(gdb) bt full
#0  ast_channel_tech_pvt (chan=chan@entry=0x0) at channel_internal_api.c:756
No locals.
#1  0x00007ff42c744d95 in hangup (data=0x7ff445c32568) at chan_pjsip.c:1850
        h_data = 0x7ff445c32568
        ast = 0x0
        channel = <optimized out>
        pvt = <optimized out>
        session = <optimized out>
        cause = <optimized out>
#2  0x00000000005b9f78 in ast_taskprocessor_execute (tps=tps@entry=0x7ff43847cd28) at taskprocessor.c:967
        local = {local_data = 0x7ff4381bde68, data = 0x7ff43847cd28}
        t = 0x7ff445c7ca60
        size = <optimized out>
        __PRETTY_FUNCTION__ = "ast_taskprocessor_execute"
#3  0x00000000005c1788 in execute_tasks (data=0x7ff43847cd28) at threadpool.c:1322
        tps = 0x7ff43847cd28
#4  0x00000000005b9f78 in ast_taskprocessor_execute (tps=0x2a51cd8) at taskprocessor.c:967
        local = {local_data = 0x7ff3f5dc8de0, data = 0x7ff4201742c0}
        t = 0x7ff4466e6f20
        size = <optimized out>
        __PRETTY_FUNCTION__ = "ast_taskprocessor_execute"
#5  0x00000000005c1b7c in threadpool_execute (pool=0x29aebc8) at threadpool.c:351
No locals.
#6  worker_active (worker=0x7ff4201742b8) at threadpool.c:1105
No locals.
#7  worker_start (arg=arg@entry=0x7ff4201742b8) at threadpool.c:1024
        worker = 0x7ff4201742b8
        saved_state = <optimized out>
        __PRETTY_FUNCTION__ = "worker_start"
#8  0x00000000005cc299 in dummy_start (data=<optimized out>) at utils.c:1235
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {140686487140944, -7609939895454911746, 140686741273776, 0, 
                140685778655680, 507904, 7603171571896038142, -7609940692098469122}, __mask_was_saved = 0}}, __pad = {
            0x7ff3f5dc8ef0, 0x0, 0x0, 0x0}}
        __cancel_arg = 0x7ff3f5dc9700
        __not_first_call = <optimized out>
        ret = <optimized out>
        a = {start_routine = 0x5c17c0 <worker_start>, data = 0x7ff4201742b8, name = <optimized out>}
#9  0x00007ff49770cce2 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#10 0x00007ff496c9d8cd in clone () from /lib64/libc.so.6
No symbol table info available.