Application: amarok (2.3.1)
KDE Platform Version: 4.4.81 (KDE 4.4.81 (KDE 4.5 >= 20100527)) (Compiled from sources)
Qt Version: 4.7.0
Operating System: Linux 2.6.34-gentoo x86_64
Distribution (Platform): Gentoo Packages

-- Information about the crash:
- What I was doing when the application crashed:
amarok 2.3.1 was running, playback was stopped.

I installed phonon-vlc backend and set it to be the first backend after xine backend. After pressing Apply amarok crashed

-- Backtrace:
Application: Amarok (amarok), signal: Aborted
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib64/libgobject-2.0.so.0.2200.5-gdb.py", line 9, in <module>
    from gobject import register
  File "/usr/share/glib-2.0/gdb/gobject.py", line 3, in <module>
    import gdb.backtrace
ImportError: No module named backtrace
[Current thread is 1 (Thread 0x7f5db935a7a0 (LWP 27881))]

Thread 8 (Thread 0x7f5d9211c710 (LWP 27890)):
#0  0x00007f5db4afc76c in pthread_cond_wait () from /lib/libpthread.so.0
#1  0x00007f5db24b3dad in WTF::TCMalloc_PageHeap::scavengerThread() () from /usr/lib64/qt4/libQtWebKit.so.4
#2  0x00007f5db24b3eb9 in WTF::TCMalloc_PageHeap::runScavengerThread(void*) () from /usr/lib64/qt4/libQtWebKit.so.4
#3  0x00007f5db4af7b74 in start_thread () from /lib/libpthread.so.0
#4  0x00007f5db669031d in clone () from /lib/libc.so.6

Thread 7 (Thread 0x7f5d90d7f710 (LWP 27891)):
#0  0x00007f5db4afc76c in pthread_cond_wait () from /lib/libpthread.so.0
#1  0x00007f5db6ec206b in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=0x25161a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x25161a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f5db3814703 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2515e30, th=0x2516700)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f5db3816b00 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2514e30, th=0x2516700)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f5db3816b19 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2514e30, th=0x2516700)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007f5db38157db in ThreadWeaver::ThreadRunHelper::run (this=0x7f5d90d7edf0, parent=0x2515e30, th=0x2516700)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/Thread.cpp:87
#7  0x00007f5db3815c08 in ThreadWeaver::Thread::run (this=0x2516700) at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/Thread.cpp:142
#8  0x00007f5db6ec14ae in QThreadPrivate::start (arg=0x2516700) at thread/qthread_unix.cpp:266
#9  0x00007f5db4af7b74 in start_thread () from /lib/libpthread.so.0
#10 0x00007f5db669031d in clone () from /lib/libc.so.6

Thread 6 (Thread 0x7f5d9057e710 (LWP 27892)):
#0  0x00007f5db4afc76c in pthread_cond_wait () from /lib/libpthread.so.0
#1  0x00007f5db6ec206b in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=0x25161a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x25161a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f5db3814703 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2515e30, th=0x2519a10)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f5db3816b00 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2514e30, th=0x2519a10)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f5db38157db in ThreadWeaver::ThreadRunHelper::run (this=0x7f5d9057ddf0, parent=0x2515e30, th=0x2519a10)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/Thread.cpp:87
#6  0x00007f5db3815c08 in ThreadWeaver::Thread::run (this=0x2519a10) at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/Thread.cpp:142
#7  0x00007f5db6ec14ae in QThreadPrivate::start (arg=0x2519a10) at thread/qthread_unix.cpp:266
#8  0x00007f5db4af7b74 in start_thread () from /lib/libpthread.so.0
#9  0x00007f5db669031d in clone () from /lib/libc.so.6

Thread 5 (Thread 0x7f5d8bd64710 (LWP 27893)):
#0  0x00007f5db4afc76c in pthread_cond_wait () from /lib/libpthread.so.0
#1  0x00007f5db6ec206b in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=0x25161a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x25161a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f5db3814703 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2515e30, th=0x277d6b0)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f5db3816b00 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2514e30, th=0x277d6b0)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f5db3816b19 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2514e30, th=0x277d6b0)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007f5db38157db in ThreadWeaver::ThreadRunHelper::run (this=0x7f5d8bd63df0, parent=0x2515e30, th=0x277d6b0)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/Thread.cpp:87
#7  0x00007f5db3815c08 in ThreadWeaver::Thread::run (this=0x277d6b0) at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/Thread.cpp:142
#8  0x00007f5db6ec14ae in QThreadPrivate::start (arg=0x277d6b0) at thread/qthread_unix.cpp:266
#9  0x00007f5db4af7b74 in start_thread () from /lib/libpthread.so.0
#10 0x00007f5db669031d in clone () from /lib/libc.so.6

Thread 4 (Thread 0x7f5d8b3dd710 (LWP 27894)):
#0  0x00007f5db4afc76c in pthread_cond_wait () from /lib/libpthread.so.0
#1  0x00007f5db3052164 in QTWTF::TCMalloc_PageHeap::scavengerThread() () from /usr/lib64/qt4/libQtScript.so.4
#2  0x00007f5db3052199 in QTWTF::TCMalloc_PageHeap::runScavengerThread(void*) () from /usr/lib64/qt4/libQtScript.so.4
#3  0x00007f5db4af7b74 in start_thread () from /lib/libpthread.so.0
#4  0x00007f5db669031d in clone () from /lib/libc.so.6

Thread 3 (Thread 0x7f5d86c7e710 (LWP 27897)):
#0  0x00007f5db4afc76c in pthread_cond_wait () from /lib/libpthread.so.0
#1  0x00007f5db6ec206b in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=0x25161a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x25161a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f5db3814703 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2515e30, th=0x26fc970)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f5db3816b00 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2514e30, th=0x26fc970)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f5db3816b19 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2514e30, th=0x26fc970)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007f5db38157db in ThreadWeaver::ThreadRunHelper::run (this=0x7f5d86c7ddf0, parent=0x2515e30, th=0x26fc970)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/Thread.cpp:87
#7  0x00007f5db3815c08 in ThreadWeaver::Thread::run (this=0x26fc970) at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/threadweaver/Weaver/Thread.cpp:142
#8  0x00007f5db6ec14ae in QThreadPrivate::start (arg=0x26fc970) at thread/qthread_unix.cpp:266
#9  0x00007f5db4af7b74 in start_thread () from /lib/libpthread.so.0
#10 0x00007f5db669031d in clone () from /lib/libc.so.6

Thread 2 (Thread 0x7f5da1333710 (LWP 23464)):
#0  0x00007f5db4afc76c in pthread_cond_wait () from /lib/libpthread.so.0
#1  0x00007f5d988bb41a in Thread () from /usr/lib/libvlccore.so.4
#2  0x00007f5db4af7b74 in start_thread () from /lib/libpthread.so.0
#3  0x00007f5db669031d in clone () from /lib/libc.so.6

Thread 1 (Thread 0x7f5db935a7a0 (LWP 27881)):
[KCrash Handler]
#6  0x00007f5db65df565 in raise () from /lib/libc.so.6
#7  0x00007f5db65e0d70 in abort () from /lib/libc.so.6
#8  0x00007f5db6eb8674 in qt_message_output (msgType=QtFatalMsg, buf=<value optimized out>) at global/qglobal.cpp:2253
#9  0x00007f5db6eb8822 in qt_message (msgType=QtFatalMsg, msg=0x7f5db7017828 "ASSERT: \"%s\" in file %s, line %d", ap=0x7fff66d67010) at global/qglobal.cpp:2299
#10 0x00007f5db6eb89d5 in qFatal (msg=0x6ce9 <Address 0x6ce9 out of bounds>) at global/qglobal.cpp:2482
#11 0x00007f5d98d6bb66 in Phonon::VLC::Effect::Effect(Phonon::VLC::EffectManager*, int, QObject*) () from /usr/lib64/kde4/plugins/phonon_backend/phonon_vlc.so
#12 0x00007f5d98d6a3ac in Phonon::VLC::Backend::createObject(Phonon::BackendInterface::Class, QObject*, QList<QVariant> const&) () from /usr/lib64/kde4/plugins/phonon_backend/phonon_vlc.so
#13 0x00007f5db415e959 in Phonon::Factory::createEffect(int, QObject*) () from /usr/lib/libphonon.so.4
#14 0x00007f5db4156e02 in Phonon::EffectPrivate::createBackendObject() () from /usr/lib/libphonon.so.4
#15 0x00007f5db415e2b6 in Phonon::FactoryPrivate::phononBackendChanged() () from /usr/lib/libphonon.so.4
#16 0x00007f5db415e314 in Phonon::FactoryPrivate::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libphonon.so.4
#17 0x00007f5db4d337a9 in QDBusConnectionPrivate::deliverCall (this=<value optimized out>, object=<value optimized out>, msg=<value optimized out>, metaTypes=..., slotIdx=<value optimized out>)
    at qdbusintegrator.cpp:909
#18 0x00007f5db4d3de0f in QDBusCallDeliveryEvent::placeMetaCall (this=0x0, object=0x6ce9) at qdbusintegrator_p.h:103
#19 0x00007f5db6fc5589 in QObject::event (this=0x17715b0, e=0x2dfa170) at kernel/qobject.cpp:1236
#20 0x00007f5db78d822c in QApplicationPrivate::notify_helper (this=0x16bd160, receiver=0x17715b0, e=0x2dfa170) at kernel/qapplication.cpp:4341
#21 0x00007f5db78df73d in QApplication::notify (this=0x7fff66d67f60, receiver=0x17715b0, e=0x2dfa170) at kernel/qapplication.cpp:4224
#22 0x00007f5db8eeb8be in KApplication::notify (this=0x7fff66d67f60, receiver=0x17715b0, event=0x2dfa170)
    at /var/tmp/portage/kde-base/kdelibs-4.4.81/work/kdelibs-4.4.81/kdeui/kernel/kapplication.cpp:302
#23 0x00007f5db6fb285b in QCoreApplication::notifyInternal (this=0x7fff66d67f60, receiver=0x17715b0, event=0x2dfa170) at kernel/qcoreapplication.cpp:726
#24 0x00007f5db6fb66a3 in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x1553040) at kernel/qcoreapplication.h:215
#25 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x1553040) at kernel/qcoreapplication.cpp:1367
#26 0x00007f5db6fde2f3 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at kernel/qcoreapplication.h:220
#27 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:276
#28 0x00007f5daf804377 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#29 0x00007f5daf806227 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#30 0x00007f5daf80630a in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#31 0x00007f5db6fdde33 in QEventDispatcherGlib::processEvents (this=0x15526f0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#32 0x00007f5db7987fbe in QGuiEventDispatcherGlib::processEvents (this=0x6ce9, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#33 0x00007f5db6fb15c2 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#34 0x00007f5db6fb1994 in QEventLoop::exec (this=0x7fff66d67f00, flags=) at kernel/qeventloop.cpp:201
#35 0x00007f5db6fb6989 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1003
#36 0x0000000000409380 in main ()

Reported using DrKonqi