(gdb) bt full
#0  0x0000000000000000 in ?? ()
No symbol table info available.
#1  0x00007f137e4a648b in su_epoll_port_wait_events (self=0x7f137c40e100, tout=267) at su_epoll_port.c:510
        ser = 0x7f135965e330
        magic = 0x0
        j = 0
        n = 1
        events = 0
        index = 65
        version = 118
        M = 4
        ev = {{events = 1, data = {ptr = 0x41, fd = 65, u32 = 65, u64 = 65}}, {events = 0, data = {ptr = 0xe295157b, fd = -493546117, u32 = 3801421179, u64 = 3801421179}}, {events = 0, data = {ptr = 0x4133700000000, fd = 0, u32 = 0,
              u64 = 1147026850971648}}, {events = 0, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}}
        __PRETTY_FUNCTION__ = "su_epoll_port_wait_events"
#2  0x00007f137e4a4a47 in su_base_port_run (self=0x7f137c40e100) at su_base_port.c:349
        tout = 267
        tout2 = 0
        __PRETTY_FUNCTION__ = "su_base_port_run"
#3  0x00007f137e4abcc3 in su_port_run (self=0x7f137c40e100) at su_port.h:326
        base = 0x7f137c40e100
#4  0x00007f137e4acda8 in su_root_run (self=0x7f137c42c040) at su_root.c:819
        __PRETTY_FUNCTION__ = "su_root_run"
#5  0x00007f137e4ab445 in su_pthread_port_clone_main (varg=0x7f1383c86580) at su_pthread_port.c:343
        arg = 0x0
        task = {{sut_port = 0x7f137c40e100, sut_root = 0x7f137c42c040}}
        zap = 1
#6  0x00007f138ab7f4a4 in start_thread (arg=0x7f1381bff700) at pthread_create.c:456
        __res = <optimized out>
        pd = 0x7f1381bff700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139721757947648, -1056618135308245121, 139721792054398, 139721792054399, 139721749557248, 3, 1112705873231701887, 1112729993566054271}, 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"
#7  0x00007f138a1f1d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97