[osg-users] osgDB::DynamicLibrary::getLibraryHandle - Crash due to calling dlopen with RTLD_GLOBAL

Robert Osfield robert.osfield at gmail.com
Mon Sep 21 04:11:04 PDT 2015 

Hi Gareth,

Does the crash occur for applications using osgEarth/OSG without Qt?

It's a bit hacky but would be worth trying to just scope out the issue
further : try loading all the OSG plugins that might be required prior to
starting Qt.

Robert.


On 21 September 2015 at 11:38, Gareth Francis <gfrancis.dev at gmail.com>
wrote:

> CentOS 6.5
> OSG 3.4.0
> osgEarth 2.7
>
>
> You might be right, I've just got the same crash using RTLD_LOCAL..
> I've been having several problems relating to osgQt/X11 threading, so it's
> possible that this is another symptom of that.
>
> I can't reproduce this under a debugger, however I have been able to get a
> core dump/backtrace:
>
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  0x000000371e479bb7 in _int_malloc () from /lib64/libc.so.6
> (gdb) bt
> #0  0x000000371e479bb7 in _int_malloc () from /lib64/libc.so.6
> #1  0x000000371e47b7da in _int_realloc () from /lib64/libc.so.6
> #2  0x000000371e47baf5 in realloc () from /lib64/libc.so.6
> #3  0x0000003c9e4a92ab in ?? () from /usr/lib64/libGL.so.1
> #4  0x0000003c9e4aabd1 in ?? () from /usr/lib64/libGL.so.1
> #5  0x0000003c9e4b148d in ?? () from /usr/lib64/libGL.so.1
> #6  0x0000003c9e4aa345 in ?? () from /usr/lib64/libGL.so.1
> #7  0x000000371e012bc3 in dl_open_worker () from
> /lib64/ld-linux-x86-64.so.2
> #8  0x000000371e00e266 in _dl_catch_error () from
> /lib64/ld-linux-x86-64.so.2
> #9  0x000000371e0125aa in _dl_open () from /lib64/ld-linux-x86-64.so.2
> #10 0x000000371f000f66 in dlopen_doit () from /lib64/libdl.so.2
> #11 0x000000371e00e266 in _dl_catch_error () from
> /lib64/ld-linux-x86-64.so.2
> #12 0x000000371f00129c in _dlerror_run () from /lib64/libdl.so.2
> #13 0x000000371f000ee1 in dlopen@@GLIBC_2.2.5 () from /lib64/libdl.so.2
> #14 0x00007f48a4c87603 in
> osgDB::DynamicLibrary::getLibraryHandle(std::string const&) () from
> /projects/osg/release/lib64/libosgDB.so.130
> #15 0x00007f48a4c87ba0 in osgDB::DynamicLibrary::loadLibrary(std::string
> const&) () from /projects/osg/release/lib64/libosgDB.so.130
> #16 0x00007f48a4cb5137 in osgDB::Registry::loadLibrary(std::string const&)
> () from /projects/osg/release/lib64/libosgDB.so.130
> #17 0x00007f48a4cba9c6 in
> osgDB::Registry::read(osgDB::Registry::ReadFunctor const&) () from
> /projects/osg/release/lib64/libosgDB.so.130
> #18 0x00007f48a4cbb631 in
> osgDB::Registry::readImplementation(osgDB::Registry::ReadFunctor const&,
> osgDB::Options::CacheHintOptions) ()
>    from /projects/osg/release/lib64/libosgDB.so.130
> #19 0x00007f48a4cbbd5a in
> osgDB::Registry::readObjectImplementation(std::string const&,
> osgDB::Options const*) () from /projects/osg/release/lib64/libosgDB.so.130
> #20 0x00007f48a4cac4e8 in osgDB::readRefObjectFile(std::string const&,
> osgDB::Options const*) () from /projects/osg/release/lib64/libosgDB.so.130
> #21 0x00007f48a58576a1 in osgText::readRefFontFile(std::string const&,
> osgDB::Options const*) () from /projects/osg/release/lib64/libosgText.so.130
> #22 0x00007f48a586ae4a in osgText::TextBase::setFont(std::string const&)
> () from /projects/osg/release/lib64/libosgText.so.130
> #23 0x00007f48a7de6397 in
> osgViewer::StatsHandler::setUpScene(osgViewer::ViewerBase*) () from
> /projects/osg/release/lib64/libosgViewer.so.130
> #24 0x00007f48a7deda3f in
> osgViewer::StatsHandler::handle(osgGA::GUIEventAdapter const&,
> osgGA::GUIActionAdapter&) () from
> /projects/osg/release/lib64/libosgViewer.so.130
> #25 0x00007f48a82f0192 in osgGA::GUIEventHandler::handle(osgGA::Event*,
> osg::Object*, osg::NodeVisitor*) () from
> /projects/osg/release/lib64/libosgGA.so.130
> #26 0x00007f48a7e0af93 in osgViewer::Viewer::eventTraversal() () from
> /projects/osg/release/lib64/libosgViewer.so.130
> #27 0x00007f48a7e12979 in osgViewer::ViewerBase::frame(double) () from
> /projects/osg/release/lib64/libosgViewer.so.130
> #28 0x00007f48a61e7e6e in QWidget::event(QEvent*) () from
> /projects/osg/release/lib64/libQtGui.so.4
> #29 0x00007f48a6ca0d8c in QGLWidget::event(QEvent*) () from
> /projects/osg/release/lib64/libQtOpenGL.so.4
> #30 0x00007f48a619949c in QApplicationPrivate::notify_helper(QObject*,
> QEvent*) () from /projects/osg/release/lib64/libQtGui.so.4
> #31 0x00007f48a619f981 in QApplication::notify(QObject*, QEvent*) () from
> /projects/osg/release/lib64/libQtGui.so.4
> #32 0x00007f48a5c4122c in QCoreApplication::notifyInternal(QObject*,
> QEvent*) () from /projects/osg/release/lib64/libQtCore.so.4
> #33 0x00007f48a61ea88c in QWidgetPrivate::drawWidget(QPaintDevice*,
> QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
>    from /projects/osg/release/lib64/libQtGui.so.4
> #34 0x00007f48a63b2b1c in QWidgetPrivate::repaint_sys(QRegion const&) ()
> from /projects/osg/release/lib64/libQtGui.so.4
> #35 0x00007f48a61ddf64 in QWidgetPrivate::syncBackingStore() () from
> /projects/osg/release/lib64/libQtGui.so.4
> #36 0x00007f48a61e83fc in QWidget::event(QEvent*) () from
> /projects/osg/release/lib64/libQtGui.so.4
> #37 0x00007f48a6ca0d8c in QGLWidget::event(QEvent*) () from
> /projects/osg/release/lib64/libQtOpenGL.so.4
> #38 0x00007f48a619949c in QApplicationPrivate::notify_helper(QObject*,
> QEvent*) () from /projects/osg/release/lib64/libQtGui.so.4
> #39 0x00007f48a619f981 in QApplication::notify(QObject*, QEvent*) () from
> /projects/osg/release/lib64/libQtGui.so.4
> #40 0x00007f48a5c4122c in QCoreApplication::notifyInternal(QObject*,
> QEvent*) () from /projects/osg/release/lib64/libQtCore.so.4
> #41 0x00007f48a5c4530b in
> QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) ()
> from /projects/osg/release/lib64/libQtCore.so.4
> #42 0x00007f48a623d471 in ?? () from
> /projects/osg/release/lib64/libQtGui.so.4
> #43 0x00007f48a5c3ff12 in
> QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from
> /projects/osg/release/lib64/libQtCore.so.4
> #44 0x00007f48a5c40274 in
> QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
> /projects/osg/release/lib64/libQtCore.so.4
> #45 0x00007f48a5c456cb in QCoreApplication::exec() () from
> /projects/osg/release/lib64/libQtCore.so.4
> #46 0x0000000000412f5f in main (argc=1, argv=0x7ffec6063ec8) at main.cpp:96
>
>
>
> On 21 September 2015 at 11:26, Robert Osfield <robert.osfield at gmail.com>
> wrote:
>
>> Hi Gareth,
>>
>> I don't recall this being an issue before.  What hardware, OS and
>> OSG/osgEarth versions are you using?
>>
>> Robert.
>>
>> On 21 September 2015 at 11:15, Gareth Francis <gfrancis.dev at gmail.com>
>> wrote:
>>
>>>
>>> I believe I found a bug in getLibraryHandle.
>>>
>>> This was encountered when writing an osgEarth application, using the
>>> osgEarthQt widgets (Qt 4.8.6).
>>>
>>> A segfault was encountered shortly after starting the application, when
>>> pressing 's' (To bring up the standard set of rendering stats).
>>>
>>> I traced this to the dlopen( localLibraryName.c_str(), RTLD_LAZY |
>>> RTLD_GLOBAL) call in osg/src/osgDB/DynamicLibrary.cpp
>>>
>>> According to the dlopen manpage:
>>>
>>> As at glibc 2.21, specifying the *RTLD_GLOBAL *flag when calling
>>>        *dlmopen*() generates an error.  Furthermore, specifying *RTLD_GLOBAL*
>>>        when calling *dlopen*() results in a program crash (*SIGSEGV*) if the
>>>        call is made from any object loaded in a namespace other than the
>>>        initial namespace.
>>>
>>>
>>> Changing osg to use RTLD_LOCAL avoids the crash, and doesn't seem to
>>> break anything else as far as I can tell.
>>>
>>> Is there a specific reason why RTLD_GLOBAL is used? This doesn't make
>>> much sense given the plugin architecture..
>>>
>>>
>>> I've attached a minimal patch including the fix.
>>>
>>>
>>> Thanks
>>> Gareth Francis
>>>
>>> _______________________________________________
>>> osg-users mailing list
>>> osg-users at lists.openscenegraph.org
>>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>>
>>>
>>
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>>
>>
>
>
> --
> --------------------
> Gareth Francis
> www.gfrancisdev.co.uk
>
> _______________________________________________
> osg-users mailing list
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> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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>
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