Hello,
I am using Gentoo-Sabayon, KDE 4.3.4 latest releases.
I had the same problem with previous releases and previous Amarok releases.
When I have 3-4 files on the list, everything works fine, when I try to "select" and add 20 or more files to the list, Amarok crashes, has this been reported as a bug?

Here's what is generated:

Code: Select all

Application: Amarok (amarok), signal: Segmentation fault
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib64/libgobject-2.0.so.0.2200.3-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 0x7fe69a678770 (LWP 4205))]

Thread 38 (Thread 0x7fe686120910 (LWP 4206)):
#0  0x00007fe6973c324d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe68ad17121 in ?? () from /usr/lib64/libxine.so.1
#2  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#3  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 37 (Thread 0x7fe6845d3910 (LWP 4207)):
#0  0x00007fe6978e68a3 in poll () from /lib/libc.so.6
#1  0x00007fe690e35eac in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fe690e361f0 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fe698dc6ce6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#4  0x00007fe698d9c092 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#5  0x00007fe698d9c46c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#6  0x00007fe698ca87c9 in QThread::exec() () from /usr/lib64/qt4/libQtCore.so.4
#7  0x00007fe68af6fdee in ?? () from /usr/lib64/kde4/plugins/phonon_backend/phonon_xine.so
#8  0x00007fe698cab1e5 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#9  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#10 0x00007fe6978ef56d in clone () from /lib/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 36 (Thread 0x7fe683dd2910 (LWP 4208)):
#0  0x00007fe6978e68a3 in poll () from /lib/libc.so.6
#1  0x00007fe6855065df in ?? () from /usr/lib/libpulse.so.0
#2  0x00007fe6854f68e6 in pa_mainloop_poll () from /usr/lib/libpulse.so.0
#3  0x00007fe6854f7ca9 in pa_mainloop_iterate () from /usr/lib/libpulse.so.0
#4  0x00007fe6854f7d60 in pa_mainloop_run () from /usr/lib/libpulse.so.0
#5  0x00007fe6855064eb in ?? () from /usr/lib/libpulse.so.0
#6  0x00007fe6852c2538 in ?? () from /usr/lib/libpulsecommon-0.9.21.so
#7  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#8  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#9  0x0000000000000000 in ?? ()

Thread 35 (Thread 0x7fe67f5d0910 (LWP 4209)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe68ad25133 in ?? () from /usr/lib64/libxine.so.1
#2  0x00007fe68ad26b5a in ?? () from /usr/lib64/libxine.so.1
#3  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#4  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 34 (Thread 0x7fe67e9c4910 (LWP 4210)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe68ad25133 in ?? () from /usr/lib64/libxine.so.1
#2  0x00007fe68ad26b5a in ?? () from /usr/lib64/libxine.so.1
#3  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#4  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 33 (Thread 0x7fe67e1c3910 (LWP 4211)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe68ad25133 in ?? () from /usr/lib64/libxine.so.1
#2  0x00007fe68ad26b5a in ?? () from /usr/lib64/libxine.so.1
#3  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#4  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 32 (Thread 0x7fe67d9c2910 (LWP 4212)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe68ad25133 in ?? () from /usr/lib64/libxine.so.1
#2  0x00007fe68ad26b5a in ?? () from /usr/lib64/libxine.so.1
#3  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#4  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 31 (Thread 0x7fe6765ab910 (LWP 4214)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 30 (Thread 0x7fe6753b4910 (LWP 4215)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 29 (Thread 0x7fe674bb3910 (LWP 4217)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 28 (Thread 0x7fe6743b2910 (LWP 4218)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 27 (Thread 0x7fe673bb1910 (LWP 4219)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 26 (Thread 0x7fe6733b0910 (LWP 4220)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 25 (Thread 0x7fe672baf910 (LWP 4221)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 24 (Thread 0x7fe6723ae910 (LWP 4222)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 23 (Thread 0x7fe671bad910 (LWP 4223)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 22 (Thread 0x7fe6713ac910 (LWP 4224)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 21 (Thread 0x7fe670bab910 (LWP 4225)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 20 (Thread 0x7fe6703aa910 (LWP 4226)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 19 (Thread 0x7fe66fba9910 (LWP 4227)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 18 (Thread 0x7fe66f3a8910 (LWP 4228)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 17 (Thread 0x7fe66eba7910 (LWP 4229)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 16 (Thread 0x7fe66e3a6910 (LWP 4230)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 15 (Thread 0x7fe66dba5910 (LWP 4231)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 14 (Thread 0x7fe66d3a4910 (LWP 4232)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b5a732 in os_aio_simulated_handle () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe677b1ace3 in fil_aio_wait () from /usr/lib64/mysql/ib/libinnobase.so.0
#4  0x00007fe677b9d6d0 in ?? () from /usr/lib64/mysql/ib/libinnobase.so.0
#5  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#6  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 13 (Thread 0x7fe66be8c910 (LWP 4234)):
#0  0x00007fe6978e8cf2 in select () from /lib/libc.so.6
#1  0x00007fe677b56adb in os_thread_sleep () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b9b9c1 in srv_lock_timeout_and_monitor_thread () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#4  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 12 (Thread 0x7fe66b68b910 (LWP 4235)):
#0  0x00007fe6978e8cf2 in select () from /lib/libc.so.6
#1  0x00007fe677b56adb in os_thread_sleep () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b9a252 in srv_error_monitor_thread () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#4  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 11 (Thread 0x7fe66ae8a910 (LWP 4236)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe677b56685 in os_event_wait_low () from /usr/lib64/mysql/ib/libinnobase.so.0
#2  0x00007fe677b98434 in srv_master_thread () from /usr/lib64/mysql/ib/libinnobase.so.0
#3  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#4  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 10 (Thread 0x7fe664574910 (LWP 4237)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe692d834a6 in ?? () from /usr/lib64/qt4/libQtWebKit.so.4
#2  0x00007fe692d834c9 in ?? () from /usr/lib64/qt4/libQtWebKit.so.4
#3  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#4  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 9 (Thread 0x7fe662fca910 (LWP 4238)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe698cac1ab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007fe6952d78c6 in ?? () from /usr/lib64/libthreadweaver.so.4
#3  0x00007fe6952d99fb in ?? () from /usr/lib64/libthreadweaver.so.4
#4  0x00007fe6952d9a14 in ?? () from /usr/lib64/libthreadweaver.so.4
#5  0x00007fe6952d9a14 in ?? () from /usr/lib64/libthreadweaver.so.4
#6  0x00007fe6952d7fff in ?? () from /usr/lib64/libthreadweaver.so.4
#7  0x00007fe6952d8458 in ThreadWeaver::Thread::run() () from /usr/lib64/libthreadweaver.so.4
#8  0x00007fe698cab1e5 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#9  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#10 0x00007fe6978ef56d in clone () from /lib/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7fe661fc8910 (LWP 4241)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe698cac1ab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007fe6952d78c6 in ?? () from /usr/lib64/libthreadweaver.so.4
#3  0x00007fe6952d99fb in ?? () from /usr/lib64/libthreadweaver.so.4
#4  0x00007fe6952d9a14 in ?? () from /usr/lib64/libthreadweaver.so.4
#5  0x00007fe6952d7fff in ?? () from /usr/lib64/libthreadweaver.so.4
#6  0x00007fe6952d8458 in ThreadWeaver::Thread::run() () from /usr/lib64/libthreadweaver.so.4
#7  0x00007fe698cab1e5 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#8  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#9  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7fe6617c7910 (LWP 4242)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe698cac1ab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007fe6952d78c6 in ?? () from /usr/lib64/libthreadweaver.so.4
#3  0x00007fe6952d99fb in ?? () from /usr/lib64/libthreadweaver.so.4
#4  0x00007fe6952d7fff in ?? () from /usr/lib64/libthreadweaver.so.4
#5  0x00007fe6952d8458 in ThreadWeaver::Thread::run() () from /usr/lib64/libthreadweaver.so.4
#6  0x00007fe698cab1e5 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#7  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#8  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#9  0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7fe660581910 (LWP 4254)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe693fd61d6 in ?? () from /usr/lib64/qt4/libQtScript.so.4
#2  0x00007fe693fd61f9 in ?? () from /usr/lib64/qt4/libQtScript.so.4
#3  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#4  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7fe65c63f910 (LWP 4255)):
#0  0x00007fe6973c2fc9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe698cac1ab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007fe6952d78c6 in ?? () from /usr/lib64/libthreadweaver.so.4
#3  0x00007fe6952d99fb in ?? () from /usr/lib64/libthreadweaver.so.4
#4  0x00007fe6952d9a14 in ?? () from /usr/lib64/libthreadweaver.so.4
#5  0x00007fe6952d7fff in ?? () from /usr/lib64/libthreadweaver.so.4
#6  0x00007fe6952d8458 in ThreadWeaver::Thread::run() () from /usr/lib64/libthreadweaver.so.4
#7  0x00007fe698cab1e5 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#8  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#9  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7fe660fc6910 (LWP 4257)):
#0  0x00007fe6973c324d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe698cac112 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007fe698ca15a9 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#3  0x00007fe698cab1e5 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#4  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#5  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fe65b31d910 (LWP 4270)):
#0  0x00007fe6973c324d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe698cac112 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007fe698ca15a9 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#3  0x00007fe698cab1e5 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#4  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#5  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fe65ab1c910 (LWP 4271)):
#0  0x00007fe6973c324d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fe698cac112 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007fe698ca15a9 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#3  0x00007fe698cab1e5 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#4  0x00007fe6973be624 in start_thread () from /lib/libpthread.so.0
#5  0x00007fe6978ef56d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fe69a678770 (LWP 4205)):
[KCrash Handler]
#5  0x00007fe698300220 in QImageData::checkForAlphaPixels() const () from /usr/lib64/qt4/libQtGui.so.4
#6  0x00007fe69833617d in QX11PixmapData::fromImage(QImage const&, QFlags<Qt::ImageConversionFlag>) () from /usr/lib64/qt4/libQtGui.so.4
#7  0x00007fe698328fe6 in QPixmapData::fromData(unsigned char const*, unsigned int, char const*, QFlags<Qt::ImageConversionFlag>) () from /usr/lib64/qt4/libQtGui.so.4
#8  0x00007fe6983229d0 in QPixmap::loadFromData(unsigned char const*, unsigned int, char const*, QFlags<Qt::ImageConversionFlag>) () from /usr/lib64/qt4/libQtGui.so.4
#9  0x00007fe699b0497c in ?? () from /usr/lib64/libamaroklib.so.1
#10 0x00007fe699b04c29 in ?? () from /usr/lib64/libamaroklib.so.1
#11 0x00007fe698db0433 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/qt4/libQtCore.so.4
#12 0x00007fe6991a6852 in KJob::result(KJob*) () from /usr/lib64/libkdecore.so.5
#13 0x00007fe6991a6bcf in KJob::emitResult() () from /usr/lib64/libkdecore.so.5
#14 0x00007fe691c08ed3 in KIO::SimpleJob::slotFinished() () from /usr/lib64/libkio.so.5
#15 0x00007fe691c09393 in KIO::TransferJob::slotFinished() () from /usr/lib64/libkio.so.5
#16 0x00007fe691c07ca1 in KIO::TransferJob::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkio.so.5
#17 0x00007fe691c07f50 in KIO::StoredTransferJob::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkio.so.5
#18 0x00007fe698db0433 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/qt4/libQtCore.so.4
#19 0x00007fe691ccb471 in KIO::SlaveInterface::dispatch(int, QByteArray const&) () from /usr/lib64/libkio.so.5
#20 0x00007fe691cc7d23 in KIO::SlaveInterface::dispatch() () from /usr/lib64/libkio.so.5
#21 0x00007fe691cbab4d in KIO::Slave::gotInput() () from /usr/lib64/libkio.so.5
#22 0x00007fe691cbcc6c in KIO::Slave::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkio.so.5
#23 0x00007fe698db0433 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/qt4/libQtCore.so.4
#24 0x00007fe691bd6057 in ?? () from /usr/lib64/libkio.so.5
#25 0x00007fe691bd617d in KIO::Connection::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkio.so.5
#26 0x00007fe698dad389 in QObject::event(QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#27 0x00007fe69825872c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#28 0x00007fe698260fba in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#29 0x00007fe699ab2dda in App::notify(QObject*, QEvent*) () from /usr/lib64/libamaroklib.so.1
#30 0x00007fe698d9d77c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#31 0x00007fe698d9fef7 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/qt4/libQtCore.so.4
#32 0x00007fe698dc7153 in ?? () from /usr/lib64/qt4/libQtCore.so.4
#33 0x00007fe690e3270e in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0x00007fe690e360c8 in ?? () from /usr/lib/libglib-2.0.so.0
#35 0x00007fe690e361f0 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0x00007fe698dc6c93 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#37 0x00007fe6982f4f9e in ?? () from /usr/lib64/qt4/libQtGui.so.4
#38 0x00007fe698d9c092 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#39 0x00007fe698d9c46c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#40 0x00007fe698da01bb in QCoreApplication::exec() () from /usr/lib64/qt4/libQtCore.so.4
#41 0x0000000000408772 in _start ()


Unfortunately my system is not configured to generate a proper trace at the moment, I asked for some help on the Sabayon forums.

Regards,
Richard.

This is a bug in Qt 4.6, should be fixed in Qt 4.6.1 already. Ask your distribution to provide a newer Qt version.
See also https://bugs.kde.org/show_bug.cgi?id=215392

Please do not report bugs in the forum, we have a bugtracker on purpose that is able to handle this much better. See also this thread:
viewtopic.php?f=115&t=67238#p91261