(gdb) bt
#0  __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00007fb71f8a6664 in _L_lock_952 () from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007fb71f8a64c6 in __GI___pthread_mutex_lock (mutex=0x7fb714171fd0) at ../nptl/pthread_mutex_lock.c:114
#3  0x00007fb71fe4a9bb in g_rec_mutex_lock (mutex=<optimized out>) at gthread-posix.c:389
#4  0x00007fb719fb42a7 in gst_adaptive_demux_src_event (pad=0x140b4b0, parent=0x7fb7141720c0, event=0x7fb6e0005080) at gstadaptivedemux.c:1579
#5  0x00007fb7203ba742 in gst_pad_send_event_unchecked (pad=pad@entry=0x140b4b0, event=event@entry=0x7fb6e0005080, type=<optimized out>, type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5609
#6  0x00007fb7203baa3b in gst_pad_push_event_unchecked (pad=pad@entry=0x7fb714180030, event=event@entry=0x7fb6e0005080, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5265
#7  0x00007fb7203c517e in gst_pad_push_event (pad=0x7fb714180030, event=0x7fb6e0005080) at gstpad.c:5402
#8  0x00007fb7203ba742 in gst_pad_send_event_unchecked (pad=pad@entry=0x7fb714180270, event=event@entry=0x7fb6e0005080, type=<optimized out>, type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5609
#9  0x00007fb7203baa3b in gst_pad_push_event_unchecked (pad=pad@entry=0x7fb7141804b0, event=event@entry=0x7fb6e0005080, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5265
#10 0x00007fb7203c517e in gst_pad_push_event (pad=pad@entry=0x7fb7141804b0, event=0x7fb6e0005080) at gstpad.c:5402
#11 0x00007fb7203c53df in event_forward_func (pad=pad@entry=0x7fb7141804b0, data=data@entry=0x7fff226fc070) at gstpad.c:2994
#12 0x00007fb7203c0bd7 in gst_pad_forward (pad=pad@entry=0x7fb6fc007b40, forward=forward@entry=0x7fb7203c5310 <event_forward_func>, user_data=user_data@entry=0x7fff226fc070) at gstpad.c:2948
#13 0x00007fb7203c0d0e in gst_pad_event_default (pad=pad@entry=0x7fb6fc007b40, parent=parent@entry=0x7fb71418bbd0, event=event@entry=0x7fb6e0005080) at gstpad.c:3045
#14 0x00007fb719356f86 in gst_qtdemux_handle_src_event (pad=0x7fb6fc007b40, parent=0x7fb71418bbd0, event=0x7fb6e0005080) at qtdemux.c:1733
#15 0x00007fb7203ba742 in gst_pad_send_event_unchecked (pad=pad@entry=0x7fb6fc007b40, event=event@entry=0x7fb6e0005080, type=<optimized out>, type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5609
#16 0x00007fb7203baa3b in gst_pad_push_event_unchecked (pad=pad@entry=0x7fb6fc007d80, event=event@entry=0x7fb6e0005080, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5265
#17 0x00007fb7203c517e in gst_pad_push_event (pad=0x7fb6fc007d80, event=0x7fb6e0005080) at gstpad.c:5402
#18 0x00007fb7203ba742 in gst_pad_send_event_unchecked (pad=pad@entry=0x7fb704008030, event=event@entry=0x7fb6e0005080, type=<optimized out>, type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5609
#19 0x00007fb7203baa3b in gst_pad_push_event_unchecked (pad=pad@entry=0x7fb704008270, event=event@entry=0x7fb6e0005080, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5265
#20 0x00007fb7203c517e in gst_pad_push_event (pad=pad@entry=0x7fb704008270, event=0x7fb6e0005080) at gstpad.c:5402
#21 0x00007fb7203c53df in event_forward_func (pad=pad@entry=0x7fb704008270, data=data@entry=0x7fff226fc6e0) at gstpad.c:2994
#22 0x00007fb7203c0bd7 in gst_pad_forward (pad=0x7fb7040096b0, forward=forward@entry=0x7fb7203c5310 <event_forward_func>, user_data=user_data@entry=0x7fff226fc6e0) at gstpad.c:2948
#23 0x00007fb7203c0d0e in gst_pad_event_default (pad=<optimized out>, parent=parent@entry=0x7fb70400be40, event=event@entry=0x7fb6e0005080) at gstpad.c:3045
#24 0x00007fb71f28e292 in gst_base_parse_src_event_default (parse=0x7fb70400be40, event=0x7fb6e0005080) at gstbaseparse.c:1671
#25 0x00007fb7203ba742 in gst_pad_send_event_unchecked (pad=pad@entry=0x7fb7040096b0, event=event@entry=0x7fb6e0005080, type=<optimized out>, type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5609
#26 0x00007fb7203baa3b in gst_pad_push_event_unchecked (pad=pad@entry=0x7fb7040098f0, event=event@entry=0x7fb6e0005080, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5265
#27 0x00007fb7203c517e in gst_pad_push_event (pad=pad@entry=0x7fb7040098f0, event=0x7fb6e0005080) at gstpad.c:5402
#28 0x00007fb7203c53df in event_forward_func (pad=pad@entry=0x7fb7040098f0, data=data@entry=0x7fff226fcbe0) at gstpad.c:2994
#29 0x00007fb7203c0bd7 in gst_pad_forward (pad=0x7fb704009b30, forward=forward@entry=0x7fb7203c5310 <event_forward_func>, user_data=user_data@entry=0x7fff226fcbe0) at gstpad.c:2948
#30 0x00007fb7203c0d0e in gst_pad_event_default (pad=<optimized out>, parent=parent@entry=0x7fb70400fcd0, event=event@entry=0x7fb6e0005080) at gstpad.c:3045
#31 0x00007fb720926b62 in gst_audio_decoder_src_eventfunc (dec=0x7fb70400fcd0, event=0x7fb6e0005080) at gstaudiodecoder.c:2486
#32 0x00007fb7203ba742 in gst_pad_send_event_unchecked (pad=pad@entry=0x7fb704009b30, event=event@entry=0x7fb6e0005080, type=<optimized out>, type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5609
#33 0x00007fb7203baa3b in gst_pad_push_event_unchecked (pad=pad@entry=0x7fb71403e8a0, event=event@entry=0x7fb6e0005080, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5265
#34 0x00007fb7203c517e in gst_pad_push_event (pad=pad@entry=0x7fb71403e8a0, event=0x7fb6e0005080) at gstpad.c:5402
#35 0x00007fb7203c53df in event_forward_func (pad=pad@entry=0x7fb71403e8a0, data=data@entry=0x7fff226fd050) at gstpad.c:2994
#36 0x00007fb7203c0bd7 in gst_pad_forward (pad=0x7fb714044620, forward=forward@entry=0x7fb7203c5310 <event_forward_func>, user_data=user_data@entry=0x7fff226fd050) at gstpad.c:2948
#37 0x00007fb7203c0d0e in gst_pad_event_default (pad=<optimized out>, parent=<optimized out>, event=0x7fb6e0005080) at gstpad.c:3045
#38 0x00007fb7203ba742 in gst_pad_send_event_unchecked (pad=pad@entry=0x7fb714044620, event=event@entry=0x7fb6e0005080, type=<optimized out>, type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5609
#39 0x00007fb7203baa3b in gst_pad_push_event_unchecked (pad=pad@entry=0x7fb6fc00ca90, event=event@entry=0x7fb6e0005080, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5265
#40 0x00007fb7203c517e in gst_pad_push_event (pad=pad@entry=0x7fb6fc00ca90, event=0x7fb6e0005080) at gstpad.c:5402
#41 0x00007fb7203c53df in event_forward_func (pad=pad@entry=0x7fb6fc00ca90, data=data@entry=0x7fff226fd380) at gstpad.c:2994
#42 0x00007fb7203c0bd7 in gst_pad_forward (pad=0x7fb6fc00aa10, forward=forward@entry=0x7fb7203c5310 <event_forward_func>, user_data=user_data@entry=0x7fff226fd380) at gstpad.c:2948
#43 0x00007fb7203c0d0e in gst_pad_event_default (pad=<optimized out>, parent=<optimized out>, event=0x7fb6e0005080) at gstpad.c:3045
#44 0x00007fb7203ba742 in gst_pad_send_event_unchecked (pad=pad@entry=0x7fb6fc00aa10, event=event@entry=0x7fb6e0005080, type=<optimized out>, type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5609
#45 0x00007fb7203baa3b in gst_pad_push_event_unchecked (pad=pad@entry=0x7fb6c8292460, event=event@entry=0x7fb6e0005080, type=type@entry=GST_PAD_PROBE_TYPE_EVENT_UPSTREAM) at gstpad.c:5265
#46 0x00007fb7203c517e in gst_pad_push_event (pad=pad@entry=0x7fb6c8292460, event=0x7fb6e0005080) at gstpad.c:5402
#47 0x00007fb71ca444d1 in gst_input_selector_set_active_pad (pad=0x7fb6c8292460, self=0x7fb6c82911b0) at gstinputselector.c:1394
#48 gst_input_selector_set_property (object=<optimized out>, prop_id=<optimized out>, value=<optimized out>, pspec=<optimized out>) at gstinputselector.c:1426
#49 0x00007fb72010e7df in object_set_property (nqueue=0x141a620, value=0x7fff226fd640, pspec=0x7fb6c8003c50, object=0x7fb6c82911b0) at gobject.c:1415
#50 g_object_set_valist (object=object@entry=0x7fb6c82911b0, first_property_name=first_property_name@entry=0x7fb71dfb1b7c "active-pad", var_args=var_args@entry=0x7fff226fd708) at gobject.c:2159
#51 0x00007fb72010efcf in g_object_set (_object=_object@entry=0x7fb6c82911b0, first_property_name=first_property_name@entry=0x7fb71dfb1b7c "active-pad") at gobject.c:2269
#52 0x00007fb71df81ad0 in gst_play_bin_set_current_audio_stream (stream=<optimized out>, playbin=<optimized out>) at gstplaybin2.c:2074
#53 gst_play_bin_set_property (object=<optimized out>, prop_id=<optimized out>, value=<optimized out>, pspec=0x1233630) at gstplaybin2.c:2423
#54 0x00007fb72010e7df in object_set_property (nqueue=0x141a680, value=0x7fff226fd8e0, pspec=0x1233630, object=0x13f9980) at gobject.c:1415
#55 g_object_set_valist (object=object@entry=0x13f9980, first_property_name=first_property_name@entry=0x405c0e "current-audio", var_args=var_args@entry=0x7fff226fd9a8) at gobject.c:2159
#56 0x00007fb72010efcf in g_object_set (_object=0x13f9980, first_property_name=first_property_name@entry=0x405c0e "current-audio") at gobject.c:2269

