#0  0x00007f0c380fcd05 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
        resultvar = 0
        pid = <value optimized out>
        selftid = 325
#1  0x00007f0c38100ab6 in abort () at abort.c:92
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x481, sa_sigaction = 0x481}, sa_mask = {__val = {139690458072718, 139690436834784, 139690458064602, 140733948983296, 139690457102434, 206158430232, 140733948983312, 140733948983088, 139690457013620, 206158430256, 140733948983336, 30859536, 139690460414400, 113, 0, 140733948989205}}, sa_flags = 941729498, sa_restorer = 0x7f0c36ddad60}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f0c380f57c5 in __assert_fail (assertion=0x7f0c36ddad6b "backend != ((void *)0)", file=<value optimized out>, line=1153, function=<value optimized out>) at assert.c:81
        buf = 0x1d6e110 "plymouthd: ./plugin.c:1153: open_input_source: Assertion `backend != ((void *)0)' failed.\n"
#3  0x00007f0c36dd6d96 in open_input_source (backend=0x0, input_source=0x1cd07e8) at ./plugin.c:1153
        terminal_fd = <value optimized out>
        __PRETTY_FUNCTION__ = "open_input_source"
#4  0x00007f0c3867470b in ply_event_loop_handle_disconnect_for_source (loop=0x1cc6140) at ply-event-loop.c:1083
        next_node = 0x1d74ff0
        destination = 0x1cd2550
        node = <value optimized out>
#5  ply_event_loop_disconnect_source (loop=0x1cc6140) at ply-event-loop.c:1185
No locals.
#6  ply_event_loop_process_pending_events (loop=0x1cc6140) at ply-event-loop.c:1330
        source = 0x1cd2080
        status = 30220416
        is_disconnected = true
        number_of_received_events = 1
        i = <value optimized out>
        events = 0x7fff2d0978c0
        __PRETTY_FUNCTION__ = "ply_event_loop_process_pending_events"
#7  0x00007f0c38674e10 in ply_event_loop_run (loop=0x1cc6140) at ply-event-loop.c:1365
No locals.
#8  0x000000000040a357 in main (argc=<value optimized out>, argv=<value optimized out>) at main.c:1960
        state = {loop = 0x1cc6140, boot_server = 0x1ccce80, pixel_displays = 0x1cc89c0, text_displays = 0x1cc89e0, keyboard = 0x1cd2780, boot_splash = 0x1de9890, session = 0x1cc9a50, boot_buffer = 0x1cc8a20, progress = 0x1ccd160, keystroke_triggers = 0x1cc7950, entry_triggers = 0x1cc7970, entry_buffer = 0x1cc7990, command_parser = 0x1cc6010, mode = PLY_MODE_BOOT, renderer = 0x1cce9f0, terminal = 0x1cce8c0, deactivate_trigger = 0x0, quit_trigger = 0x0, kernel_command_line = "BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=3d4f8974-c712-47e5-a635-8bb7a4b9c504 ro quiet splash vt.handoff=7\n", '\000' <repeats 393 times>, no_boot_log = 0, showing_details = 1, system_initialized = 1, is_redirected = 0, is_attached = 0, should_be_attached = 1, should_retain_splash = 0, is_inactive = 1, kernel_console_tty = 0x0, override_splash_path = 0x0, system_default_splash_path = 0x0, distribution_default_splash_path = 0x0, default_tty = 0x40b4d2 "/dev/tty7", number_of_errors = 0, pending_messages = 0x1cc8a00}
        exit_code = <value optimized out>
        should_help = false
        no_daemon = false
        debug = false
        attach_to_session = true
        daemon_handle = 0x1cc6890
        mode_string = 0x1cc6890 "\340\341\314\001"
        tty = 0x0
        __func__ = "main"