(gdb) bt full
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
        set = {__val = {18446744067266838239, 0, 1011905858316665615, 721995440312963679, 798912905637725262, 5643677831529301775, 14583431671641719254, 14583431671641719254, 0, 0,
            0, 0, 0, 0, 0, 0}}
        pid = <optimized out>
        tid = <optimized out>
#1  0x00007f31793e142a in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0 <repeats 16 times>}}, sa_flags = 0, sa_restorer = 0x7f317a8f62b0 <freed_list2>}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f317a6f0746 in md_thread (arg=<optimized out>) at /opt/accel-ppp-debug/accel-pppd/triton/md.c:77
        i = <optimized out>
        n = <optimized out>
        r = <optimized out>
        h = <optimized out>
        set = {__val = {18446744067266838271, 18446744073709551615 <repeats 15 times>}}
#3  0x00007f317a2d04a4 in start_thread (arg=0x7f3175f18700) at pthread_create.c:456
        __res = <optimized out>
        pd = 0x7f3175f18700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139850408888064, -2065850433974943148, 140736287668062, 140736287668063, 139850400497664, 3, 2104997536096207444,
                2104988227072705108}, 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  0x00007f3179495d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97