Application that crashed: amarok
Version of the application: 2.2.0
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.30.9-96.fc11.x86_64 x86_64
Distribution: "Fedora release 11 (Leonidas)"

What I was doing when the application crashed:
In Amarok...
Settings->Configure Amarok->Playback->Configure->Backend

I was changing the backend selection in Amarok from xine to GStreamer. When I clicked on GStreamer, the app crashed.

 -- Backtrace:
Application: Amarok (amarok), signal: Aborted
[Current thread is 1 (Thread 0x7f09ca782860 (LWP 2428))]

Thread 11 (Thread 0x7f09b4d79910 (LWP 2486)):
#0  0x00000038b700b2f9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000038bd05adab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQtCore.so.4
#2  0x0000003335c0aaf6 in ?? () from /usr/lib64/libthreadweaver.so.4
#3  0x0000003335c0cbfb in ?? () from /usr/lib64/libthreadweaver.so.4
#4  0x0000003335c0cc14 in ?? () from /usr/lib64/libthreadweaver.so.4
#5  0x0000003335c0b21f in ?? () from /usr/lib64/libthreadweaver.so.4
#6  0x0000003335c0b658 in ThreadWeaver::Thread::run() () from /usr/lib64/libthreadweaver.so.4
#7  0x00000038bd059cf5 in ?? () from /usr/lib64/libQtCore.so.4
#8  0x00000038b700686a in start_thread () from /lib64/libpthread.so.0
#9  0x00000038b64de3bd in clone () from /lib64/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 10 (Thread 0x7f09a3774910 (LWP 2490)):
#0  0x00000038b700b2f9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000038bd05adab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQtCore.so.4
#2  0x0000003335c0aaf6 in ?? () from /usr/lib64/libthreadweaver.so.4
#3  0x0000003335c0cbfb in ?? () from /usr/lib64/libthreadweaver.so.4
#4  0x0000003335c0b21f in ?? () from /usr/lib64/libthreadweaver.so.4
#5  0x0000003335c0b658 in ThreadWeaver::Thread::run() () from /usr/lib64/libthreadweaver.so.4
#6  0x00000038bd059cf5 in ?? () from /usr/lib64/libQtCore.so.4
#7  0x00000038b700686a in start_thread () from /lib64/libpthread.so.0
#8  0x00000038b64de3bd in clone () from /lib64/libc.so.6
#9  0x0000000000000000 in ?? ()

Thread 9 (Thread 0x7f099bfff910 (LWP 2491)):
#0  0x00000038b700b2f9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000038bd05adab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQtCore.so.4
#2  0x0000003335c0aaf6 in ?? () from /usr/lib64/libthreadweaver.so.4
#3  0x0000003335c0cbfb in ?? () from /usr/lib64/libthreadweaver.so.4
#4  0x0000003335c0cc14 in ?? () from /usr/lib64/libthreadweaver.so.4
#5  0x0000003335c0cc14 in ?? () from /usr/lib64/libthreadweaver.so.4
#6  0x0000003335c0cc14 in ?? () from /usr/lib64/libthreadweaver.so.4
#7  0x0000003335c0b21f in ?? () from /usr/lib64/libthreadweaver.so.4
#8  0x0000003335c0b658 in ThreadWeaver::Thread::run() () from /usr/lib64/libthreadweaver.so.4
#9  0x00000038bd059cf5 in ?? () from /usr/lib64/libQtCore.so.4
#10 0x00000038b700686a in start_thread () from /lib64/libpthread.so.0
#11 0x00000038b64de3bd in clone () from /lib64/libc.so.6
#12 0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7f099b5fe910 (LWP 2492)):
#0  0x00000038b700b2f9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000038bd05adab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQtCore.so.4
#2  0x0000003335c0aaf6 in ?? () from /usr/lib64/libthreadweaver.so.4
#3  0x0000003335c0cbfb in ?? () from /usr/lib64/libthreadweaver.so.4
#4  0x0000003335c0b21f in ?? () from /usr/lib64/libthreadweaver.so.4
#5  0x0000003335c0b658 in ThreadWeaver::Thread::run() () from /usr/lib64/libthreadweaver.so.4
#6  0x00000038bd059cf5 in ?? () from /usr/lib64/libQtCore.so.4
#7  0x00000038b700686a in start_thread () from /lib64/libpthread.so.0
#8  0x00000038b64de3bd in clone () from /lib64/libc.so.6
#9  0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7f0993fff910 (LWP 2888)):
#0  0x00000038b700b2f9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000038bd05adab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQtCore.so.4
#2  0x0000003f0dc3fd7e in ?? () from /usr/lib64/libQtGui.so.4
#3  0x00000038bd059cf5 in ?? () from /usr/lib64/libQtCore.so.4
#4  0x00000038b700686a in start_thread () from /lib64/libpthread.so.0
#5  0x00000038b64de3bd in clone () from /lib64/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f09935fe910 (LWP 2889)):
#0  0x00000038b700a42d in pthread_mutex_unlock () from /lib64/libpthread.so.0
#1  0x00000038b803a8fe in g_main_context_prepare () from /lib64/libglib-2.0.so.0
#2  0x00000038b803ace1 in ?? () from /lib64/libglib-2.0.so.0
#3  0x00000038b803b20a in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#4  0x00000038bd166f8e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#5  0x00000038bd13d4b2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#6  0x00000038bd13d884 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#7  0x00000038bd056f3b in QThread::exec() () from /usr/lib64/libQtCore.so.4
#8  0x00000038bd120b98 in ?? () from /usr/lib64/libQtCore.so.4
#9  0x00000038bd059cf5 in ?? () from /usr/lib64/libQtCore.so.4
#10 0x00000038b700686a in start_thread () from /lib64/libpthread.so.0
#11 0x00000038b64de3bd in clone () from /lib64/libc.so.6
#12 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f09b7df9910 (LWP 2910)):
#0  0x00000038b700b57d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000031c08135c1 in ?? () from /usr/lib64/libxine.so.1
#2  0x00000038b700686a in start_thread () from /lib64/libpthread.so.0
#3  0x00000038b64de3bd in clone () from /lib64/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f0992bfd910 (LWP 2911)):
#0  0x00000038b700a42d in pthread_mutex_unlock () from /lib64/libpthread.so.0
#1  0x00000038b80395ff in g_main_context_acquire () from /lib64/libglib-2.0.so.0
#2  0x00000038b803ac62 in ?? () from /lib64/libglib-2.0.so.0
#3  0x00000038b803b20a in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#4  0x00000038bd166f8e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#5  0x00000038bd13d4b2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#6  0x00000038bd13d884 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#7  0x00000038bd056f3b in QThread::exec() () from /usr/lib64/libQtCore.so.4
#8  0x00007f09afdb1b3e in Phonon::MediaSource::type() const () from /usr/lib64/kde4/plugins/phonon_backend/phonon_xine.so
#9  0x00000038bd059cf5 in ?? () from /usr/lib64/libQtCore.so.4
#10 0x00000038b700686a in start_thread () from /lib64/libpthread.so.0
#11 0x00000038b64de3bd in clone () from /lib64/libc.so.6
#12 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f097f5fe910 (LWP 2912)):
#0  0x00000038b700b2f9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000031c0824493 in ?? () from /usr/lib64/libxine.so.1
#2  0x00000038b700686a in start_thread () from /lib64/libpthread.so.0
#3  0x00000038b64de3bd in clone () from /lib64/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f09afb9c910 (LWP 2913)):
#0  0x00000038b64d7102 in select () from /lib64/libc.so.6
#1  0x00000031c083ba85 in xine_usec_sleep () from /usr/lib64/libxine.so.1
#2  0x00000031c0821289 in ?? () from /usr/lib64/libxine.so.1
#3  0x00000038b700686a in start_thread () from /lib64/libpthread.so.0
#4  0x00000038b64de3bd in clone () from /lib64/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f09ca782860 (LWP 2428)):
[KCrash Handler]
#5  0x00000038b64332f5 in raise () from /lib64/libc.so.6
#6  0x00000038b6434b20 in abort () from /lib64/libc.so.6
#7  0x00000038bd052164 in qt_message_output(QtMsgType, char const*) () from /usr/lib64/libQtCore.so.4
#8  0x00000038bd0522b6 in qFatal(char const*, ...) () from /usr/lib64/libQtCore.so.4
#9  0x00007f09afdccbdb in Phonon::MediaSource::type() const () from /usr/lib64/kde4/plugins/phonon_backend/phonon_xine.so
#10 0x00007f09afdcd44b in Phonon::MediaSource::type() const () from /usr/lib64/kde4/plugins/phonon_backend/phonon_xine.so
#11 0x00000038bd14e141 in QObject::event(QEvent*) () from /usr/lib64/libQtCore.so.4
#12 0x0000003f0d78f63c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#13 0x0000003f0d79689e in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#14 0x00000033304117f6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#15 0x00000038bd13ebac in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#16 0x00000038bd13f782 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/libQtCore.so.4
#17 0x00000038bd1672c3 in ?? () from /usr/lib64/libQtCore.so.4
#18 0x00000038b803790e in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#19 0x00000038b803b0e8 in ?? () from /lib64/libglib-2.0.so.0
#20 0x00000038b803b20a in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#21 0x00000038bd166f36 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#22 0x0000003f0d82202e in ?? () from /usr/lib64/libQtGui.so.4
#23 0x00000038bd13d4b2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#24 0x00000038bd13d884 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#25 0x0000003f0dc04a9e in QDialog::exec() () from /usr/lib64/libQtGui.so.4
#26 0x00000033397d35e2 in ?? () from /usr/lib64/libamaroklib.so.1
#27 0x00000033397d3cd4 in ?? () from /usr/lib64/libamaroklib.so.1
#28 0x00000038bd153dcc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQtCore.so.4
#29 0x0000003f0dd8afa7 in QAbstractButton::clicked(bool) () from /usr/lib64/libQtGui.so.4
#30 0x0000003f0daeed2b in ?? () from /usr/lib64/libQtGui.so.4
#31 0x0000003f0daf092b in ?? () from /usr/lib64/libQtGui.so.4
#32 0x0000003f0daf0b85 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib64/libQtGui.so.4
#33 0x0000003f0d7ddda8 in QWidget::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#34 0x0000003f0d78f63c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#35 0x0000003f0d7966e1 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#36 0x00000033304117f6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#37 0x00000038bd13ebac in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#38 0x0000003f0d795fd0 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&) () from /usr/lib64/libQtGui.so.4
#39 0x0000003f0d7fba7e in ?? () from /usr/lib64/libQtGui.so.4
#40 0x0000003f0d7fab38 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/libQtGui.so.4
#41 0x0000003f0d82287c in ?? () from /usr/lib64/libQtGui.so.4
#42 0x00000038b803790e in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#43 0x00000038b803b0e8 in ?? () from /lib64/libglib-2.0.so.0
#44 0x00000038b803b20a in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#45 0x00000038bd166f36 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#46 0x0000003f0d82202e in ?? () from /usr/lib64/libQtGui.so.4
#47 0x00000038bd13d4b2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#48 0x00000038bd13d884 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#49 0x00000038bd13fa19 in QCoreApplication::exec() () from /usr/lib64/libQtCore.so.4
#50 0x0000000000409d26 in _start ()

Reported using DrKonqi