(gdb) bt
#0  0x00007f57a4397e4b in run_failure_handlers (t=0x7f579d31b8c8, rpl=0xffffffffffffffff, code=408, extra_flags=32) at t_reply.c:1020
#1  0x00007f57a439b6ff in t_should_relay_response (Trans=0x7f579d31b8c8, new_code=408, branch=0, should_store=0x7ffdc1d48efc, should_relay=0x7ffdc1d48f00, cancel_data=0x7ffdc1d48fb0,
    reply=0xffffffffffffffff) at t_reply.c:1390
#2  0x00007f57a43a04ae in relay_reply (t=0x7f579d31b8c8, p_msg=0xffffffffffffffff, branch=0, msg_status=408, cancel_data=0x7ffdc1d48fb0, do_put_on_wait=0) at t_reply.c:1821
#3  0x00007f57a43f0b80 in fake_reply (t=0x7f579d31b8c8, branch=0, code=408) at timer.c:294
#4  0x00007f57a43f100d in final_response_handler (r_buf=0x7f579d31baf0, t=0x7f579d31b8c8) at timer.c:455
#5  0x00007f57a43f10bc in retr_buf_handler (ticks=1687494363, tl=0x7f579d31bb10, p=0x1f40) at timer.c:511
#6  0x00000000004bb4f9 in slow_timer_main () at core/timer.c:1104
#7  0x000000000042655f in main_loop () at main.c:1727
#8  0x000000000042e56a in main (argc=15, argv=0x7ffdc1d497f8) at main.c:2802