.
Thread 2 (Thread 0x7f9f66f42700 (LWP 1658)):
#0  0x00007f9f733f7bb7 in epoll_wait (epfd=39, events=0x7f9f66f40f10, maxevents=256, timeout=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
        resultvar = 18446744073709551612
        sc_cancel_oldtype = 0
        sc_ret = <optimized out>
#1  0x00005568c3b8c0d7 in ?? ()
No symbol table info available.
#2  0x00005568c3b8986e in ?? ()
No symbol table info available.
#3  0x00007f9f736ce6db in start_thread (arg=0x7f9f66f42700) at pthread_create.c:463
        pd = 0x7f9f66f42700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140322603804416, -3724532247683034325, 140322603801792, 0, 0, 140723235440144, 3706744308919800619, 3706791791607517995}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#4  0x00007f9f733f788f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.
.
Thread 1 (Thread 0x7f9f75fe6600 (LWP 1581)):
#0  __GI___pthread_once (once_control=0x7f9f736c5270 <once>, init_routine=0x7f9f73407060 <init>) at pthread_once.c:139
        val = <optimized out>
#1  0x00007f9f7340714f in __GI___backtrace (array=<optimized out>, size=<optimized out>) at ../sysdeps/x86_64/backtrace.c:106
        __p = <optimized out>
        arg = {array = 0x7ffcae75bc20, cfa = 0, cnt = -1, size = 64}
        once = 0
#2  0x00005568c3b878ad in xorg_backtrace ()
No symbol table info available.
#3  0x00005568c3b8b649 in ?? ()
No symbol table info available.
#4  <signal handler called>
No locals.
#5  0x00005568c3a47f28 in dixLookupResourceByClass ()
No symbol table info available.
#6  0x00005568c3a4812f in LegalNewID ()
No symbol table info available.
#7  0x00005568c3a1d0cb in ?? ()
No symbol table info available.
#8  0x00005568c3a21e98 in ?? ()
No symbol table info available.
#9  0x00005568c3a25ee0 in ?? ()
No symbol table info available.
#10 0x00007f9f732f7b97 in __libc_start_main (main=0x5568c3a0fb50, argc=12, argv=0x7ffcae75c7b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffcae75c7a8) at ../csu/libc-start.c:310
        self = <optimized out>
        __self = <optimized out>
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 7394429916411695915, 93908447066976, 140723235440560, 0, 0, 3726325501520614187, 3706792318909780779}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7f9f75e01733 <_dl_init+259>, 0x7f9f75def438}, data = {prev = 0x0, cleanup = 0x0, canceltype = 1977620275}}}
        not_first_call = <optimized out>
#11 0x00005568c3a0fb8a in _start ()
No symbol table info available.