[osg-users] How to debug this SIGSEGV

Tue May 26 08:25:12 PDT 2020

Mauricio, could you please provide some guidance (maybe a small example) of 
how to ensure that the opengl context is current every time I 
update/render? Thank you so much.

On Tuesday, May 26, 2020 at 9:02:51 AM UTC-5, Erik Hensens wrote:
>
> Thank you, Mauricio! I'll consider removing or hiding nodes one at a time, 
> but because there are just so many I'm afraid it won't be practical.
>
> I don't know about the OpenGL context being current, but I will learn 
> about this. Thanks for the suggestion!
>
> On Saturday, May 23, 2020 at 1:30:34 AM UTC-5, Mauricio Franco wrote:
>>
>> remove or hide some nodes (setting nodemask to 0) from your scenegraph 
>> until you find the one causing the issue.
>>
>> Use a StateSetHandler to turn on or off rendering features.
>>
>> Make sure the opengl context is current every time you update/render the 
>> scene graph.
>>
>> Capture osg logging.
>>
>> Looks like it happens during the rendering of a VBO in a osg::Geometry.
>>
>> Sent from my iPhone
>>
>> On May 22, 2020, at 10:59 PM, Brett Gossage <bgos... at gmail.com> wrote:
>>
>> 
>> Build in debug mode.  Run it under valgrind:   valgrind  <your app>  arg1 
>> arg2 ...
>>
>> Go through the steps necessary to duplicate the error.
>>
>> You'll get a call stack output to the console with the origin of the 
>> error. (hopefully)
>>
>> Good luck.
>>
>>
>>
>>
>>
>>
>> On Fri, May 22, 2020 at 4:53 PM Erik Hensens <hen... at gmail.com> wrote:
>>
>>> Hello! I am totally at a loss and I hope someone can help me. I've got a 
>>> Gtk application running on Ubuntu that uses osgGtk to display the scene. 
>>> The crash does not happen every time I do the same operation, only 
>>> sometimes. As you can see, the crash is in libosg. I guess that I'm doing 
>>> something wrong in an Osg call somewhere and the crash is just happening 
>>> asynchronously? Either way I have absolutely no idea how to approach fixing 
>>> this crash. Please help me! Here's a typical backtrace. Does anyone have 
>>> any ideas? Thank you all so much in advance!
>>>
>>> - Erik
>>>
>>> #0  0x00007fffd2e90eea in ?? () from 
>>> /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
>>> #1  0x00007fffd2d2f5e0 in ?? () from 
>>> /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
>>> #2  0x00007fffd2e9ddb0 in ?? () from 
>>> /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
>>> #3  0x00007ffff55af488 in 
>>> osg::Geometry::drawImplementation(osg::RenderInfo&) const () from 
>>> /usr/lib/x86_64-linux-gnu/libosg.so.100
>>> #4  0x00007ffff47d1380 in osgUtil::RenderLeaf::render(osg::RenderInfo&, 
>>> osgUtil::RenderLeaf*) () from /usr/lib/x86_64-linux-gnu/libosgUtil.so.100
>>> #5  0x00007ffff47cb695 in 
>>> osgUtil::RenderBin::drawImplementation(osg::RenderInfo&, 
>>> osgUtil::RenderLeaf*&) () from /usr/lib/x86_64-linux-gnu/libosgUtil.so.100
>>> #6  0x00007ffff47cb6d4 in 
>>> osgUtil::RenderBin::drawImplementation(osg::RenderInfo&, 
>>> osgUtil::RenderLeaf*&) () from /usr/lib/x86_64-linux-gnu/libosgUtil.so.100
>>> #7  0x00007ffff47d6ed7 in 
>>> osgUtil::RenderStage::drawImplementation(osg::RenderInfo&, 
>>> osgUtil::RenderLeaf*&) () from /usr/lib/x86_64-linux-gnu/libosgUtil.so.100
>>> #8  0x00007ffff47d5cd2 in 
>>> osgUtil::RenderStage::drawInner(osg::RenderInfo&, osgUtil::RenderLeaf*&, 
>>> bool&) () from /usr/lib/x86_64-linux-gnu/libosgUtil.so.100
>>> #9  0x00007ffff47d7c7f in osgUtil::RenderStage::draw(osg::RenderInfo&, 
>>> osgUtil::RenderLeaf*&) () from /usr/lib/x86_64-linux-gnu/libosgUtil.so.100
>>> #10 0x00007ffff47dfdb7 in osgUtil::SceneView::draw() () from 
>>> /usr/lib/x86_64-linux-gnu/libosgUtil.so.100
>>> #11 0x00007ffff443545f in osgViewer::Renderer::cull_draw() () from 
>>> /usr/lib/x86_64-linux-gnu/libosgViewer.so.100
>>> #12 0x00007ffff55cfd49 in osg::GraphicsContext::runOperations() () from 
>>> /usr/lib/x86_64-linux-gnu/libosg.so.100
>>> #13 0x00007ffff446c6c4 in osgViewer::ViewerBase::renderingTraversals() 
>>> () from /usr/lib/x86_64-linux-gnu/libosgViewer.so.100
>>> #14 0x0000000000a7c73e in 
>>> osgViewer::ViewerGtk::on_graphics_window_expose_event (widget=0x31134b0, 
>>> event=0x7fffffffdf10, data=0x456ba50) at Main3D/osgGtk/ViewerGtk.cpp:220
>>> #15 0x00007ffff78beaec in ?? () from 
>>> /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
>>> #16 0x00007ffff6904fa5 in g_closure_invoke () from 
>>> /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
>>> #17 0x00007ffff6916fc1 in ?? () from 
>>> /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
>>> #18 0x00007ffff691f7f9 in g_signal_emit_valist () from 
>>> /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
>>> #19 0x00007ffff692008f in g_signal_emit () from 
>>> /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
>>> #20 0x00007ffff79d693c in ?? () from 
>>> /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
>>> #21 0x00007ffff78bd7dd in gtk_main_do_event () from 
>>> /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
>>> #22 0x00007ffff7518b9f in ?? () from 
>>> /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
>>> #23 0x00007ffff7515671 in ?? () from 
>>> /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
>>> #24 0x00007ffff7515fa8 in gdk_window_process_all_updates () from 
>>> /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
>>> #25 0x00007ffff7842971 in ?? () from 
>>> /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
>>> #26 0x00007ffff74f4d57 in ?? () from 
>>> /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
>>> #27 0x00007ffff662e04a in g_main_context_dispatch () from 
>>> /lib/x86_64-linux-gnu/libglib-2.0.so.0
>>> #28 0x00007ffff662e3f0 in ?? () from 
>>> /lib/x86_64-linux-gnu/libglib-2.0.so.0
>>> #29 0x00007ffff662e712 in g_main_loop_run () from 
>>> /lib/x86_64-linux-gnu/libglib-2.0.so.0
>>> #30 0x00007ffff78bc697 in gtk_main () from 
>>> /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
>>> #31 0x000000000130f9a6 in main (argc=1, argv=0x7fffffffe398) at 
>>> Main/main.cpp:3889
>>>
>>>
>>>
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