#0  0x00007ffff728ef56 in g_source_attach () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ffff7b1e228 in gst_bus_add_watch_full_unlocked (notify=<optimized out>, user_data=0x7fffc801a0c0, func=0x403d50 <gst_worker_message>, priority=<optimized out>, bus=<optimized out>) at gstbus.c:867
#2  gst_bus_add_watch_full_unlocked (bus=<optimized out>, priority=<optimized out>, func=0x403d50 <gst_worker_message>, user_data=0x7fffc801a0c0, notify=<optimized out>) at gstbus.c:846
#3  0x00007ffff7b1e367 in gst_bus_add_watch_full (bus=0x991c10, priority=priority@entry=0, func=func@entry=0x403d50 <gst_worker_message>, user_data=user_data@entry=0x7fffc801a0c0, notify=notify@entry=0x0) at gstbus.c:916
#4  0x00007ffff7b1e390 in gst_bus_add_watch (bus=<optimized out>, func=func@entry=0x403d50 <gst_worker_message>, user_data=user_data@entry=0x7fffc801a0c0) at gstbus.c:948
#5  0x00000000004041b1 in gst_worker_prepare (worker=0x7fffc801a0c0) at gstworker.c:480
...