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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Look at the stack trace and notice that the problem is being caused by an Error being thrown, Set a break point inside the
</span>pqOutputWindow::onDisplayErrorText<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"> and when the error is thrown, see what the char* error message is. Once you identify that, you’ll be able to
fix the problem so it doesn’t happen and the sgfault should go away. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">(At some point error display got broken in paraview and instead of the error message appearing, it segfaults like this. Usually
an error on startup, I had this problem a lot, but it seems to be less frequent now).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">JB<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> paraview-developers-bounces@paraview.org [mailto:paraview-developers-bounces@paraview.org]
<b>On Behalf Of </b>Michael Schlottke<br>
<b>Sent:</b> 04 June 2013 16:00<br>
<b>To:</b> ParaView Developers<br>
<b>Subject:</b> [Paraview-developers] Segmentation fault: vtkEventQtSlotConnect (0xdea0f0): Cannot connect NULL objects<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi there,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I know this issue has been on the list before (once in Oct '12 and then again Jan '13), but it seemed like it was never fully (or at least publicly) resolved. I seem to get the exact same error as the other user got back then, after compiling
and installing ParaView-4.0.0-RC2 on a Linux machine:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">###################################################<o:p></o:p></p>
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<p class="MsoNormal">$> ./paraview<o:p></o:p></p>
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<p class="MsoNormal">ERROR: In /home/mic/.pool/.src/ParaView-4.0.0-RC2/VTK/GUISupport/Qt/vtkEventQtSlotConnect.cxx, line 68<o:p></o:p></p>
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<p class="MsoNormal">vtkEventQtSlotConnect (0xdea0f0): Cannot connect NULL objects.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Program received signal SIGSEGV, Segmentation fault.<o:p></o:p></p>
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<p class="MsoNormal">###################################################<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I used gcc-4.8.0 as well as clang-3.3 to compile ParaView, and still get the same error. Also, the same error whether I do it on a 2.6.34 or 3.1.10 kernel machine (openSUSE 11.3 and 12.1 respectively). The used Qt version is 4.8.4 (also
compiled with gcc and clang). I also tried Utkarsh's solution by removing the $HOME/.config/ParaView directory, but to no avail. Starting paraview with the '-dr' option doesn't change anything either. When I try to run a previously compiled ParaView 3.14.1
client, it works without a glitch.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I recompiled ParaView for a Debug build and used gdb to get a stack trace:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">###################################################<o:p></o:p></p>
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<p class="MsoNormal">0x00007ffff6962720 in <b>pqApplicationCore::settings (this=0xb7f360) at /home/mic/.pool/.src/ParaView-4.0.0-RC2/Qt/Core/pqApplicationCore.cxx:635</b><o:p></o:p></p>
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<p class="MsoNormal">635<span class="apple-tab-span"> </span> <b>vtkProcessModule::GetProcessModule()->GetOptions());</b><o:p></o:p></p>
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<p class="MsoNormal">(gdb) where<o:p></o:p></p>
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<p class="MsoNormal">#0 0x00007ffff6962720 in pqApplicationCore::settings (this=0xb7f360) at /home/mic/.pool/.src/ParaView-4.0.0-RC2/Qt/Core/pqApplicationCore.cxx:635<o:p></o:p></p>
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<p class="MsoNormal">#1 0x00007ffff69e55e8 in pqOutputWindow::showEvent (this=0xb6c290, e=0x7fffffffc820) at /home/mic/.pool/.src/ParaView-4.0.0-RC2/Qt/Core/pqOutputWindow.cxx:200<o:p></o:p></p>
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<p class="MsoNormal">#2 0x00007fffdc3d5027 in QWidget::event(QEvent*) () from /home/mic/.pool/qt-4.8.4_clang/lib/libQtGui.so.4<o:p></o:p></p>
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<p class="MsoNormal">#3 0x00007fffdc3899f6 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /home/mic/.pool/qt-4.8.4_clang/lib/libQtGui.so.4<o:p></o:p></p>
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<p class="MsoNormal">#4 0x00007fffdc38c70e in QApplication::notify(QObject*, QEvent*) () from /home/mic/.pool/qt-4.8.4_clang/lib/libQtGui.so.4<o:p></o:p></p>
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<p class="MsoNormal">#5 0x00007fffdbab2896 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /home/mic/.pool/qt-4.8.4_clang/lib/libQtCore.so.4<o:p></o:p></p>
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<p class="MsoNormal">#6 0x00007fffdc3d3b4c in QWidgetPrivate::show_helper() () from /home/mic/.pool/qt-4.8.4_clang/lib/libQtGui.so.4<o:p></o:p></p>
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<p class="MsoNormal">#7 0x00007fffdc3d4646 in QWidget::setVisible(bool) () from /home/mic/.pool/qt-4.8.4_clang/lib/libQtGui.so.4<o:p></o:p></p>
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<p class="MsoNormal">#8 0x00007fffdc84c9d0 in QDialog::setVisible(bool) () from /home/mic/.pool/qt-4.8.4_clang/lib/libQtGui.so.4<o:p></o:p></p>
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<p class="MsoNormal">#9 0x00007ffff696648b in QWidget::show (this=0xb6c290) at /home/mic/.pool/qt-4.8.4_clang/include/QtGui/qwidget.h:494<o:p></o:p></p>
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<p class="MsoNormal">#10 0x00007ffff69e5421 in pqOutputWindow::onDisplayErrorText (this=0xb6c290, text=...) at /home/mic/.pool/.src/ParaView-4.0.0-RC2/Qt/Core/pqOutputWindow.cxx:174<o:p></o:p></p>
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<p class="MsoNormal">#11 0x00007ffff6a72db2 in pqOutputWindow::qt_static_metacall (_o=0xb6c290, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fffffffcbc0) at /home/mic/.pool/.build/ParaView-4.0.0-RC2_debug/Qt/Core/moc_pqOutputWindow.cxx:64<o:p></o:p></p>
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<p class="MsoNormal">#12 0x00007fffdbac9a30 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /home/mic/.pool/qt-4.8.4_clang/lib/libQtCore.so.4<o:p></o:p></p>
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<p class="MsoNormal">#13 0x00007ffff6a7248f in pqOutputWindowAdapter::displayErrorText (this=0xb6c3e0, _t1=...) at /home/mic/.pool/.build/ParaView-4.0.0-RC2_debug/Qt/Core/moc_pqOutputWindowAdapter.cxx:122<o:p></o:p></p>
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<p class="MsoNormal">#14 0x00007ffff69e39ce in pqOutputWindowAdapter::DisplayErrorText (this=0xb6c3e0, text=0xc62e30 "ERROR: In /home/mic/.pool/.src/ParaView-4.0.0-RC2/VTK/GUISupport/Qt/vtkEventQtSlotConnect.cxx, line 68\nvtkEventQtSlotConnect (0xdea0f0): Cannot
connect NULL objects.\n\n")<o:p></o:p></p>
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<p class="MsoNormal"> at /home/mic/.pool/.src/ParaView-4.0.0-RC2/Qt/Core/pqOutputWindowAdapter.cxx:109<o:p></o:p></p>
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<p class="MsoNormal">#15 0x00007ffff69e3a4f in non-virtual thunk to pqOutputWindowAdapter::DisplayErrorText(char const*) (this=0xb6c3f0,<o:p></o:p></p>
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<p class="MsoNormal"> text=0xc62e30 "ERROR: In /home/mic/.pool/.src/ParaView-4.0.0-RC2/VTK/GUISupport/Qt/vtkEventQtSlotConnect.cxx, line 68\nvtkEventQtSlotConnect (0xdea0f0): Cannot connect NULL objects.\n\n")<o:p></o:p></p>
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<p class="MsoNormal"> at /home/mic/.pool/.src/ParaView-4.0.0-RC2/Qt/Core/pqOutputWindowAdapter.cxx:111<o:p></o:p></p>
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<p class="MsoNormal">#16 0x00007fffdb112acc in vtkOutputWindowDisplayErrorText (message=0xc62e30 "ERROR: In /home/mic/.pool/.src/ParaView-4.0.0-RC2/VTK/GUISupport/Qt/vtkEventQtSlotConnect.cxx, line 68\nvtkEventQtSlotConnect (0xdea0f0): Cannot connect NULL objects.\n\n")<o:p></o:p></p>
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<p class="MsoNormal"> at /home/mic/.pool/.src/ParaView-4.0.0-RC2/VTK/Common/Core/vtkOutputWindow.cxx:41<o:p></o:p></p>
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<p class="MsoNormal">#17 0x00007fffe3db6f61 in vtkEventQtSlotConnect::Connect (this=0xdea0f0, vtk_obj=0x0, event=66, qt_obj=0xf57c60, slot=0x7ffff6b04e00 "1connectionCreated(vtkObject*, unsigned long, void*, void*)", client_data=0x0, priority=0, type=Qt::AutoConnection)<o:p></o:p></p>
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<p class="MsoNormal"> at /home/mic/.pool/.src/ParaView-4.0.0-RC2/VTK/GUISupport/Qt/vtkEventQtSlotConnect.cxx:68<o:p></o:p></p>
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<p class="MsoNormal">#18 0x00007ffff6a3af74 in pqServerManagerObserver::pqServerManagerObserver (this=0xf57c60, p=0xb7f360) at /home/mic/.pool/.src/ParaView-4.0.0-RC2/Qt/Core/pqServerManagerObserver.cxx:73<o:p></o:p></p>
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<p class="MsoNormal">#19 0x00007ffff6960b6d in pqApplicationCore::constructor (this=0xb7f360) at /home/mic/.pool/.src/ParaView-4.0.0-RC2/Qt/Core/pqApplicationCore.cxx:155<o:p></o:p></p>
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<p class="MsoNormal">#20 0x00007ffff69606f8 in pqApplicationCore::pqApplicationCore (this=0xb7f360, argc=@0x7fffffffd4fc: 1, argv=0x7fffffffd6b8, options=0xb155e0, parentObject=0x0) at /home/mic/.pool/.src/ParaView-4.0.0-RC2/Qt/Core/pqApplicationCore.cxx:132<o:p></o:p></p>
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<p class="MsoNormal">#21 0x00007ffff7b505f1 in pqPVApplicationCore::pqPVApplicationCore (this=0xb7f360, argc=@0x7fffffffd4fc: 1, argv=0x7fffffffd6b8, options=0x0) at /home/mic/.pool/.src/ParaView-4.0.0-RC2/Qt/ApplicationComponents/pqPVApplicationCore.cxx:68<o:p></o:p></p>
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<p class="MsoNormal">#22 0x0000000000409c52 in pqparaviewInitializer::Initialize (this=0x7fffffffd570, argc=1, argv=0x7fffffffd6b8) at /home/mic/.pool/.build/ParaView-4.0.0-RC2_debug/Applications/ParaView/pqparaviewInitializer.cxx:78<o:p></o:p></p>
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<p class="MsoNormal">#23 0x00000000004098d1 in main (argc=1, argv=0x7fffffffd6b8) at /home/mic/.pool/.build/ParaView-4.0.0-RC2_debug/Applications/ParaView/paraview_main.cxx:76<o:p></o:p></p>
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<p class="MsoNormal">###################################################<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Is there any new knowledge on what this might be related to or how I can fix this?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Regards,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Michael<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">--<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">Michael Schlottke<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">SimLab Highly Scalable Fluids & Solids Engineering<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">Jülich Aachen Research Alliance (JARA-HPC)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">RWTH Aachen University<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">Wüllnerstraße 5a<br>
52062 Aachen<br>
Germany<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">Phone: +49 (241) 80 95188<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">Fax: +49 (241) 80 92257<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">Mail:
<a href="mailto:m.schlottke@aia.rwth-aachen.de">m.schlottke@aia.rwth-aachen.de</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black">Web: <a href="http://www.jara.org/jara-hpc">http://www.jara.org/jara-hpc</a><o:p></o:p></span></p>
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