Bug 226104 - Crash trying to listen some of the default streams
Summary: Crash trying to listen some of the default streams
Status: RESOLVED FIXED
Alias: None
Product: amarok
Classification: Applications
Component: general (show other bugs)
Version: 2.2.2
Platform: Unlisted Binaries Linux
: NOR crash
Target Milestone: ---
Assignee: Amarok Developers
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-02-10 04:51 UTC by Sergio Del Franco
Modified: 2010-02-12 09:41 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In:


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Description Sergio Del Franco 2010-02-10 04:51:33 UTC
Application that crashed: amarok
Version of the application: 2.2.2
KDE Version: 4.3.5 (KDE 4.3.5)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-19-generic x86_64
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Amarok crashed trying to listen some of the default streams, update jamendo, etc.
This occurred during high CPU usage.

 -- Backtrace:
Application: Amarok (amarok), signal: Aborted
The current source language is "auto; currently c".
[Current thread is 1 (Thread 0x7f7b204e97a0 (LWP 11527))]

Thread 13 (Thread 0x7f7b05dae910 (LWP 11528)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:220
#1  0x00007f7b0c0e5c91 in metronom_sync_loop (this=0x1eba450) at metronom.c:870
#2  0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#3  0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4  0x0000000000000000 in ?? ()

Thread 12 (Thread 0x7f7b0422e910 (LWP 11529)):
#0  0x00007f7b1d6ca3c3 in *__GI___poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=94) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f7b16c6a37c in g_main_context_poll (context=0x1ebdb70, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>)
    at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2904
#2  g_main_context_iterate (context=0x1ebdb70, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2586
#3  0x00007f7b16c6a6c0 in IA__g_main_context_iteration (context=0x1ebdb70, may_block=1) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2654
#4  0x00007f7b1dffa1fe in QEventDispatcherGlib::processEvents (this=0x1ebd560, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:329
#5  0x00007f7b1dfd0532 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#6  0x00007f7b1dfd0904 in QEventLoop::exec (this=0x7f7b0422dfb0, flags=) at kernel/qeventloop.cpp:201
#7  0x00007f7b1dee86cb in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:487
#8  0x00007f7b0c36156e in Phonon::Xine::XineThread::run (this=0x1ebd520) at ../../xine/xinethread.cpp:143
#9  0x00007f7b1deeb445 in QThreadPrivate::start (arg=0x1ebd520) at thread/qthread_unix.cpp:188
#10 0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#11 0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()
The current source language is "auto; currently asm".

Thread 11 (Thread 0x7f7b0237e910 (LWP 11534)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f7b0c0f6983 in fifo_peek_int (this_gen=<value optimized out>) at audio_out.c:348
#2  fifo_peek (this_gen=<value optimized out>) at audio_out.c:388
#3  ao_loop (this_gen=<value optimized out>) at audio_out.c:1015
#4  0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#5  0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()
The current source language is "auto; currently c".

Thread 10 (Thread 0x7f7b00c9e910 (LWP 11536)):
#0  0x00007f7b1d6cf412 in select () from /lib/libc.so.6
#1  0x00007f7b0c10e725 in xine_usec_sleep (usec=<value optimized out>) at utils.c:481
#2  0x00007f7b0c0f37e9 in video_out_loop (this_gen=<value optimized out>) at video_out.c:1246
#3  0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#4  0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()
The current source language is "auto; currently asm".

Thread 9 (Thread 0x7f7af5773910 (LWP 11537)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f7b1deec4fb in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=0x2b05fb0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x2b05fb0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f7b1b2c7326 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2b0c530, th=0x2b05770) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f7b1b2c945b in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2b05770) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f7b1b2c9474 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2b05770) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007f7b1b2c9474 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2b05770) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#7  0x00007f7b1b2c9474 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2b05770) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#8  0x00007f7b1b2c7a5f in ThreadWeaver::ThreadRunHelper::run (this=0x7f7af5773000, parent=0x2b0c530, th=0x2b05770) at ../../../threadweaver/Weaver/Thread.cpp:87
#9  0x00007f7b1b2c7eb8 in ThreadWeaver::Thread::run (this=0x2b05770) at ../../../threadweaver/Weaver/Thread.cpp:142
#10 0x00007f7b1deeb445 in QThreadPrivate::start (arg=0x2b05770) at thread/qthread_unix.cpp:188
#11 0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#12 0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()
The current source language is "auto; currently c".

Thread 8 (Thread 0x7f7af1de1910 (LWP 11538)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f7b1deec4fb in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=0x2b05fb0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x2b05fb0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f7b1b2c7326 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2b0c530, th=0x2bc0f80) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f7b1b2c945b in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2bc0f80) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f7b1b2c9474 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2bc0f80) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007f7b1b2c9474 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2bc0f80) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#7  0x00007f7b1b2c9474 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2bc0f80) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#8  0x00007f7b1b2c9474 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2bc0f80) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#9  0x00007f7b1b2c9474 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2bc0f80) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#10 0x00007f7b1b2c9474 in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2bc0f80) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#11 0x00007f7b1b2c7a5f in ThreadWeaver::ThreadRunHelper::run (this=0x7f7af1de1000, parent=0x2b0c530, th=0x2bc0f80) at ../../../threadweaver/Weaver/Thread.cpp:87
#12 0x00007f7b1b2c7eb8 in ThreadWeaver::Thread::run (this=0x2bc0f80) at ../../../threadweaver/Weaver/Thread.cpp:142
#13 0x00007f7b1deeb445 in QThreadPrivate::start (arg=0x2bc0f80) at thread/qthread_unix.cpp:188
#14 0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#15 0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#16 0x0000000000000000 in ?? ()
The current source language is "auto; currently asm".

Thread 7 (Thread 0x7f7af0ddf910 (LWP 11541)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f7b1deec4fb in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=0x2b05fb0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x2b05fb0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f7b1b2c7326 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2b0c530, th=0x2526eb0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f7b1b2c945b in ThreadWeaver::WorkingHardState::applyForWork (this=0x2b0c880, th=0x2526eb0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f7b1b2c7a5f in ThreadWeaver::ThreadRunHelper::run (this=0x7f7af0ddf000, parent=0x2b0c530, th=0x2526eb0) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f7b1b2c7eb8 in ThreadWeaver::Thread::run (this=0x2526eb0) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f7b1deeb445 in QThreadPrivate::start (arg=0x2526eb0) at thread/qthread_unix.cpp:188
#8  0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#9  0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f7af05de910 (LWP 11542)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f7b1deec4fb in QWaitConditionPrivate::wait (this=<value optimized out>, mutex=0xf026768, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0xf026768, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f7b01167b59 in XmlParseJob::run (this=0xf026720) at /build/buildd/amarok-2.2.2/src/collection/sqlcollection/ScanManager.cpp:671
#4  0x00007f7b1b2c875d in ThreadWeaver::JobRunHelper::runTheJob (this=0x7f7af05ddf70, th=0x2571d20, job=0xf026720) at ../../../threadweaver/Weaver/Job.cpp:106
#5  0x00007f7b1b2c8a5e in ThreadWeaver::Job::execute (this=0xf026720, th=0x2571d20) at ../../../threadweaver/Weaver/Job.cpp:135
#6  0x00007f7b1b2c7a2f in ThreadWeaver::ThreadRunHelper::run (this=0x7f7af05de000, parent=0x2b0c530, th=0x2571d20) at ../../../threadweaver/Weaver/Thread.cpp:95
#7  0x00007f7b1b2c7eb8 in ThreadWeaver::Thread::run (this=0x2571d20) at ../../../threadweaver/Weaver/Thread.cpp:142
#8  0x00007f7b1deeb445 in QThreadPrivate::start (arg=0x2571d20) at thread/qthread_unix.cpp:188
#9  0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#10 0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f7acbfff910 (LWP 15434)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f7b0c0f6983 in fifo_peek_int (this_gen=<value optimized out>) at audio_out.c:348
#2  fifo_peek (this_gen=<value optimized out>) at audio_out.c:388
#3  ao_loop (this_gen=<value optimized out>) at audio_out.c:1015
#4  0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#5  0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f7ae838b910 (LWP 15447)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f7b0c0e954b in fifo_buffer_get (fifo=0x7f7afc666120) at buffer.c:230
#2  0x00007f7b0c0ef51d in video_decoder_loop (stream_gen=<value optimized out>) at video_decoder.c:130
#3  0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#4  0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f7ae7b67910 (LWP 15448)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f7b0c0e954b in fifo_buffer_get (fifo=0x7f7afc6b0460) at buffer.c:230
#2  0x00007f7b0c0f0555 in audio_decoder_loop (stream_gen=<value optimized out>) at audio_decoder.c:66
#3  0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#4  0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f7ae1275910 (LWP 15449)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f7b0c0f9a0b in xine_event_wait (queue=0x7f7afc6eae60) at events.c:56
#2  0x00007f7b0c0f9a7e in listener_loop (queue_gen=<value optimized out>) at events.c:214
#3  0x00007f7b1857ba04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#4  0x00007f7b1d6d680d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f7b204e97a0 (LWP 11527)):
[KCrash Handler]
#5  0x00007f7b1d62a4b5 in *__GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#6  0x00007f7b1d62df50 in *__GI_abort () at abort.c:92
#7  0x00007f7b0519409f in pa_threaded_mainloop_start () from /usr/lib/libpulse.so.0
#8  0x00007f7b053abe90 in open_plugin (class_gen=0x1e3eaf0, data=<value optimized out>) at audio_pulse_out.c:793
#9  0x00007f7b0c0ee130 in _load_audio_driver (this=0x1e41110, id=0x1e38408 "pulseaudio", data=<value optimized out>) at load_plugins.c:1740
#10 xine_open_audio_driver (this=0x1e41110, id=0x1e38408 "pulseaudio", data=<value optimized out>) at load_plugins.c:1808
#11 0x00007f7b0c3773d7 in Phonon::Xine::AudioOutput::createPort (this=<value optimized out>, deviceDesc=<value optimized out>) at ../../xine/audiooutput.cpp:156
#12 0x00007f7b0c37786b in Phonon::Xine::AudioOutput::setOutputDevice (this=0x2d07, newDevice=...) at ../../xine/audiooutput.cpp:263
#13 0x00007f7b1ae2c313 in callSetOutputDevice (this=0x1dd1810) at ../3rdparty/phonon/phonon/audiooutput.cpp:58
#14 Phonon::AudioOutputPrivate::_k_audioDeviceFailed (this=0x1dd1810) at ../3rdparty/phonon/phonon/audiooutput.cpp:313
#15 0x00007f7b1ae2c8c9 in Phonon::AudioOutput::qt_metacall (this=0x1dd17e0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff491b2df0)
    at .moc/release-shared/moc_audiooutput.cpp:115
#16 0x00007f7b1dfe6ddc in QMetaObject::activate (sender=0x1e37780, from_signal_index=<value optimized out>, to_signal_index=<value optimized out>, argv=0xffffffffffffffff) at kernel/qobject.cpp:3113
#17 0x00007f7b0c374721 in Phonon::Xine::AudioOutput::qt_metacall (this=0x1e37780, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0xff55f30) at ./audiooutput.moc:77
#18 0x00007f7b1dfe10f9 in QObject::event (this=0x1e37780, e=0xacdbf20) at kernel/qobject.cpp:1111
#19 0x00007f7b1e8f5efc in QApplicationPrivate::notify_helper (this=0x1c6fb30, receiver=0x1e37780, e=0xacdbf20) at kernel/qapplication.cpp:4056
#20 0x00007f7b1e8fd1ce in QApplication::notify (this=0x7fff491b3810, receiver=0x1e37780, e=0xacdbf20) at kernel/qapplication.cpp:4021
#21 0x00007f7b1f8798ea in App::notify (this=0x2d07, receiver=0x2d07, event=0x6) at /build/buildd/amarok-2.2.2/src/App.cpp:856
#22 0x00007f7b1dfd1c2c in QCoreApplication::notifyInternal (this=0x7fff491b3810, receiver=0x1e37780, event=0xacdbf20) at kernel/qcoreapplication.cpp:610
#23 0x00007f7b1dfd280a in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x1b3a800) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#24 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x1b3a800) at kernel/qcoreapplication.cpp:1247
#25 0x00007f7b1dffa533 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#26 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:210
#27 0x00007f7b16c66bce in g_main_dispatch (context=0x1c72d20) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:1960
#28 IA__g_main_context_dispatch (context=0x1c72d20) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2513
#29 0x00007f7b16c6a598 in g_main_context_iterate (context=0x1c72d20, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>)
    at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2591
#30 0x00007f7b16c6a6c0 in IA__g_main_context_iteration (context=0x1c72d20, may_block=1) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2654
#31 0x00007f7b1dffa1a6 in QEventDispatcherGlib::processEvents (this=0x1b3a460, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#32 0x00007f7b1e98a4be in QGuiEventDispatcherGlib::processEvents (this=0x2d07, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#33 0x00007f7b1dfd0532 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#34 0x00007f7b1dfd0904 in QEventLoop::exec (this=0x7fff491b37a0, flags=) at kernel/qeventloop.cpp:201
#35 0x00007f7b1dfd2ab9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#36 0x000000000040a254 in main (argc=<value optimized out>, argv=<value optimized out>) at /build/buildd/amarok-2.2.2/src/main.cpp:235
The current source language is "auto; currently c".

Reported using DrKonqi
Comment 1 Myriam Schweingruber 2010-02-10 10:17:20 UTC
Please disable Pulseaudio in your sound settings, Phonon doesn't work well with Pulseaudio in your version.
If you are running Kubuntu without Gnome, I strongly suggest you remove Pulseaudio, since KDE doesn't need it anyway. This should be solved in the new KDE SC 4.4
Comment 2 Sergio Del Franco 2010-02-12 05:02:09 UTC
In every case, PulseAudio was the second preferred device. Maybe preferred device was locked (Flash?) and Amarok used the second one?
Comment 3 Sergio Del Franco 2010-02-12 05:05:53 UTC
# aptitude why pulseaudio
i   libpulse0 Sugiere pulseaudio
# aptitude why libpulse0
i   kdebase-runtime Depende libpulse0 (>= 0.9.19)

Should I report a bug in Ubuntu's kdebase-runtime package?
Comment 4 Sergio Del Franco 2010-02-12 05:07:59 UTC
When it says: "Sugiere"
you should read: "Suggest"

When it says: "Depende"
you should read: "Depends on"
Comment 5 Myriam Schweingruber 2010-02-12 09:41:44 UTC
(In reply to comment #3)
> # aptitude why pulseaudio
> i   libpulse0 Sugiere pulseaudio
> # aptitude why libpulse0
> i   kdebase-runtime Depende libpulse0 (>= 0.9.19)
> 
> Should I report a bug in Ubuntu's kdebase-runtime package?

Not at all, since KDE is not using Pulseaudio at all in Kubuntu. You need to select your soundcard directly and use the xine backend.