(gdb) bt
#0  0xb7fe1424 in __kernel_vsyscall ()
#1  0xb7e668e0 in raise () from /lib/i686/cmov/libc.so.6
#2  0xb7e69e15 in abort () from /lib/i686/cmov/libc.so.6
#3  0xb7be9bae in IA__g_logv (log_domain=0xb7c97a5c "GLib-GObject", log_level=G_LOG_LEVEL_WARNING, 
    format=0xb7c9cb14 "invalid (NULL) pointer instance", 
    args1=0xb73e442c "\230\006&#695;\200\264\373\267\230\006&#695;\330D>\267\322j&#567;") at /tmp/buildd/glib2.0-2.22.3/glib/gmessages.c:549
#4  0xb7be9bd6 in IA__g_log (log_domain=0xb7c97a5c "GLib-GObject", log_level=G_LOG_LEVEL_WARNING, 
    format=0xb7c9cb14 "invalid (NULL) pointer instance") at /tmp/buildd/glib2.0-2.22.3/glib/gmessages.c:569
#5  0xb7c880f8 in IA__g_type_check_instance (type_instance=0x0) at /tmp/buildd/glib2.0-2.22.3/gobject/gtype.c:3816
#6  0xb7c86ad2 in IA__g_signal_connect_data (instance=0x0, detailed_signal=0xb75f363a "notify::mute", 
    c_handler=0xb75dd3c0 <notify_mute_cb>, data=0x850f018, destroy_data=0, connect_flags=0)
    at /tmp/buildd/glib2.0-2.22.3/gobject/gsignal.c:2238
#7  0xb75dc54d in gen_audio_chain (playsink=0x850f018, raw=<value optimized out>, queue=0) at gstplaysink.c:1614
#8  0xb75de669 in gst_play_sink_reconfigure (playsink=0x850f018) at gstplaysink.c:2135
#9  0xb75d5159 in no_more_pads_cb (decodebin=0x8518018, group=0x850a22c) at gstplaybin2.c:2296
#10 0xb7c7d91c in IA__g_cclosure_marshal_VOID__VOID (closure=0x8506c30, return_value=0x0, n_param_values=1, 
    param_values=0x854e508, invocation_hint=0xb73e47e0, marshal_data=0xb75d4c60)
    at /tmp/buildd/glib2.0-2.22.3/gobject/gmarshal.c:77
#11 0xb7c6ff62 in IA__g_closure_invoke (closure=0x8506c30, return_value=0x0, n_param_values=1, param_values=0x854e508, 
    invocation_hint=0xb73e47e0) at /tmp/buildd/glib2.0-2.22.3/gobject/gclosure.c:767
#12 0xb7c843a8 in signal_emit_unlocked_R (node=<value optimized out>, detail=<value optimized out>, instance=0x8518018, 
    emission_return=0x0, instance_and_params=0x854e508) at /tmp/buildd/glib2.0-2.22.3/gobject/gsignal.c:3247
#13 0xb7c8572d in IA__g_signal_emit_valist (instance=0x8518018, signal_id=13, detail=0, 
    var_args=0xb73e499c "\204\022W\267\204\022W\267\030\200Q\b\370I>\267i\213V\267\030\200Q\b\032\371V\267")
    at /tmp/buildd/glib2.0-2.22.3/gobject/gsignal.c:2980
#14 0xb7c85ba6 in IA__g_signal_emit (instance=0x8518018, signal_id=13, detail=0)
    at /tmp/buildd/glib2.0-2.22.3/gobject/gsignal.c:3037
#15 0xb76a543a in gst_element_no_more_pads (element=0x8518018) at gstelement.c:923
#16 0xb7568b69 in no_more_pads_full (element=<value optimized out>, subs=<value optimized out>, decoder=0x8518018)
    at gsturidecodebin.c:679
#17 0xb7c7d91c in IA__g_cclosure_marshal_VOID__VOID (closure=0x85209f8, return_value=0x0, n_param_values=1, 
    param_values=0x854e4c0, invocation_hint=0xb73e4b50, marshal_data=0xb7568c30)
    at /tmp/buildd/glib2.0-2.22.3/gobject/gmarshal.c:77
#18 0xb7c6ff62 in IA__g_closure_invoke (closure=0x85209f8, return_value=0x0, n_param_values=1, param_values=0x854e4c0, 
    invocation_hint=0xb73e4b50) at /tmp/buildd/glib2.0-2.22.3/gobject/gclosure.c:767
#19 0xb7c843a8 in signal_emit_unlocked_R (node=<value optimized out>, detail=<value optimized out>, instance=0x851d060, 
    emission_return=0x0, instance_and_params=0x854e4c0) at /tmp/buildd/glib2.0-2.22.3/gobject/gsignal.c:3247
#20 0xb7c8572d in IA__g_signal_emit_valist (instance=0x851d060, signal_id=13, detail=0, 
    var_args=0xb73e4d0c "\204\022W\267\204\022W\267`\320Q\b\230M>\267\021\001V\267`\320Q\b\300\254(\b")
    at /tmp/buildd/glib2.0-2.22.3/gobject/gsignal.c:2980
#21 0xb7c85ba6 in IA__g_signal_emit (instance=0x851d060, signal_id=13, detail=0)
    at /tmp/buildd/glib2.0-2.22.3/gobject/gsignal.c:3037
#22 0xb76a543a in gst_element_no_more_pads (element=0x851d060) at gstelement.c:923
#23 0xb7560111 in gst_decode_group_expose (group=<value optimized out>) at gstdecodebin2.c:2246
#24 0xb75609bc in source_pad_blocked_cb (dpad=0x85448f8, blocked=1, unused=0x0) at gstdecodebin2.c:2509
#25 0xb76b9f41 in handle_pad_block (pad=0x85448f8) at gstpad.c:3852
#26 0xb76c6077 in gst_pad_push_event (pad=0x85448f8, event=0x853dca0) at gstpad.c:4795
#27 0xb76ae52d in gst_proxy_pad_do_event (pad=0x85219f8, event=0x853dca0) at gstghostpad.c:128
#28 0xb76c578e in gst_pad_send_event (pad=0x85219f8, event=0x853dca0) at gstpad.c:4962
#29 0xb76c5f6b in gst_pad_push_event (pad=0x85144b0, event=0x853dca0) at gstpad.c:4818
#30 0xb74748ce in gst_flac_dec_write (decoder=0x8549ff0, frame=0x854b758, buffer=0x854b344, client_data=0x854a0a0)
    at gstflacdec.c:906
#31 gst_flac_dec_write_stream (decoder=0x8549ff0, frame=0x854b758, buffer=0x854b344, client_data=0x854a0a0) at gstflacdec.c:1051
#32 0xb74272a5 in ?? () from /usr/lib/libFLAC.so.8
#33 0xb7427908 in FLAC__stream_decoder_process_single () from /usr/lib/libFLAC.so.8
#34 0xb7473c6a in gst_flac_dec_loop (sinkpad=0x85143e8) at gstflacdec.c:1083
#35 0xb76e4215 in gst_task_func (task=0x854d070) at gsttask.c:234
#36 0xb76e5b27 in default_func (tdata=0x850ebd8, pool=0x81f9410) at gsttaskpool.c:70
#37 0xb7c0b11f in g_thread_pool_thread_proxy (data=0x81f9180) at /tmp/buildd/glib2.0-2.22.3/glib/gthreadpool.c:265
#38 0xb7c09aef in g_thread_create_proxy (data=0x8549bd8) at /tmp/buildd/glib2.0-2.22.3/glib/gthread.c:635
#39 0xb7fb8585 in start_thread () from /lib/i686/cmov/libpthread.so.0
#40 0xb7f0b26e in clone () from /lib/i686/cmov/libc.so.6
