGui.so.4
#19 0xb774dbe1 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#20 0xb774e690 in ?? () from /usr/lib/libQtGui.so.4
#21 0xb774dbe1 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#22 0xb774e690 in ?? () from /usr/lib/libQtGui.so.4
#23 0xb774dbe1 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#24 0xb774e690 in ?? () from /usr/lib/libQtGui.so.4
#25 0xb774dbe1 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#26 0xb774e690 in ?? () from /usr/lib/libQtGui.so.4
#27 0xb774dbe1 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#28 0xb774e690 in ?? () from /usr/lib/libQtGui.so.4
#29 0xb774dbe1 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#30 0xb774eb19 in ?? () from /usr/lib/libQtGui.so.4
#31 0xb77504ca in ?? () from /usr/lib/libQtGui.so.4
#32 0xb7662768 in QWidget::event () from /usr/lib/libQtGui.so.4
#33 0xb7618190 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#34 0xb761a866 in QApplication::notify () from /usr/lib/libQtGui.so.4
#35 0xb71dd639 in QCoreApplication::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#36 0xb71ffbb0 in ?? () from /usr/lib/libQtCore.so.4
#37 0xb6139df2 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#38 0xb613cdcf in ?? () from /usr/lib/libglib-2.0.so.0
#39 0x08074e20 in ?? ()
#40 0x00000000 in ?? ()