(gdb) bt
#0  0x00007f64de647ef3 in switch_frame_buffer_free (fb=0x0, frameP=0x7f64b0190dc0) at src/switch_utils.c:213
#1  0x00007f64ba1d78fd in stream_thread_run (thread=<optimized out>, obj=0x7f64a4901848) at stream_endpoint.c:215
#2  0x00007f64de9a6873 in dummy_worker (opaque=0x7f64ce3289e0) at threadproc/unix/thread.c:151
#3  0x00007f64ddab74a4 in start_thread (arg=0x7f64b0191700) at pthread_create.c:456
#4  0x00007f64dd129d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
(gdb) bt full
#0  0x00007f64de647ef3 in switch_frame_buffer_free (fb=0x0, frameP=0x7f64b0190dc0) at src/switch_utils.c:213
        old_frame = 0x7f64a49028b8
        node = 0x7f64b0190d70
        __PRETTY_FUNCTION__ = "switch_frame_buffer_free"
#1  0x00007f64ba1d78fd in stream_thread_run (thread=<optimized out>, obj=0x7f64a4901848) at stream_endpoint.c:215
        frame = 0x7f64a4998620
        fin = 1
        pop = 0x7f64a4998620
        i = <optimized out>
        tech_pvt = 0x7f64a4901848
        ebytes = <optimized out>
        ebuf = 0x7f64a04a6800 "f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/f39/"...
        start = 1592878940393174
        __func__ = "stream_thread_run"
        __PRETTY_FUNCTION__ = "stream_thread_run"
#2  0x00007f64de9a6873 in dummy_worker (opaque=0x7f64ce3289e0) at threadproc/unix/thread.c:151
        thread = 0x7f64ce3289e0
#3  0x00007f64ddab74a4 in start_thread (arg=0x7f64b0191700) at pthread_create.c:456
        __res = <optimized out>
        pd = 0x7f64b0191700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140070427891456, -1143441648889015643, 140070461426030, 140070461426031, 140070427643904, 3, 1074334817053921957, 1074133482072920741}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0,
              0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#4  0x00007f64dd129d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
No locals.
(gdb)