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

[David Siñuela]

Hello,

Thanks for your input. We can wait for an upstream fix, in the meanwhile we
will patch it in our development branch.

I tried your proposed solution, calling DisplaySettings::instance() from
main(), and it didn't work, when s_InitRegistry is destroyed the
DisplaySettings::s_displaySettings has been destroyed already. It can be
fixed by defining a static initializer like InitRegistry that simply calls
DisplaySettings::instance() in our program. If I understood it correctly
this works because the compiler/linker will see this static member and
DisplaySettings::s_displaySettings before InitRegistry, changing the order
of initialization so that DisplaySettings::s_displaySettings is allocated
before s_InitRegistry and deallocated after.

It can also be fixed by calling "osgDB::DatabasePager::prototype()" or
"osg::DisplaySettings::instance()" from InitRegistry's constructor.

Regards,
David



On Fri, Oct 2, 2015 at 6:28 PM, Robert Osfield <robert.osfield at gmail.com>
wrote:

> 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*
>> *www.pix4d.com* <http://www.pix4d.com>
>>
>> _______________________________________________
>> osg-users mailing list
>> osg-users at lists.openscenegraph.org
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>
>>
>
> _______________________________________________
> osg-users mailing list
> osg-users at lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>


-- 
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*
*www.pix4d.com* <http://www.pix4d.com>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/attachments/20151005/cc69673c/attachment-0003.htm>