#0  0x00007fb32e69a70f in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#1  0x00007fb32e69faaf in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#2  0x00007fb32e69065a in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#3  0x00007fb32e1352d3 in _mesa_BlitFramebuffer () from /usr/lib/x86_64-linux-gnu/libdricore9.2.0.so.1
No symbol table info available.
#4  0x00007fb32f2bb9a7 in ?? () from /usr/lib/virtualbox/VBoxSharedCrOpenGL.so
No symbol table info available.
#5  0x00007fb32f337125 in ?? () from /usr/lib/virtualbox/VBoxSharedCrOpenGL.so
No symbol table info available.
#6  0x00007fb32f3390b0 in crUnpack () from /usr/lib/virtualbox/VBoxSharedCrOpenGL.so
No symbol table info available.
#7  0x00007fb32f2bc4d5 in crServerServiceClients () from /usr/lib/virtualbox/VBoxSharedCrOpenGL.so
No symbol table info available.
#8  0x00007fb32f2b6368 in ?? () from /usr/lib/virtualbox/VBoxSharedCrOpenGL.so
No symbol table info available.
#9  0x00007fb32f2b95fe in crVBoxServerCrHgsmiCmd () from /usr/lib/virtualbox/VBoxSharedCrOpenGL.so
No symbol table info available.
#10 0x00007fb32f2b4e32 in ?? () from /usr/lib/virtualbox/VBoxSharedCrOpenGL.so
No symbol table info available.
#11 0x00007fb335579f7e in ?? () from /usr/lib/virtualbox/components/VBoxC.so
No symbol table info available.
#12 0x00007fb3355787e2 in ?? () from /usr/lib/virtualbox/components/VBoxC.so
No symbol table info available.
#13 0x00007fb3638d572c in ?? () from /usr/lib/virtualbox/VBoxRT.so
No symbol table info available.
#14 0x00007fb363927dec in ?? () from /usr/lib/virtualbox/VBoxRT.so
No symbol table info available.
#15 0x00007fb364180f6e in start_thread (arg=0x7fb32f604700) at pthread_create.c:311
        __res = <optimized out>
        pd = 0x7fb32f604700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140407570712320, 8574053924987486336, 0, 140408459595872, 140407653108624, 4096, -8531094921169584000, -8530978030967701376}, 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"
#16 0x00007fb363ca7e2d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.