Comment 1 for bug 960893

The core dump output:
(gdb) bt full
#0 __libc_do_syscall () at ../ports/sysdeps/unix/sysv/linux/arm/eabi/libc-do-syscall.S:47
No locals.
#1 0xb6d5b650 in raise (sig=5) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:46
        _a1 = <optimized out>
        _a3tmp = 5
        _a1tmp = 7667
        _a3 = <optimized out>
        _a2tmp = 7667
        _a2 = <optimized out>
        _name = <optimized out>
        _sys_result = <optimized out>
        pid = 7667
#2 0xb6da4a94 in g_logv (log_domain=0xb6ef0614 "Clutter", log_level=G_LOG_LEVEL_ERROR, format=0xb6efa1ac "Unknown input backend", args1=...) at /build/buildd/glib2.0-2.31.22/./glib/gmessages.c:758
        domain = 0x0
        data = <optimized out>
        depth = <optimized out>
        log_func = <optimized out>
        domain_fatal_mask = <optimized out>
        masquerade_fatal = <optimized out>
        test_level = <optimized out>
        was_fatal = 0
        was_recursion = 0
        i = <optimized out>
#3 0xb6da4b84 in g_log (log_domain=<optimized out>, log_level=<optimized out>, format=0xb6efa1ac "Unknown input backend") at /build/buildd/glib2.0-2.31.22/./glib/gmessages.c:792
        args = {__ap = 0xbe83d54c}
#4 0xb6ea29be in clutter_backend_real_init_events (backend=<optimized out>) at ./clutter-backend.c:531
No locals.
#5 clutter_backend_real_init_events (backend=0x5f3c10) at ./clutter-backend.c:459
        input_backend = 0x0
#6 0xb6ea2f1e in _clutter_backend_init_events (backend=0x5f3c10) at ./clutter-backend.c:871
        klass = 0x5f00b0
        __PRETTY_FUNCTION__ = "_clutter_backend_init_events"
#7 0xb6eb96fa in clutter_init_real (error=<optimized out>) at ./clutter-main.c:1597
        ctx = 0x5f1a20
        backend = <optimized out>
#8 0xb6eb9840 in post_parse_hook (error=0xbe83d63c, context=<optimized out>, group=<optimized out>, data=<optimized out>) at ./clutter-main.c:1783
        clutter_context = 0x5f1a20
        backend = 0x5f3c10
#9 post_parse_hook (context=<optimized out>, group=<optimized out>, data=<optimized out>, error=0xbe83d63c) at ./clutter-main.c:1751
No locals.
#10 0xb6da741e in g_option_context_parse (context=<optimized out>, argc=0xbe83d664, argv=0xbe83d660, error=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/goption.c:2025
        i = 1
        j = <optimized out>
        k = <optimized out>
        list = <optimized out>
#11 0xb6eb9a2e in clutter_parse_args (error=0xbe83d638, argv=0xbe83d660, argc=0xbe83d664) at ./clutter-main.c:2019
        clutter_group = <optimized out>
        internal_error = 0x0
        ret = 1
        option_context = 0x5f2248
        cogl_group = <optimized out>
#12 clutter_init (argc=0xbe83d664, argv=0xbe83d660) at ./clutter-main.c:2081
        ctx = <optimized out>
        error = 0x0
        res = <optimized out>
#13 0x00008860 in main (argc=1, argv=0xbe83d7c4) at main.c:20
        stage_color = {red = 0 '\000', green = 0 '\000', blue = 0 '\000', alpha = 255 '\377'}
        stage = 0x0