.
Thread 2 (process 5148):
#0  0x00007ff9dd8f74b3 in *__GI___poll (fds=<value optimized out>, 
    nfds=<value optimized out>, timeout=<value optimized out>)
    at ../sysdeps/unix/sysv/linux/poll.c:87
	resultvar = 18446744073709551100
	oldtype = 0
	result = <value optimized out>
#1  0x0000000000c94e70 in ?? ()
No symbol table info available.
#2  0x00000000ffffffff in ?? ()
No symbol table info available.
#3  0x0000000000000003 in ?? ()
No symbol table info available.
#4  0x0000000000c94e70 in ?? ()
No symbol table info available.
#5  0x0000000000000001 in ?? ()
No symbol table info available.
#6  0x00007ff9de7321a0 in g_main_context_iterate (context=0xc94be0, 
    block=<value optimized out>, dispatch=1)
    at /build/buildd/glib2.0-2.27.5/glib/gmain.c:4319
	max_priority = 2147483647
	timeout = -1
	some_ready = <value optimized out>
	nfds = 3
	allocated_nfds = <value optimized out>
	fds = (GPollFD *) 0xc94e70
#7  0x0000000000c6d740 in ?? ()
No symbol table info available.
#8  0x00007ff9de9d87a8 in test_run_name () from /lib/libglib-2.0.so.0
No symbol table info available.
#9  0x00000001de2d1e40 in ?? ()
No symbol table info available.
#10 0x00007ff9de9d87e0 in ?? () from /lib/libglib-2.0.so.0
No symbol table info available.
#11 0x0000000000c94ccc in ?? ()
No symbol table info available.
#12 0x7fffffffffffffff in ?? ()
No symbol table info available.
#13 0x0000000000000003 in ?? ()
No symbol table info available.
#14 0x0000000000c94cc0 in ?? ()
No symbol table info available.
#15 0x00007ff9de2d03d0 in ?? () at pthread_mutex_lock.c:297
   from /lib/libpthread.so.0
No symbol table info available.
#16 0x00007ff9de9d8ec0 in ?? () from /lib/libglib-2.0.so.0
No symbol table info available.
#17 0x0000000000c94ccc in ?? ()
No symbol table info available.
#18 0x00007ff9de2d03d0 in ?? () at pthread_mutex_lock.c:297
   from /lib/libpthread.so.0
No symbol table info available.
#19 0x0000000000000003 in ?? ()
No symbol table info available.
#20 0x00007ff9de732a7a in g_main_loop_run (loop=0xc94e70)
    at /build/buildd/glib2.0-2.27.5/glib/gmain.c:4319
	__PRETTY_FUNCTION__ = "g_main_loop_run"
#21 0x00007ff9da34d6f4 in gdbus_shared_thread_func (
    data=<value optimized out>)
    at /build/buildd/glib2.0-2.27.5/gio/gdbusprivate.c:471
No locals.
#22 0x00007ff9de7595c4 in g_thread_create_proxy (data=0xc94ce0)
    at /build/buildd/glib2.0-2.27.5/glib/gthread.c:1042
	thread = (GRealThread *) 0xc94ce0
	__PRETTY_FUNCTION__ = "g_thread_create_proxy"
#23 0x00007ff9de2cdd8c in start_thread (arg=0x7ff9d9be9700)
    at allocatestack.c:304
	pd = (struct pthread *) 0x7ff9d9be9700
	now = <value optimized out>
	unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140711076730624, 
        8689265312285839992, 140735127832848, 140711076731328, 0, 3, 
        -8690315886536699272, -8690323739376627080}, mask_was_saved = 0}}, 
  priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, 
      canceltype = 0}}}
	not_first_call = 0
	robust = <value optimized out>
	sp = <value optimized out>
	freesize = <value optimized out>
	__PRETTY_FUNCTION__ = "start_thread"
#24 0x00007ff9dd90461d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#25 0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (process 5140):
#0  0x0000000000000000 in ?? ()
No symbol table info available.
#1  0x00007ff9cf21ccf0 in nux::IOpenGLSurface::UnlockRect (this=0x110c450)
    at ./IOpenGLSurface.cpp:260
	w = Unhandled dwarf expression opcode 0x9f
Current language:  auto; currently c