Bug report #253

crash when using the *Identify Features* tool

Added by venturato-faunalia-it - about 14 years ago. Updated about 11 years ago.

Assignee:Gary Sherman
Affected QGIS version: Regression?:No
Operating System:Debian Easy fix?:No
Pull Request or Patch supplied: Resolution:fixed
Crashes QGIS or corrupts data: Copied to github as #:10312


At the second identification of a feature (postgis layers in our case), qgis regularly segfaults. r5742


#1 Updated by Gavin Macaulay - about 14 years ago

Can you provide a gdb backtrace please.

#2 Updated by venturato-faunalia-it - about 14 years ago

I hope it could help:
(gdb) bt
#0 0xa75e5dc0 in QWidget::raise () from /usr/lib/libQtGui.so.4
#3905 0xa6b34a6a in QgsMapToolIdentify::identifyVectorLayer () from /usr/lib/libqgis_gui.so.0
#3906 0xa6b36952 in QgsMapToolIdentify::canvasReleaseEvent () from /usr/lib/libqgis_gui.so.0
#3907 0xa6b15c39 in QgsMapCanvas::contentsMouseReleaseEvent () from /usr/lib/libqgis_gui.so.0
#3908 0xa7b5dd1e in Q3ScrollView::viewportMouseReleaseEvent () from /usr/lib/libQt3Support.so.4
#3909 0xa7b5ecdf in Q3ScrollView::eventFilter () from /usr/lib/libQt3Support.so.4
#3910 0xa75ac683 in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#3911 0xa75adb0d in QApplication::notify () from /usr/lib/libQtGui.so.4
#3912 0xa76019b2 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#3913 0xa76006aa in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#10 0xa7611c43 in non-virtual thunk to QDesktopWidget::~QDesktopWidget() () from /usr/lib/libQtGui.so.4
#3914 0xa7dbd004 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#3915 0xa7dbd1da in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#3916 0xa7dc0564 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#3917 0xa75ac347 in QApplication::exec () from /usr/lib/libQtGui.so.4
#3918 0x0804c994 in main ()

#3 Updated by Gavin Macaulay - about 14 years ago

Are you able to do some more debugging to find out where in the QgsMapToolIdentify::identifyVectorLayer function the crash is happening?

A simple technique is to put the line:


throughout the src/gui/qgsmaptoolidentify.cc file, recompile (make install in the gui directory will be sufficient), run qgis, cause the crash, and see what line number it got up to, and then keep adding those lines until you've found the line of code that is causing the crash.

#4 Updated by Redmine Admin about 14 years ago

My QGIS has the same behavior only when I close the "Identify Features" window with the x Button at the UR window corner. When I close the window with the "close" button all works fine.

#5 Updated by Gavin Macaulay - about 14 years ago

  • Status changed from Open to Closed
  • Resolution set to fixed

Fixed in SVN 15bde541 (SVN r5759). All it took was that last clue...

#6 Updated by Anonymous about 11 years ago

Milestone Version 0.8 deleted

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