#0  0x00007f7484bb0cb1 in ?? () from /usr/lib/virtualbox/VBoxDD.so
No symbol table info available.
#1  0x00007f7484ba8379 in ?? () from /usr/lib/virtualbox/VBoxDD.so
No symbol table info available.
#2  0x00007f7484ba617e in ?? () from /usr/lib/virtualbox/VBoxDD.so
No symbol table info available.
#3  0x00007f74952c629d in ?? () from /usr/lib/virtualbox/VBoxVMM.so
No symbol table info available.
#4  0x00007f749d050fdc in ?? () from /usr/lib/virtualbox/VBoxRT.so
No symbol table info available.
#5  0x00007f749d09dd93 in ?? () from /usr/lib/virtualbox/VBoxRT.so
No symbol table info available.
#6  0x00007f749d8d8e9a in start_thread (arg=0x7f74698b3700) at pthread_create.c:308
        __res = <optimized out>
        pd = 0x7f74698b3700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 2907650900678074748, 140138455749440, 140137963665856, 0, 3, -2976072308329619076, -2975975496530861700}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f749d401ccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#8  0x0000000000000000 in ?? ()
No symbol table info available.