[osg-users] Crash when application closes if linking with OSG

[Robert Osfield]

Hi David,

Curious bug.  Perhaps another solution would be to call
DisplaySettings::instance() at the start of main.

An actual bug fix might be to put in a proxy object into
src/osg/DisplauySettings.cpp that forces that DisplaySettings::instance()
to be constructed during static initialization, this would obviously
require a patch to the core OSG, something I'm happy to do, but won't help
you right away.

Robert.



On 2 October 2015 at 17:07, David Siñuela <david.sinuela at pix4d.com> wrote:

> Hello,
>
> We have a Qt application that uses OSG for the 3D viewer/editor, but the
> OSG viewer may not be used if the user does not open the 3D view tab. We
> are in the process of upgrading to OSG 3.4 and we noticed that the
> application crashes when the user quits if the 3D view is never open.
>
> The problem seems to be the order in which the static variables are
> destroyed at shutdown. The stacktrace looks like this:
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0000000001d8a0b0 in
> osg::DisplaySettings::getNumOfHttpDatabaseThreadsHint (this=0x0) at
> /home/siu/src/pix4dmapper/2.1/external_tmp/build/openscenegraph/include/osg/DisplaySettings:203
> (gdb) bt
> #0  0x0000000001d8a0b0 in
> osg::DisplaySettings::getNumOfHttpDatabaseThreadsHint (this=0x0) at
> /home/siu/src/pix4dmapper/2.1/external_tmp/build/openscenegraph/include/osg/DisplaySettings:203
> #1  0x0000000001d86b47 in osgDB::DatabasePager::DatabasePager
> (this=0x3a10fb0) at
> /home/siu/src/pix4dmapper/2.1/external_tmp/build/openscenegraph/src/osgDB/DatabasePager.cpp:1111
> #2  0x0000000001d87815 in osgDB::DatabasePager::prototype () at
> /home/siu/src/pix4dmapper/2.1/external_tmp/build/openscenegraph/src/osgDB/DatabasePager.cpp:1235
> #3  0x0000000001d1ceef in InitRegistry::~InitRegistry (this=0x32cc6f3
> <s_InitRegistry>, __in_chrg=<optimized out>) at
> /home/siu/src/pix4dmapper/2.1/external_tmp/build/openscenegraph/src/osgViewer/ViewerBase.cpp:53
> #4  0x00007fffec82df88 in __run_exit_handlers () from /usr/lib/libc.so.6
> #5  0x00007fffec82dfd5 in exit () from /usr/lib/libc.so.6
> #6  0x00007fffec818617 in __libc_start_main () from /usr/lib/libc.so.6
> #7  0x0000000000ea3709 in _start ()
>
> As shown in the trace calling DatabasePager::prototype() is creating the
> static DatabasePager for the first time and this one calls
> osg::DisplaySettings::instance() which was released already. It is easily
> reproducible on linux with gcc. Removing the
> osgDB::DatabasePager::prototype() = 0; line fixes the crash but I am not
> sure about the intent of that line.
>
> Regards,
>
> --
> David Sinuela Pastor
>
>
> *Pix4D SA*
> *EPFL Innovation Park*
> *Building D*
> *1015 Lausanne - Switzerland*
> *Email: <david.sinuela at pix4d.com>david.sinuela at pix4d.com
> <david.sinuela at gmail.com>*
> *Skype: david.sinuela.pix4d*
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>
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