Strange crashes after ContextObserver dtor

Thu Dec 10 10:00:05 CET 2009

Hey all,

lately I've seen several crashes that I can't really make sense of.
Maybe one of you has an idea, so I'm giving it a shot here. What
happens is this:

At random points Amarok will destroy ContextObserver, which detaches
all of its subjects, and after that something goes wrong. Here's a
debug log of it happening:

amarok: BEGIN: virtual ContextObserver::~ContextObserver()
amarok: BEGIN: void ContextSubject::detach(ContextObserver*)
amarok: END__: void ContextSubject::detach(ContextObserver*) - Took 2.5e-05s
amarok: END__: virtual ContextObserver::~ContextObserver() - Took 6.9e-05s
amarok: BEGIN: virtual VideoclipEngine::~VideoclipEngine()
amarok: END__: virtual VideoclipEngine::~VideoclipEngine() - Took 3.7e-05s
amarok: BEGIN: virtual ContextObserver::~ContextObserver()
amarok: BEGIN: void ContextSubject::detach(ContextObserver*)
amarok: END__: void ContextSubject::detach(ContextObserver*) - Took 2.4e-05s
amarok: END__: virtual ContextObserver::~ContextObserver() - Took 6.8e-05s
KCrash: Application 'amarok' crashing...

Luckily I found a way to reproduce this problem. It's obscure, but
here's how you can do it:

1) Load an album in the current playlist.
2) From outside of Amarok, delete one of the files of this album.
3) Try to play the track before the bad one, skip to near the end, let
Amarok progress to the non-existing track.
4) Amarok will skip a few tracks, then stop playing.
5) Start with 3) once more. Watch Amarok crash.

Bug report about the thing:

https://bugs.kde.org/show_bug.cgi?id=192114

Here's the backtrace you get out of it:

Application: Amarok (amarok), signal: Segmentation fault
pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
	in ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
The current source language is "auto; currently asm".
[Current thread is 1 (Thread 0x7fe9986ef7a0 (LWP 4636))]

Thread 18 (Thread 0x7fe980db2910 (LWP 4637)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:220
#1  0x00007fe986a67c91 in ?? () from /usr/lib/libxine.so.1
#2  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#3  0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4  0x0000000000000000 in ?? ()

Thread 17 (Thread 0x7fe97f869910 (LWP 4638)):
#0  0x00007fe98fdac6dd in __pthread_mutex_unlock_usercnt
(mutex=0x1d08258) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x1d08258) at pthread_mutex_unlock.c:289
#2  0x00007fe98dfa935f in ?? () from /lib/libglib-2.0.so.0
#3  0x00007fe98dfa96b0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#4  0x00007fe995a161fe in QEventDispatcherGlib::processEvents
(this=0x1d6d140, flags=<value optimized out>) at
kernel/qeventdispatcher_glib.cpp:329
#5  0x00007fe9959ec532 in QEventLoop::processEvents (this=<value
optimized out>, flags=) at kernel/qeventloop.cpp:149
#6  0x00007fe9959ec904 in QEventLoop::exec (this=0x7fe97f868fb0,
flags=) at kernel/qeventloop.cpp:201
#7  0x00007fe9959046cb in QThread::exec (this=<value optimized out>)
at thread/qthread.cpp:487
#8  0x00007fe986cc256e in ?? () from
/usr/lib/qt4/plugins/phonon_backend/phonon_xine.so
#9  0x00007fe995907445 in QThreadPrivate::start (arg=0x1d6d100) at
thread/qthread_unix.cpp:188
#10 0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#11 0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 16 (Thread 0x7fe97ac56910 (LWP 4644)):
#0  0x00007fe994e62373 in *__GI___poll (fds=<value optimized out>,
nfds=<value optimized out>, timeout=333) at
../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fe97ee64cbe in ?? () from
/usr/lib/xine/plugins/1.26/xineplug_ao_out_alsa.so
#2  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#3  0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4  0x0000000000000000 in ?? ()
The current source language is "auto; currently c".

Thread 15 (Thread 0x7fe97ea51910 (LWP 4645)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe986a78983 in ?? () from /usr/lib/libxine.so.1
#2  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#3  0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4  0x0000000000000000 in ?? ()

Thread 14 (Thread 0x7fe976454910 (LWP 4646)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe986a78983 in ?? () from /usr/lib/libxine.so.1
#2  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#3  0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4  0x0000000000000000 in ?? ()
The current source language is "auto; currently asm".

Thread 13 (Thread 0x7fe978ffd910 (LWP 4648)):
#0  0x00007fe994e673c2 in select () from /lib/libc.so.6
#1  0x00007fe986a90725 in xine_usec_sleep () from /usr/lib/libxine.so.1
#2  0x00007fe986a757e9 in ?? () from /usr/lib/libxine.so.1
#3  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#4  0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 12 (Thread 0x7fe96f3c3910 (LWP 4649)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe9959084fb in QWaitConditionPrivate::wait (this=<value
optimized out>, mutex=0x33f23c0, time=18446744073709551615) at
thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x33f23c0,
time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007fe99286d326 in
ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned
(this=0x32d7020, th=0x36f9de0) at
../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007fe99286f45b in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x36f9de0) at
../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007fe99286f474 in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x36f9de0) at
../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007fe99286f474 in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x36f9de0) at
../../../threadweaver/Weaver/WorkingHardState.cpp:74
#7  0x00007fe99286f474 in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x36f9de0) at
../../../threadweaver/Weaver/WorkingHardState.cpp:74
#8  0x00007fe99286f474 in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x36f9de0) at
../../../threadweaver/Weaver/WorkingHardState.cpp:74
#9  0x00007fe99286da5f in ThreadWeaver::ThreadRunHelper::run
(this=0x7fe96f3c3000, parent=0x32d7020, th=0x36f9de0) at
../../../threadweaver/Weaver/Thread.cpp:87
#10 0x00007fe99286deb8 in ThreadWeaver::Thread::run (this=0x36f9de0)
at ../../../threadweaver/Weaver/Thread.cpp:142
#11 0x00007fe995907445 in QThreadPrivate::start (arg=0x36f9de0) at
thread/qthread_unix.cpp:188
#12 0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#13 0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#14 0x0000000000000000 in ?? ()
The current source language is "auto; currently c".

Thread 11 (Thread 0x7fe96ebc2910 (LWP 4650)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe9959084fb in QWaitConditionPrivate::wait (this=<value
optimized out>, mutex=0x33f23c0, time=18446744073709551615) at
thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x33f23c0,
time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007fe99286d326 in
ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned
(this=0x32d7020, th=0x7fe97018a490) at
../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007fe99286f45b in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x7fe97018a490) at
../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007fe99286da5f in ThreadWeaver::ThreadRunHelper::run
(this=0x7fe96ebc2000, parent=0x32d7020, th=0x7fe97018a490) at
../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007fe99286deb8 in ThreadWeaver::Thread::run
(this=0x7fe97018a490) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007fe995907445 in QThreadPrivate::start (arg=0x7fe97018a490)
at thread/qthread_unix.cpp:188
#8  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#9  0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()
The current source language is "auto; currently asm".

Thread 10 (Thread 0x7fe96e3c1910 (LWP 4653)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe9959084fb in QWaitConditionPrivate::wait (this=<value
optimized out>, mutex=0x33f23c0, time=18446744073709551615) at
thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x33f23c0,
time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007fe99286d326 in
ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned
(this=0x32d7020, th=0x3a53490) at
../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007fe99286f45b in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x3a53490) at
../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007fe99286f474 in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x3a53490) at
../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007fe99286da5f in ThreadWeaver::ThreadRunHelper::run
(this=0x7fe96e3c1000, parent=0x32d7020, th=0x3a53490) at
../../../threadweaver/Weaver/Thread.cpp:87
#7  0x00007fe99286deb8 in ThreadWeaver::Thread::run (this=0x3a53490)
at ../../../threadweaver/Weaver/Thread.cpp:142
#8  0x00007fe995907445 in QThreadPrivate::start (arg=0x3a53490) at
thread/qthread_unix.cpp:188
#9  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#10 0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 9 (Thread 0x7fe95f7b8910 (LWP 4674)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:220
#1  0x00007fe986a71a93 in ?? () from /usr/lib/libxine.so.1
#2  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#3  0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4  0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7fe95efb7910 (LWP 4675)):
[KCrash Handler]
#5  0x00007fe983cebb97 in ?? () from /usr/lib/libavcodec.so.52
#6  0x00007fe983cebfa2 in ?? () from /usr/lib/libavcodec.so.52
#7  0x00007fe983cecc05 in ?? () from /usr/lib/libavcodec.so.52
#8  0x00007fe983b9f547 in avcodec_decode_audio2 () from
/usr/lib/libavcodec.so.52
#9  0x00007fe984514089 in ?? () from
/usr/lib/xine/plugins/1.26/xineplug_decode_ff.so
#10 0x00007fe986a72bf2 in ?? () from /usr/lib/libxine.so.1
#11 0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#12 0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7fe95e7b6910 (LWP 4676)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe986a7ba0b in xine_event_wait () from /usr/lib/libxine.so.1
#2  0x00007fe986a7ba7e in ?? () from /usr/lib/libxine.so.1
#3  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#4  0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()
The current source language is "auto; currently c".

Thread 6 (Thread 0x7fe962dd5910 (LWP 5221)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe9959084fb in QWaitConditionPrivate::wait (this=<value
optimized out>, mutex=0x8589030, time=18446744073709551615) at
thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x8589030,
time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007fe996a3943e in QFileInfoGatherer::run (this=<value
optimized out>) at dialogs/qfileinfogatherer.cpp:207
#4  0x00007fe995907445 in QThreadPrivate::start (arg=0x8589020) at
thread/qthread_unix.cpp:188
#5  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#6  0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()
The current source language is "auto; currently asm".

Thread 5 (Thread 0x7fe9635d6910 (LWP 5222)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007fe9635d5cf0 in ?? ()
#2  0x00007fff7e36c782 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 4 (Thread 0x7fe9553e3910 (LWP 5223)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe9959084fb in QWaitConditionPrivate::wait (this=<value
optimized out>, mutex=0x8492df0, time=18446744073709551615) at
thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x8492df0,
time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007fe996a3943e in QFileInfoGatherer::run (this=<value
optimized out>) at dialogs/qfileinfogatherer.cpp:207
#4  0x00007fe995907445 in QThreadPrivate::start (arg=0x8492de0) at
thread/qthread_unix.cpp:188
#5  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#6  0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fe954be2910 (LWP 5224)):
#0  0x00007fe994e62373 in *__GI___poll (fds=<value optimized out>,
nfds=<value optimized out>, timeout=-1) at
../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fe98dfa936c in ?? () from /lib/libglib-2.0.so.0
#2  0x00007fe98dfa96b0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#3  0x00007fe995a161fe in QEventDispatcherGlib::processEvents
(this=0x230c8e0, flags=<value optimized out>) at
kernel/qeventdispatcher_glib.cpp:329
#4  0x00007fe9959ec532 in QEventLoop::processEvents (this=<value
optimized out>, flags=) at kernel/qeventloop.cpp:149
#5  0x00007fe9959ec904 in QEventLoop::exec (this=0x7fe954be1fc0,
flags=) at kernel/qeventloop.cpp:201
#6  0x00007fe9959046cb in QThread::exec (this=<value optimized out>)
at thread/qthread.cpp:487
#7  0x00007fe9959cfb78 in QInotifyFileSystemWatcherEngine::run
(this=0x840ef90) at io/qfilesystemwatcher_inotify.cpp:214
#8  0x00007fe995907445 in QThreadPrivate::start (arg=0x840ef90) at
thread/qthread_unix.cpp:188
#9  0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#10 0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fe94ffff910 (LWP 6229)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe9959084fb in QWaitConditionPrivate::wait (this=<value
optimized out>, mutex=0x33f23c0, time=18446744073709551615) at
thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x33f23c0,
time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007fe99286d326 in
ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned
(this=0x32d7020, th=0x84960b0) at
../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007fe99286f45b in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x84960b0) at
../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007fe99286f474 in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x84960b0) at
../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007fe99286f474 in ThreadWeaver::WorkingHardState::applyForWork
(this=0x32ea220, th=0x84960b0) at
../../../threadweaver/Weaver/WorkingHardState.cpp:74
#7  0x00007fe99286da5f in ThreadWeaver::ThreadRunHelper::run
(this=0x7fe94ffff000, parent=0x32d7020, th=0x84960b0) at
../../../threadweaver/Weaver/Thread.cpp:87
#8  0x00007fe99286deb8 in ThreadWeaver::Thread::run (this=0x84960b0)
at ../../../threadweaver/Weaver/Thread.cpp:142
#9  0x00007fe995907445 in QThreadPrivate::start (arg=0x84960b0) at
thread/qthread_unix.cpp:188
#10 0x00007fe98fda8a04 in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#11 0x00007fe994e6e7bd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()
The current source language is "auto; currently c".

Thread 1 (Thread 0x7fe9986ef7a0 (LWP 4636)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fe9959084fb in QWaitConditionPrivate::wait (this=<value
optimized out>, mutex=0x1d4d478, time=18446744073709551615) at
thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x1d4d478,
time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007fe986cc71dd in ?? () from
/usr/lib/qt4/plugins/phonon_backend/phonon_xine.so
#4  0x00007fe986cdaed6 in ?? () from
/usr/lib/qt4/plugins/phonon_backend/phonon_xine.so
#5  0x00007fe9921b50b4 in
Phonon::MediaNodePrivate::deleteBackendObject (this=0x1c5bb30) at
../3rdparty/phonon/phonon/medianode.cpp:81
#6  0x00007fe9921c3cc5 in ~FactoryPrivate (this=0x1c5b850,
__in_chrg=<value optimized out>) at
../3rdparty/phonon/phonon/factory.cpp:193
#7  0x00007fe994dc7c12 in __run_exit_handlers (status=1) at exit.c:78
#8  *__GI_exit (status=1) at exit.c:100
#9  0x00007fe9965de328 in qt_xio_errhandler () at
kernel/qapplication_x11.cpp:707
#10 0x00007fe998271838 in KApplication::xioErrhandler
(this=0x7fff7e25aa90, dpy=0x1c7ad10) at
../../kdeui/kernel/kapplication.cpp:408
#11 0x00007fe994676fae in _XIOError () from /usr/lib/libX11.so.6
#12 0x00007fe99467e9a5 in ?? () from /usr/lib/libX11.so.6
#13 0x00007fe99467f257 in _XEventsQueued () from /usr/lib/libX11.so.6
#14 0x00007fe99466801b in XEventsQueued () from /usr/lib/libX11.so.6
#15 0x00007fe99661767c in x11EventSourceCheck (s=0x1c55cd0) at
kernel/qguieventdispatcher_glib.cpp:87
#16 0x00007fe98dfa8a9a in g_main_context_check () from /lib/libglib-2.0.so.0
#17 0x00007fe98dfa9280 in ?? () from /lib/libglib-2.0.so.0
#18 0x00007fe98dfa96b0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#19 0x00007fe995a161a6 in QEventDispatcherGlib::processEvents
(this=0x1b10770, flags=<value optimized out>) at
kernel/qeventdispatcher_glib.cpp:327
#20 0x00007fe9966174be in QGuiEventDispatcherGlib::processEvents
(this=0x1db2dbc, flags=<value optimized out>) at
kernel/qguieventdispatcher_glib.cpp:202
#21 0x00007fe9959ec532 in QEventLoop::processEvents (this=<value
optimized out>, flags=) at kernel/qeventloop.cpp:149
#22 0x00007fe9959ec904 in QEventLoop::exec (this=0x7fff7e25aa30,
flags=) at kernel/qeventloop.cpp:201
#23 0x00007fe9959eeab9 in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:888
#24 0x00000000004098aa in main (argc=4, argv=0x7fff7e25c998) at
/home/mark/kde/src/amarok/src/main.cpp:235
The current source language is "auto; currently asm".

-- 
Mark Kretschmann
Amarok Developer
Fellow of the Free Software Foundation Europe
www.kde.org - amarok.kde.org - www.fsfe.org