Thread 1 (Thread 0x7f1e73bc9700 (LWP 26246)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f1e70b1153c in g_cond_wait (cond=0x4302170, mutex=0x4302168)
    at /tmp/buildd/glib2.0-2.42.1/./glib/gthread-posix.c:1396
#2  0x00007f1e3526b4c0 in gst_jack_audio_client_set_active (client=0x43015c0, 
    active=0) at gstjackaudioclient.c:604
#3  0x00007f1e35268c64 in gst_jack_ring_buffer_release (buf=0x6180210)
    at gstjackaudiosink.c:539
#4  0x00007f1e5dbe1c48 in gst_audio_ring_buffer_release (buf=0x6180210)
    at gstaudioringbuffer.c:682
#5  0x00007f1e5dbfe0df in gst_audio_base_sink_change_state (element=0x1, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstaudiobasesink.c:2300
#6  0x00007f1e5f5ae2e2 in gst_element_change_state (element=0x34bd340, 
    transition=0) at gstelement.c:2601
#7  0x00007f1e5f5ae8ea in gst_element_set_state_func (element=0x34bd340, 
    state=GST_STATE_READY) at gstelement.c:2557
#8  0x00007f1e5f58f385 in gst_bin_element_set_state (next=<optimized out>, 
    current=<optimized out>, start_time=<optimized out>, 
    base_time=<optimized out>, element=<optimized out>, bin=<optimized out>)
    at gstbin.c:2328
#9  gst_bin_change_state_func (element=0x0, transition=0) at gstbin.c:2665
#10 0x00007f1e5f5ae2e2 in gst_element_change_state (element=0x6093a90, 
    transition=0) at gstelement.c:2601
#11 0x00007f1e5f5ae8ea in gst_element_set_state_func (element=0x6093a90, 
    state=GST_STATE_READY) at gstelement.c:2557
#12 0x00007f1e5f58f385 in gst_bin_element_set_state (next=<optimized out>, 
    current=<optimized out>, start_time=<optimized out>, 
    base_time=<optimized out>, element=<optimized out>, bin=<optimized out>)
    at gstbin.c:2328
#13 gst_bin_change_state_func (element=0x0, transition=0) at gstbin.c:2665
#14 0x00007f1e5f5ae2e2 in gst_element_change_state (element=0x617f2d0, 
    transition=0) at gstelement.c:2601
#15 0x00007f1e5f5ae8ea in gst_element_set_state_func (element=0x617f2d0, 
    state=GST_STATE_READY) at gstelement.c:2557
#16 0x00007f1e5f58f385 in gst_bin_element_set_state (next=<optimized out>, 
    current=<optimized out>, start_time=<optimized out>, 
    base_time=<optimized out>, element=<optimized out>, bin=<optimized out>)
    at gstbin.c:2328
#17 gst_bin_change_state_func (element=0x0, transition=0) at gstbin.c:2665
#18 0x00007f1e343f4316 in gst_play_sink_change_state (element=0x5b0c3d0, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstplaysink.c:4803
#19 0x00007f1e5f5ae2e2 in gst_element_change_state (element=0x5b0c3d0, 
    transition=0) at gstelement.c:2601
#20 0x00007f1e5f5ae8ea in gst_element_set_state_func (element=0x5b0c3d0, 
    state=GST_STATE_READY) at gstelement.c:2557
#21 0x00007f1e5f58f385 in gst_bin_element_set_state (next=<optimized out>, 
    current=<optimized out>, start_time=<optimized out>, 
    base_time=<optimized out>, element=<optimized out>, bin=<optimized out>)
    at gstbin.c:2328
#22 gst_bin_change_state_func (element=0x0, transition=0) at gstbin.c:2665
#23 0x00007f1e343efe97 in gst_play_bin_change_state (element=0x6179050, 
    transition=GST_STATE_CHANGE_PAUSED_TO_READY) at gstplaybin2.c:5614
#24 0x00007f1e5f5ae2e2 in gst_element_change_state (element=0x6179050, 
    transition=0) at gstelement.c:2601
#25 0x00007f1e5f5ae4d0 in gst_element_change_state (element=0x6179050, 
    transition=0) at gstelement.c:2638
#26 0x00007f1e5f5ae8ea in gst_element_set_state_func (element=0x6179050, 
    state=GST_STATE_NULL) at gstelement.c:2557
#27 0x00007f1e72328dc0 in ffi_call_unix64 ()
   from /usr/lib/x86_64-linux-gnu/libffi.so.6
