As far as I can see from backtrace, gstreamer is doing something with liboil:
Code:
#0 0x0186fb26 in oil_test_check_impl () from /usr/lib/liboil-0.3.so.0
#1 0x0186c795 in oil_class_optimize () from /usr/lib/liboil-0.3.so.0
#2 0x0186ca61 in oil_optimize_all () from /usr/lib/liboil-0.3.so.0
#3 0x0186cc46 in oil_init () from /usr/lib/liboil-0.3.so.0
#4 0x00b355f8 in plugin_init (plugin=0x80a9668) at gstvolume.c:839
#5 0x055517fb in gst_plugin_register_func (plugin=0x80a9668, desc=0xb37c80, user_data=0x0) at gstplugin.c:420
#6 0x05551f6b in gst_plugin_load_file (filename=0x80c16f8 "/usr/lib/gstreamer-0.10/libgstvolume.so", error=0xbfffef88) at gstplugin.c:641
#7 0x05552287 in gst_plugin_load_by_name (name=0x80c16c0 "volume") at gstplugin.c:1104
#8 0x05552ed6 in gst_plugin_feature_load (feature=0x80bb6c0) at gstpluginfeature.c:110
#9 0x0553c579 in gst_element_factory_create (factory=0x1, name=0x0) at gstelementfactory.c:389
#10 0x0553d46b in gst_element_factory_make (factoryname=0xb26abf "volume", name=0x0) at gstelementfactory.c:478
#11 0x00b057cd in Phonon::Gstreamer::AudioOutput::AudioOutput(Phonon::Gstreamer::Backend*, QObject*) ()
from /targets/i386-F-51-1/usr/lib/qt4/plugins/phonon_backend/libphonon_gstreamer.so
#12 0x00b0b85c in Phonon::Gstreamer::Backend::createObject(Phonon::BackendInterface::Class, QObject*, QList<QVariant> const&) ()
from /targets/i386-F-51-1/usr/lib/qt4/plugins/phonon_backend/libphonon_gstreamer.so
#13 0x00273eec in Phonon::Factory::createAudioOutput(QObject*) () from /usr/lib/libphonon.so.4
#14 0x0026b1e3 in Phonon::AudioOutputPrivate::createBackendObject() () from /usr/lib/libphonon.so.4
#15 0x002696e5 in Phonon::AudioOutputPrivate::init(Phonon::Category) () from /usr/lib/libphonon.so.4
#16 0x0026a8fd in Phonon::AudioOutput::AudioOutput(Phonon::Category, QObject*) () from /usr/lib/libphonon.so.4
#17 0x00260ef4 in Phonon::createPlayer(Phonon::Category, Phonon::MediaSource const&) () from /usr/lib/libphonon.so.4
#18 0x08048958 in main ()