#0  0x000055dc540545cc in ?? ()
No symbol table info available.
#1  0x000055dc54054951 in ?? ()
No symbol table info available.
#2  0x000055dc54054f68 in ?? ()
No symbol table info available.
#3  0x000055dc54055054 in ?? ()
No symbol table info available.
#4  0x000055dc5403096f in ?? ()
No symbol table info available.
#5  0x000055dc540794ba in ?? ()
No symbol table info available.
#6  0x000055dc5407f759 in ?? ()
No symbol table info available.
#7  0x000055dc54087b75 in ?? ()
No symbol table info available.
#8  0x000055dc53f4470a in ?? ()
No symbol table info available.
#9  0x00007faf2983bbdc in ?? () from /usr/lib/virtualbox/VBoxRT.so
No symbol table info available.
#10 0x00007faf298c658b in ?? () from /usr/lib/virtualbox/VBoxRT.so
No symbol table info available.
#11 0x00007faf29ba874a in start_thread (arg=0x7faf0f003700) at pthread_create.c:456
        __res = <optimized out>
        pd = 0x7faf0f003700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140389847676672, 6704566830758041285, 140389853468542, 140389853468543, 140389847677376, 140389847676672, -6749358711313852731, -6749423081335744827}, 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"
#12 0x00007faf28795caf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
No locals.