I would first begin by using inspection tools as valgrind or the
gcc/clang sanitizers, because this looks like a thread synchronization
problem.
"Broi, Franco" writes:
> Hi,
>
> I have an application that takes a snapshot of the scene using
> setPostDrawCallback(capture), which gets the image and
> writes it to a file but on completion setting setPostDrawCallback(NULL)
> crashes on the next expose.
>
> #4 0x7f681bf08520 in () at
> /lib/x86_64-linux-gnu/libc.so.6
> #5 0x7f681db87260 in osgUtil::RenderStage::draw(osg::RenderInfo&,
> osgUtil::RenderLeaf*&) () at /usr/local/lib/libosgUtil.so.161
> #6 0x7f681db92f2c in osgUtil::SceneView::draw() () at
> /usr/local/lib/libosgUtil.so.161
> #7 0x7f681d69b6b6 in osgViewer::Renderer::cull_draw() () at
> /usr/local/lib/libosgViewer.so.161
> #8 0x7f681edaa479 in osg::GraphicsContext::runOperations() () at
> /usr/local/lib/libosg.so.161
> #9 0x7f681d6d5bfd in osgViewer::ViewerBase::renderingTraversals() () at
> /usr/local/lib/libosgViewer.so.161
> #10 0x7f6835a03b37 in OSGGTKDrawingArea::_expose_event(_GtkGLArea*,
> _GdkGLContext*) (this=0x5575767c6450, area=0x557576c4c2e0,
> context=0x557576c50580) at osggtkdrawingarea.cpp:83
>
> Even if I do nothing in the capture callback it still crashes.
>
> I've looked through the OSG examples but nothing sets the postdraw or
> finaldraw callbacks to NULL, both produce the same
> crash.
>
> This code has remained unchanged for 10 years but wasn't being used so the
> crash only came to light recently.
>
> I'm using OSG I built from source but I also tried it with
> libopenscenegraph161/jammy on Ubuntu and it still crashes -
> but strangely doesn't render an image but that's a problem for another day.
>
> ldd ./qd3d/nyb/.libs/nyb-2108.1.1 | grep osg
> libosg.so.161 => /usr/local/lib/libosg.so.161 (0x7faab920)
> libosgDB.so.161 => /usr/local/lib/libosgDB.so.161 (0x7faab8e0)
> libosgGA.so.161 => /usr/local/lib/libosgGA.so.161 (0x7faab8a0)
> libosgText.so.161 => /usr/local/lib/libosgText.so.161
> (0x7faab860)
> libosgUtil.so.161 => /usr/local/lib/libosgUtil.so.161
> (0x7faab800)
> libosgViewer.so.161 => /usr/local/lib/libosgViewer.so.161
> (0x7faab7c0)
>
> Any ideas?
>
> Cheers,
>
--
Alberto
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