I installed the debug symbols. The trace is below. Please tell me if, in the future, you want me to attach the traces as separate text files.

(rhythmbox:12473): Rhythmbox-WARNING **: Failed to pause pipeline before seek

(rhythmbox:12473): Rhythmbox-WARNING **: Failed to pause pipeline before seek

Program received signal SIGINT, Interrupt.
[Switching to Thread 0xb6568740 (LWP 12473)]
0xb7f5f410 in __kernel_vsyscall ()
(gdb) thread apply all bt

Thread 48 (Thread 0xaf5ffb90 (LWP 12572)):
#0  0xb7f5f410 in __kernel_vsyscall ()
#1  0xb7cd6aa5 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb1b14149 in ?? () from /usr/lib/libgstaudio-0.10.so.0
#3  0xb6fcde2f in g_thread_create_proxy (data=0x1d60)
    at /build/buildd/glib2.0-2.16.4/glib/gthread.c:635
#4  0xb7cd24fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5  0xb6e8de5e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 47 (Thread 0xb017eb90 (LWP 12571)):
#0  0xb7f5f410 in __kernel_vsyscall ()
#1  0xb7cd6aa5 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb71f95bf in gst_task_func (task=0xaf84c100, tclass=0x8c22308)
    at gsttask.c:180
#3  0xb6fcfabb in g_thread_pool_thread_proxy (data=0x8be2e00)
    at /build/buildd/glib2.0-2.16.4/glib/gthreadpool.c:265
#4  0xb6fcde2f in g_thread_create_proxy (data=0x8cee460)
    at /build/buildd/glib2.0-2.16.4/glib/gthread.c:635
#5  0xb7cd24fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb6e8de5e in clone () from /lib/tls/i686/cmov/libc.so.6
---Type <return> to continue, or q <return> to quit---

Thread 46 (Thread 0xb097fb90 (LWP 12570)):
#0  0xb7f5f410 in __kernel_vsyscall ()
#1  0xb7cd6aa5 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb71f95bf in gst_task_func (task=0xaf801280, tclass=0x8c22308)
    at gsttask.c:180
#3  0xb6fcfabb in g_thread_pool_thread_proxy (data=0x8be2e00)
    at /build/buildd/glib2.0-2.16.4/glib/gthreadpool.c:265
#4  0xb6fcde2f in g_thread_create_proxy (data=0x8ca1c58)
    at /build/buildd/glib2.0-2.16.4/glib/gthread.c:635
#5  0xb7cd24fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb6e8de5e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 45 (Thread 0xb4d40b90 (LWP 12569)):
#0  0xb7f5f410 in __kernel_vsyscall ()
#1  0xb7cd6aa5 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb71f95bf in gst_task_func (task=0xaf8cbe80, tclass=0x8c22308)
    at gsttask.c:180
#3  0xb6fcfabb in g_thread_pool_thread_proxy (data=0x8be2e00)
    at /build/buildd/glib2.0-2.16.4/glib/gthreadpool.c:265
#4  0xb6fcde2f in g_thread_create_proxy (data=0x8cec4d8)
---Type <return> to continue, or q <return> to quit---
    at /build/buildd/glib2.0-2.16.4/glib/gthread.c:635
#5  0xb7cd24fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb6e8de5e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 44 (Thread 0xb1180b90 (LWP 12568)):
#0  0xb7f5f410 in __kernel_vsyscall ()
#1  0xb7cd6aa5 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb71f95bf in gst_task_func (task=0xaf81e6e8, tclass=0x8c22308)
    at gsttask.c:180
#3  0xb6fcfabb in g_thread_pool_thread_proxy (data=0x8be2e00)
    at /build/buildd/glib2.0-2.16.4/glib/gthreadpool.c:265
#4  0xb6fcde2f in g_thread_create_proxy (data=0x8ca1ad8)
    at /build/buildd/glib2.0-2.16.4/glib/gthread.c:635
#5  0xb7cd24fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb6e8de5e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 43 (Thread 0xb1981b90 (LWP 12567)):
#0  0xb7f5f410 in __kernel_vsyscall ()
#1  0xb7cda196 in nanosleep () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6fd05e2 in IA__g_usleep (microseconds=2979533260)
    at /build/buildd/glib2.0-2.16.4/glib/gtimer.c:170
#3  0xb239b0a0 in ?? () from /usr/lib/gstreamer-0.10/libgstxvimagesink.so
---Type <return> to continue, or q <return> to quit---
#4  0xb6fcde2f in g_thread_create_proxy (data=0xb701e620)
    at /build/buildd/glib2.0-2.16.4/glib/gthread.c:635
#5  0xb7cd24fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb6e8de5e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 42 (Thread 0xb3d5cb90 (LWP 12566)):
#0  0xb7f5f410 in __kernel_vsyscall ()
#1  0xb7cd6aa5 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb71f95bf in gst_task_func (task=0xaf84ccf0, tclass=0x8c22308)
    at gsttask.c:180
#3  0xb6fcfabb in g_thread_pool_thread_proxy (data=0x8be2e00)
    at /build/buildd/glib2.0-2.16.4/glib/gthreadpool.c:265
#4  0xb6fcde2f in g_thread_create_proxy (data=0x8cd59b8)
    at /build/buildd/glib2.0-2.16.4/glib/gthread.c:635
#5  0xb7cd24fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb6e8de5e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 10 (Thread 0xb23f8b90 (LWP 12488)):
#0  0xb7f5f410 in __kernel_vsyscall ()
#1  0xb6e83c07 in poll () from /lib/tls/i686/cmov/libc.so.6
#2  0xb6fa91c6 in g_main_context_iterate (context=0x8befec8, block=1, 
    dispatch=1, self=0x8becb80)
---Type <return> to continue, or q <return> to quit---
    at /build/buildd/glib2.0-2.16.4/glib/gmain.c:2954
#3  0xb6fa9577 in IA__g_main_loop_run (loop=0x8c16240)
    at /build/buildd/glib2.0-2.16.4/glib/gmain.c:2853
#4  0xb78522e0 in ?? () from /usr/lib/libORBit-2.so.0
#5  0xb6fcde2f in g_thread_create_proxy (data=0x8becb80)
    at /build/buildd/glib2.0-2.16.4/glib/gthread.c:635
#6  0xb7cd24fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb6e8de5e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 7 (Thread 0xb33fab90 (LWP 12481)):
#0  0xb7f5f410 in __kernel_vsyscall ()
#1  0xb7cd6aa5 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6f80df2 in g_async_queue_pop_intern_unlocked (queue=0x8254230, 
    try=<value optimized out>, end_time=0x0)
    at /build/buildd/glib2.0-2.16.4/glib/gasyncqueue.c:358
#3  0xb6f81195 in IA__g_async_queue_pop (queue=0x8254230)
    at /build/buildd/glib2.0-2.16.4/glib/gasyncqueue.c:398
#4  0xb7ef403a in action_thread_main (db=0x82d7058) at rhythmdb.c:2467
#5  0xb6fcde2f in g_thread_create_proxy (data=0x8bfdde0)
    at /build/buildd/glib2.0-2.16.4/glib/gthread.c:635
#6  0xb7cd24fb in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb6e8de5e in clone () from /lib/tls/i686/cmov/libc.so.6
---Type <return> to continue, or q <return> to quit---

Thread 1 (Thread 0xb6568740 (LWP 12473)):
#0  0xb7f5f410 in __kernel_vsyscall ()
#1  0xb7cd6dd2 in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb714b077 in g_cond_timed_wait_posix_impl (cond=0x81a3418, 
    entered_mutex=0x80, abs_time=0x1f)
    at /build/buildd/glib2.0-2.16.4/gthread/gthread-posix.c:242
#3  0xb71c83e3 in gst_element_get_state_func (element=0x8bd7018, state=0x0, 
    pending=0x0, timeout=3000000000) at gstelement.c:1899
#4  0xb71af8b3 in gst_bin_get_state_func (element=0x8bd7018, state=0x0, 
    pending=0x0, timeout=3000000000) at gstbin.c:1547
#5  0xb71c43f4 in gst_element_get_state (element=0x8bd7018, state=0x0, 
    pending=0x0, timeout=3000000000) at gstelement.c:2002
#6  0xb7f0d80e in rb_player_gst_set_time (player=0x82045f8, time=457)
    at rb-player-gst.c:1123
#7  0xb7f0b5ea in rb_player_set_time (player=0x82045f8, time=457)
    at rb-player.c:410
#8  0x0806e76d in rb_shell_player_set_playing_time (player=0x82de818, 
    time=457, error=0x0) at rb-shell-player.c:2960
#9  0xb7ee00b3 in slider_release_callback (widget=0x820f130, event=0xaf81d388, 
    header=0x82df850) at rb-header.c:596
#10 0xb75bb8d4 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#11 0xb7160759 in IA__g_closure_invoke (closure=0x820f130, 
    return_value=0xbfe09df0, n_param_values=2, param_values=0xbfe09ed4, 
    invocation_hint=0xbfe09ddc)
    at /build/buildd/glib2.0-2.16.4/gobject/gclosure.c:490
#12 0xb7174f8b in signal_emit_unlocked_R (node=0x8101ec0, detail=0, 
    instance=0x820f130, emission_return=0xbfe0a094, 
    instance_and_params=0xbfe09ed4)
    at /build/buildd/glib2.0-2.16.4/gobject/gsignal.c:2440
#13 0xb7176947 in IA__g_signal_emit_valist (instance=0x820f130, signal_id=63, 
    detail=0, var_args=0xbfe0a110 "(���\210�\201�0� \b?�m�0� \bP�!\b")
    at /build/buildd/glib2.0-2.16.4/gobject/gsignal.c:2209
#14 0xb7176f69 in IA__g_signal_emit (instance=0x820f130, signal_id=63, 
    detail=0) at /build/buildd/glib2.0-2.16.4/gobject/gsignal.c:2243
#15 0xb76da667 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#16 0xb75b4b21 in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0
#17 0xb75b5d88 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#18 0xb742da9a in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#19 0xb6fa5dd6 in IA__g_main_context_dispatch (context=0x820c618)
    at /build/buildd/glib2.0-2.16.4/glib/gmain.c:2012
#20 0xb6fa9193 in g_main_context_iterate (context=0x820c618, block=1, 
    dispatch=1, self=0x80dc408)
    at /build/buildd/glib2.0-2.16.4/glib/gmain.c:2645
#21 0xb6fa9577 in IA__g_main_loop_run (loop=0x8ba0988)
---Type <return> to continue, or q <return> to quit---
    at /build/buildd/glib2.0-2.16.4/glib/gmain.c:2853
#22 0xb75b6264 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#23 0x08062a50 in main (argc=Cannot access memory at address 0x80
) at main.c:327