(gdb) bt #0 0x00007fffc796a4ef in _swrast_select_line () at /usr/lib64/dri/i965_dri.so #1 0x00007fffc7951f43 in _tnl_render_line_strip_verts () at /usr/lib64/dri/i965_dri.so #2 0x00007fffc7953c64 in run_render () at /usr/lib64/dri/i965_dri.so #3 0x00007fffc7940d22 in _tnl_run_pipeline () at /usr/lib64/dri/i965_dri.so #4 0x00007fffc794032c in _tnl_draw_prims () at /usr/lib64/dri/i965_dri.so #5 0x00007fffc7adfc4c in brw_draw_prims () at /usr/lib64/dri/i965_dri.so #6 0x00007fffc792559c in vbo_draw_arrays () at /usr/lib64/dri/i965_dri.so #7 0x00007fffc799b0eb in blitframebuffer_texture () at /usr/lib64/dri/i965_dri.so #8 0x00007fffc799bf1c in _mesa_meta_BlitFramebuffer () at /usr/lib64/dri/i965_dri.so #9 0x00007fffc7b9a2c5 in intel_blit_framebuffer () at /usr/lib64/dri/i965_dri.so #10 0x00007fffc7805eb2 in _mesa_BlitFramebuffer () at /usr/lib64/dri/i965_dri.so #11 0x00007fffc7b43a2f in brw_meta_updownsample () at /usr/lib64/dri/i965_dri.so #12 0x00007fffc7b9bb29 in intel_miptree_updownsample () at /usr/lib64/dri/i965_dri.so #13 0x00007fffc7b99d1e in intel_unmap_renderbuffer () at /usr/lib64/dri/i965_dri.so #14 0x00007fffc79705de in unmap_attachment () at /usr/lib64/dri/i965_dri.so #15 0x00007fffc7970d6e in _swrast_unmap_renderbuffers () at /usr/lib64/dri/i965_dri.so #16 0x00007fffc7953c94 in run_render () at /usr/lib64/dri/i965_dri.so #17 0x00007fffc7940d22 in _tnl_run_pipeline () at /usr/lib64/dri/i965_dri.so #18 0x00007fffc794032c in _tnl_draw_prims () at /usr/lib64/dri/i965_dri.so #19 0x00007fffc7929488 in vbo_rebase_prims () at /usr/lib64/dri/i965_dri.so #20 0x00007fffc7940ac3 in _tnl_draw_prims () at /usr/lib64/dri/i965_dri.so #21 0x00007fffc793ee36 in flush_vertex () at /usr/lib64/dri/i965_dri.so #22 0x00007fffc793f299 in vbo_split_inplace () at /usr/lib64/dri/i965_dri.so #23 0x00007fffc7940a7d in _tnl_draw_prims () at /usr/lib64/dri/i965_dri.so #24 0x00007fffc7adfc4c in brw_draw_prims () at /usr/lib64/dri/i965_dri.so #25 0x00007fffc792795c in vbo_exec_vtx_flush () at /usr/lib64/dri/i965_dri.so #26 0x00007fffc790b3a7 in vbo_exec_wrap_buffers () at /usr/lib64/dri/i965_dri.so #27 0x00007fffc7916c53 in vbo_exec_vtx_wrap () at /usr/lib64/dri/i965_dri.so #28 0x00007ffff701743a in opengl_renderer::draw_line(line::properties const&) (this=0x7fffffffaa90, props=...) at libinterp/corefcn/gl-render.cc:1567 #29 0x00007ffff700ec15 in opengl_renderer::draw(graphics_object const&, bool) (this=this@entry=0x7fffffffaa90, go=..., toplevel=toplevel@entry=true) at libinterp/corefcn/gl-render.cc:589 #30 0x00007ffff7b00771 in opengl_selector::draw(graphics_object const&, bool) (this=0x7fffffffaa90, go=..., toplevel=) at libgui/graphics/gl-select.cc:140 #31 0x00007ffff7015229 in opengl_renderer::draw_axes_children(axes::properties const&) (this=this@en---Type to continue, or q to quit--- try=0x7fffffffaa90, props=...) at libinterp/corefcn/gl-render.cc:1417 #32 0x00007ffff7015a84 in opengl_renderer::draw_axes(axes::properties const&) (this=0x7fffffffaa90, props=...) at libinterp/corefcn/gl-render.cc:1492 #33 0x00007ffff700ec15 in opengl_renderer::draw(graphics_object const&, bool) (this=this@entry=0x7fffffffaa90, go=..., toplevel=toplevel@entry=true) at libinterp/corefcn/gl-render.cc:589 #34 0x00007ffff7b00771 in opengl_selector::draw(graphics_object const&, bool) (this=0x7fffffffaa90, go=..., toplevel=) at libgui/graphics/gl-select.cc:140 #35 0x00007ffff7b001c1 in opengl_selector::select(graphics_object const&, int, int, int) (this=this@entry=0x7fffffffaa90, ax=..., x=268, y=202, flags=flags@entry=0) at libgui/graphics/gl-select.cc:79 #36 0x00007ffff7ad9821 in QtHandles::GLCanvas::selectFromAxes(graphics_object const&, QPoint const&) (this=0x7e4bb0, ax=..., pt=...) at libgui/graphics/GLCanvas.cc:99 #37 0x00007ffff7ac79a0 in QtHandles::Canvas::select_object(graphics_object, QMouseEvent*, graphics_object&, graphics_object&, bool) (this=this@entry=0x7e4bd8, obj=..., event=event@entry=0x7fffffffb700, currentObj=..., axesObj=..., axes_only=axes_only@entry=false) at libgui/graphics/Canvas.cc:431 #38 0x00007ffff7ac8a26 in QtHandles::Canvas::canvasMousePressEvent(QMouseEvent*) (this=0x7e4bd8, event=0x7fffffffb700) at libgui/graphics/Canvas.cc:595 #39 0x00007ffff54bcf00 in QWidget::event(QEvent*) () at /lib64/libQtGui.so.4 #40 0x00007ffff5fc4cc1 in QGLWidget::event(QEvent*) () at /lib64/libQtOpenGL.so.4 #41 0x00007ffff54683ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4 #42 0x00007ffff546f3c6 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4 #43 0x00007ffff4f3bf1d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4 #44 0x00007ffff546e9cd in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer&, bool) () at /lib64/libQtGui.so.4 #45 0x00007ffff54e6a1b in QETWidget::translateMouseEvent(_XEvent const*) () at /lib64/libQtGui.so.4 #46 0x00007ffff54e53bd in QApplication::x11ProcessEvent(_XEvent*) () at /lib64/libQtGui.so.4 #47 0x00007ffff550e489 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQtGui.so.4 #48 0x00007fffeb627a8a in g_main_context_dispatch () at /lib64/libglib-2.0.so.0 #49 0x00007fffeb627e20 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0 #50 0x00007fffeb627ecc in g_main_context_iteration () at /lib64/libglib-2.0.so.0 #51 0x00007ffff4f6c4ce in QEventDispatcherGlib::processEvents(QFlags) () at /lib64/libQtCore.so.4 #52 0x00007ffff550e626 in QGuiEventDispatcherGlib::processEvents(QFlags to continue, or q to quit--- g>) () at /lib64/libQtGui.so.4 #53 0x00007ffff4f3a791 in QEventLoop::processEvents(QFlags) () at /lib64/libQtCore.so.4 #54 0x00007ffff4f3ab05 in QEventLoop::exec(QFlags) () at /lib64/libQtCore.so.4 #55 0x00007ffff4f406a9 in QCoreApplication::exec() () at /lib64/libQtCore.so.4 #56 0x00007ffff7a47244 in octave_start_gui(int, char**, bool) (argc=10, argv=0x7fffffffc3d8, start_gui=) at libgui/src/octave-gui.cc:198 #57 0x00007fffecfdb700 in __libc_start_main () at /lib64/libc.so.6 #58 0x0000000000400c39 in _start () (gdb)