(gdb) bt
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b57e1b5ce in cc_condvar_wait () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#2  0x00007f9b57e1af2b in cc_rwmutex_write_lock () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#3  0x00007f9b57d8a440 in SoVertexShape::generateAndReadLockNormalCache(SoState*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#4  0x00007f9b57d5221c in SoIndexedShape::getVertexData(SoState*, SoCoordinateElement const*&, SbVec3f const*&, int const*&, int const*&, int const*&, int const*&, int&, int, int&) ()
   from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#5  0x00007f9b57d4b1b4 in SoIndexedLineSet::GLRender(SoGLRenderAction*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#6  0x00007f9b57d1cb41 in SoSeparator::GLRenderBelowPath(SoGLRenderAction*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#7  0x00007f9b57d1cb41 in SoSeparator::GLRenderBelowPath(SoGLRenderAction*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#8  0x00007f9b57d0a203 in SoNode::GLRenderS(SoAction*, SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#9  0x00007f9b57ad0c04 in SoAction::traverse(SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#10 0x00007f9b57c20294 in SoChildList::traverse(SoAction*, int, int) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#11 0x00007f9b57d21750 in SoSwitch::doAction(SoAction*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#12 0x00007f9b57d1cb41 in SoSeparator::GLRenderBelowPath(SoGLRenderAction*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#13 0x00007f9b57d00cfd in SoGroup::GLRender(SoGLRenderAction*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#14 0x00007f9b57d0a203 in SoNode::GLRenderS(SoAction*, SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#15 0x00007f9b57ad0c04 in SoAction::traverse(SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#16 0x00007f9b57c20294 in SoChildList::traverse(SoAction*, int, int) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#17 0x00007f9b57d21750 in SoSwitch::doAction(SoAction*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#18 0x00007f9b57d1cb41 in SoSeparator::GLRenderBelowPath(SoGLRenderAction*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#19 0x00007f9b57d1cb41 in SoSeparator::GLRenderBelowPath(SoGLRenderAction*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#20 0x00007f9b5b70e995 in Gui::SoFCUnifiedSelection::GLRenderBelowPath (this=0x2aaf7f0, action=0x2f48ba0)
    at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/SoFCUnifiedSelection.cpp:531
#21 0x00007f9b57d1cb41 in SoSeparator::GLRenderBelowPath(SoGLRenderAction*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#22 0x00007f9b57d0a203 in SoNode::GLRenderS(SoAction*, SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#23 0x00007f9b57ad0c04 in SoAction::traverse(SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#24 0x00007f9b57ad88b3 in SoGLRenderAction::beginTraversal(SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#25 0x00007f9b57ad7bf3 in SoGLRenderActionP::renderSingle(SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#26 0x00007f9b57ad8238 in SoGLRenderActionP::render(SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#27 0x00007f9b57ad8957 in SoGLRenderAction::beginTraversal(SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#28 0x00007f9b57ad17d2 in SoAction::apply(SoNode*) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#29 0x00007f9b5b716bdd in Gui::SoBoxSelectionRenderAction::apply (this=0x2f48ba0, node=0x2d2feb0) at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/SoFCSelectionAction.cpp:1010
#30 0x00007f9b57cca174 in SoRenderManager::renderScene(SoGLRenderAction*, SoNode*, unsigned int) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#31 0x00007f9b57ccb16f in SoRenderManager::actuallyRender(SoGLRenderAction*, int, int, int) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#32 0x00007f9b57ccb302 in SoRenderManager::renderSingle(SoGLRenderAction*, int, int, int) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#33 0x00007f9b57ccb9d1 in SoRenderManager::render(SoGLRenderAction*, int, int, int) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#34 0x00007f9b57cc9a0c in SoRenderManager::render(int, int) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#35 0x00007f9b5b77ec1b in SIM::Coin3D::Quarter::QuarterWidget::actualRedraw (this=0x1c5afc0) at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/Quarter/QuarterWidget.cpp:797
#36 0x00007f9b5b7aaed5 in Gui::View3DInventorViewer::renderScene (this=0x1c5afc0) at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/View3DInventorViewer.cpp:1441
#37 0x00007f9b5b7aa78e in Gui::View3DInventorViewer::actualRedraw (this=0x1c5afc0) at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/View3DInventorViewer.cpp:1324
#38 0x00007f9b5b77e9f0 in SIM::Coin3D::Quarter::QuarterWidget::paintEvent (this=0x1c5afc0, event=0x7fff0035b8d0)
---Type <return> to continue, or q <return> to quit---c
    at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/Quarter/QuarterWidget.cpp:728
#39 0x00007f9b595acce8 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#40 0x00007f9b599569fe in QFrame::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#41 0x00007f9b59b64441 in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#42 0x00007f9b5b77eadd in SIM::Coin3D::Quarter::QuarterWidget::viewportEvent (this=0x1c5afc0, event=0x7fff0035b8d0)
    at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/Quarter/QuarterWidget.cpp:752
#43 0x00007f9b58de89d6 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#44 0x00007f9b5955d0fc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#45 0x00007f9b59563870 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#46 0x00007f9b5b50e018 in Gui::GUIApplication::notify (this=0x7fff0035cd60, receiver=0x1b98100, event=0x7fff0035b8d0)
    at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/Application.cpp:1559
#47 0x00007f9b58de886d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#48 0x00007f9b595a77ad in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#49 0x00007f9b5976d24f in QWidgetPrivate::repaint_sys(QRegion const&) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#50 0x00007f9b5959ca17 in QWidgetPrivate::syncBackingStore() () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#51 0x00007f9b595acf00 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#52 0x00007f9b575b8af1 in QGLWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtOpenGL.so.4
#53 0x00007f9b5955d11c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#54 0x00007f9b59563870 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#55 0x00007f9b5b50e018 in Gui::GUIApplication::notify (this=0x7fff0035cd60, receiver=0x1b98100, event=0x7fff0035bfa0)
    at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/Application.cpp:1559
#56 0x00007f9b58de886d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#57 0x00007f9b59770824 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#58 0x00007f9b5959d0a5 in QWidget::repaint(QRect const&) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#59 0x00007f9b5959d0e3 in QWidget::repaint() () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#60 0x00007f9b5b77ebc8 in SIM::Coin3D::Quarter::QuarterWidget::redraw (this=0x1c5afc0) at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/Quarter/QuarterWidget.cpp:787
#61 0x00007f9b5b7737d2 in SIM::Coin3D::Quarter::QuarterWidgetP::rendercb (userdata=0x1c5afc0) at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/Quarter/QuarterWidgetP.cpp:186
#62 0x00007f9b57d9a1a6 in SoSensorManager::processDelayQueue(int) () from /usr/lib/x86_64-linux-gnu/libCoin.so.80
#63 0x00007f9b5b776cc1 in SIM::Coin3D::Quarter::SensorManager::idleTimeout (this=0x1293f00) at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/Quarter/SensorManager.cpp:150
#64 0x00007f9b5b781a7e in SIM::Coin3D::Quarter::SensorManager::qt_static_metacall (_o=0x1293f00, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fff0035c220)
    at /home/tanderson/Programming/freeCad/free-cad-git-build/src/Gui/Quarter/moc_SensorManager.cxx:55
#65 0x00007f9b58dfca7a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#66 0x00007f9b58e00e0b in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#67 0x00007f9b5955d11c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#68 0x00007f9b59563870 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#69 0x00007f9b5b50e018 in Gui::GUIApplication::notify (this=0x7fff0035cd60, receiver=0x1294410, event=0x7fff0035c730)
    at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/Application.cpp:1559
#70 0x00007f9b58de886d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#71 0x00007f9b58e184eb in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#72 0x00007f9b58e15711 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#73 0x00007f9b521e1c5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---c
#74 0x00007f9b521e1f48 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#75 0x00007f9b521e1ffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#76 0x00007f9b58e16031 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#77 0x00007f9b596004e6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#78 0x00007f9b58de74f1 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#79 0x00007f9b58de7805 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#80 0x00007f9b58decf67 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#81 0x00007f9b5b509692 in Gui::Application::runApplication () at /home/tanderson/Programming/freeCad/free-cad-git/src/Gui/Application.cpp:1833
#82 0x000000000040bee7 in main (argc=1, argv=0x7fff0035d6f8) at /home/tanderson/Programming/freeCad/free-cad-git/src/Main/MainGui.cpp:328