.
Thread 3 (Thread 13340):
#0  0x00007f94d6cff52b in open64 () from /lib/libc.so.6
#1  0x00007f94ce403c3a in open (path=0x20a1180 "/dev/sr0", 
    exclusive=<value optimized out>, code=0x7f94cd306f9c)
    at /usr/include/bits/fcntl2.h:58
No locals.
#2  brasero_device_handle_open (path=0x20a1180 "/dev/sr0", 
    exclusive=<value optimized out>, code=0x7f94cd306f9c) at scsi-sg.c:178
        fd = <value optimized out>
        flags = 2050
        handle = <value optimized out>
#3  0x00007f94ce3ff5d1 in brasero_drive_probe_thread (data=0x2002eb0)
    at brasero-drive.c:1018
        counter = <value optimized out>
        device = 0x20a1180 "/dev/sr0"
        code = BRASERO_SCSI_ERR_UNKNOWN
        priv = 0x2002ed0
        handle = <value optimized out>
        drive = 0x2002eb0
#4  0x00007f94d8257c14 in g_thread_create_proxy (data=0x225d1d0)
    at /build/buildd/glib2.0-2.21.4/glib/gthread.c:635
        __PRETTY_FUNCTION__ = "g_thread_create_proxy"
#5  0x00007f94da219a04 in start_thread () from /lib/libpthread.so.0
#6  0x00007f94d6d0d5fd in clone () from /lib/libc.so.6
#7  0x0000000000000000 in ?? ()
.
Thread 2 (Thread 13339):
#0  0x00007f94da21e82d in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x00007f94da860672 in g_cond_timed_wait_posix_impl (cond=0x1ff9394, 
    entered_mutex=0x80, abs_time=<value optimized out>)
    at /build/buildd/glib2.0-2.21.4/gthread/gthread-posix.c:242
        result = <value optimized out>
        end_time = {tv_sec = 1250263823, tv_nsec = 596003000}
        timed_out = <value optimized out>
        __PRETTY_FUNCTION__ = "g_cond_timed_wait_posix_impl"
#2  0x00007f94d8209f8f in g_async_queue_pop_intern_unlocked (queue=0x1ff2fd0, 
    try=0, end_time=0x7f94cf7e5fc0)
    at /build/buildd/glib2.0-2.21.4/glib/gasyncqueue.c:365
        retval = <value optimized out>
        __PRETTY_FUNCTION__ = "g_async_queue_pop_intern_unlocked"
#3  0x00007f94d82590b0 in g_thread_pool_wait_for_new_task (
    data=<value optimized out>)
    at /build/buildd/glib2.0-2.21.4/glib/gthreadpool.c:220
        end_time = {tv_sec = 1250263823, tv_usec = 596003}
#4  g_thread_pool_thread_proxy (data=<value optimized out>)
    at /build/buildd/glib2.0-2.21.4/glib/gthreadpool.c:254
        task = 0x1ff2f20
        pool = 0x1ff2f70
#5  0x00007f94d8257c14 in g_thread_create_proxy (data=0x1ff3830)
    at /build/buildd/glib2.0-2.21.4/glib/gthread.c:635
        __PRETTY_FUNCTION__ = "g_thread_create_proxy"
#6  0x00007f94da219a04 in start_thread () from /lib/libpthread.so.0
#7  0x00007f94d6d0d5fd in clone () from /lib/libc.so.6
#8  0x0000000000000000 in ?? ()
.
Thread 1 (Thread 13338):
#0  0x00007f94d6cacd42 in strcmp () from /lib/libc.so.6
#1  0x00007f94ce3f492d in brasero_medium_monitor_get_drive (
    monitor=<value optimized out>, device=0x0) at brasero-medium-monitor.c:116
        drive = 0x2002eb0
        drive_device = 0x20a112f ""
        iter = 0x2024850
        __PRETTY_FUNCTION__ = "brasero_medium_monitor_get_drive"
#2  0x00007f94ce3f5506 in brasero_medium_monitor_init (object=0x2267c00)
    at brasero-medium-monitor.c:632
        device = 0x0
        iter = 0x20b77a0
        drives = 0x0
        volumes = <value optimized out>
        drive = 0x0
        priv = 0x2267c20
#3  0x00007f94d8929fe7 in IA__g_type_create_instance (
    type=<value optimized out>)
    at /build/buildd/glib2.0-2.21.4/gobject/gtype.c:1674
        node = 0x219d7a0
        instance = 0x2267c00
        class = 0x20a9df0
        i = 3659650736
#4  0x00007f94d890ddac in g_object_constructor (type=34214272, 
    n_construct_properties=0, construct_params=0x0)
    at /build/buildd/glib2.0-2.21.4/gobject/gobject.c:1338
        object = 0x1f43f38
#5  0x00007f94d890e7b6 in IA__g_object_newv (
    object_type=<value optimized out>, n_parameters=0, 
    parameters=<value optimized out>)
    at /build/buildd/glib2.0-2.21.4/gobject/gobject.c:1215
        nqueue = <value optimized out>
        object = <value optimized out>
        class = 0x20a9df0
        unref_class = 0x20a9df0
        slist = <value optimized out>
        n_total_cparams = 0
        n_cparams = 0
        n_oparams = <value optimized out>
        n_cvalues = <value optimized out>
        clist = 0x0
        newly_constructed = <value optimized out>
        i = 0
        __PRETTY_FUNCTION__ = "IA__g_object_newv"
#6  0x00007f94d890f325 in IA__g_object_new_valist (object_type=35248032, 
    first_property_name=0x0, var_args=0x7fff170f5cb0)
    at /build/buildd/glib2.0-2.21.4/gobject/gobject.c:1278
        params = <value optimized out>
        name = <value optimized out>
        object = <value optimized out>
        n_params = <value optimized out>
        n_alloced_params = 0
        __PRETTY_FUNCTION__ = "IA__g_object_new_valist"
#7  0x00007f94d890f47c in IA__g_object_new (object_type=35248032, 
    first_property_name=0x0)
    at /build/buildd/glib2.0-2.21.4/gobject/gobject.c:1060
        var_args = {{gp_offset = 16, fp_offset = 48, 
            overflow_arg_area = 0x7fff170f5da0, 
            reg_save_area = 0x7fff170f5cd0}}
        __PRETTY_FUNCTION__ = "IA__g_object_new"
#8  0x00007f94ce3f4449 in brasero_medium_monitor_get_default ()
    at brasero-medium-monitor.c:825
No locals.
#9  0x00007f94ce3f385f in brasero_media_library_start ()
    at brasero-media.c:532
No locals.
#10 0x00007f94ce8923d9 in nautilus_module_initialize (module=0x20a1180)
    at nautilus-burn-extension.c:932
No locals.
#11 0x00000000004f2236 in nautilus_module_load (gmodule=0x22644c0)
    at nautilus-module.c:96
No locals.
#12 0x00007f94d892b524 in IA__g_type_module_use (module=0x22644c0)
    at /build/buildd/glib2.0-2.21.4/gobject/gtypemodule.c:257
        tmp_list = <value optimized out>
        __PRETTY_FUNCTION__ = "IA__g_type_module_use"
#13 0x00000000004f2348 in nautilus_module_load_file ()
    at nautilus-module.c:173
No locals.
#14 load_module_dir () at nautilus-module.c:200
        filename = 0x2272650 "/usr/lib/nautilus/extensions-2.0/libnautilus-brasero-extension.so"
        name = <value optimized out>
        dir = <value optimized out>
#15 nautilus_module_setup () at nautilus-module.c:230
        initialized = 1
#16 0x000000000043377d in finish_startup (application=0x1fc3f70, 
    kill_shell=<value optimized out>, no_default_window=1, no_desktop=0, 
    browser_window=0, geometry=0x0, urls=0x0) at nautilus-application.c:649
        drives = <value optimized out>
#17 nautilus_application_startup (application=0x1fc3f70, 
    kill_shell=<value optimized out>, no_default_window=1, no_desktop=0, 
    browser_window=0, geometry=0x0, urls=0x0) at nautilus-application.c:885
        accel_map_filename = <value optimized out>
        message = <value optimized out>
#18 0x0000000000443342 in main (argc=1, argv=0x7fff170f6288)
    at nautilus-main.c:534
        kill_shell = 0
        no_default_window = 1
        browser_window = 0
        no_desktop = 0
        version = 0
        autostart_mode = 1
        autostart_id = <value optimized out>
        geometry = 0x0
        remaining = 0x0
        perform_self_check = 0
        application = <value optimized out>
        context = <value optimized out>
        file = 0x1
        uri = <value optimized out>
        uris = 0x0
        uris_array = <value optimized out>
        error = 0x0
        options = {{long_name = 0x54a4f9 "check", short_name = 99 'c', 
            flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7fff170f6178, 
            description = 0x54a540 "Perform a quick set of self-check tests.", arg_description = 0x0}, {long_name = 0x54a42f "version", short_name = 0 '\0', 
            flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7fff170f617c, 
            description = 0x54a570 "Show the version of the program.", 
            arg_description = 0x0}, {long_name = 0x54e413 "geometry", 
            short_name = 103 'g', flags = 0, arg = G_OPTION_ARG_STRING, 
            arg_data = 0x7fff170f6170, 
            description = 0x54a598 "Create the initial window with the given geometry.", arg_description = 0x54a437 "GEOMETRY"}, {
            long_name = 0x54a440 "no-default-window", short_name = 110 'n', 
            flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7fff170f6188, 
            description = 0x54a5d0 "Only create windows for explicitly specified URIs.", arg_description = 0x0}, {long_name = 0x54a452 "no-desktop", 
            short_name = 0 '\0', flags = 0, arg = G_OPTION_ARG_NONE, 
            arg_data = 0x7fff170f6180, 
            description = 0x54a608 "Do not manage the desktop (ignore the preference set in the preferences dialog).", arg_description = 0x0}, {
            long_name = 0x546e06 "browser", short_name = 0 '\0', flags = 0, 
            arg = G_OPTION_ARG_NONE, arg_data = 0x7fff170f6184, 
            description = 0x54a45d "open a browser window.", 
            arg_description = 0x0}, {long_name = 0x56b7b1 "quit", 
            short_name = 113 'q', flags = 0, arg = G_OPTION_ARG_NONE, 
            arg_data = 0x7fff170f618c, 
            description = 0x54a474 "Quit Nautilus.", arg_description = 0x0}, {
            long_name = 0x54f861 "", short_name = 0 '\0', flags = 0, 
            arg = G_OPTION_ARG_STRING_ARRAY, arg_data = 0x7fff170f6168, 
            description = 0x0, arg_description = 0x54a483 "[URI...]"}, {
            long_name = 0x0, short_name = 0 '\0', flags = 0, 
            arg = G_OPTION_ARG_NONE, arg_data = 0x0, description = 0x0, 
            arg_description = 0x0}}