(gdb) bt full
#0  0x00007f06ec56b945 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f06ef0a6eb3 in [IDLE THREAD] work_q_wait (tp=0x5607a9346180) at src/nunc-stans/ns/ns_thrpool.c:344
        job = 0x0
        thr = <optimized out>
        tp = 0x5607a9346180
        result = <optimized out>
        is_shutdown = 0
#2  0x00007f06ef0a6eb3 in worker_thread_func (arg=<optimized out>) at src/nunc-stans/ns/ns_thrpool.c:396
        job = 0x0
        thr = <optimized out>
        tp = 0x5607a9346180
        result = <optimized out>
        is_shutdown = 0
#3  0x00007f06ec567dd5 in start_thread () at /lib64/libpthread.so.0