#0  0x00007f18102c3f77 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 1449
        selftid = 1449
#1  0x00007f18102c75e8 in __GI_abort () at abort.c:90
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7f18111d3460, sa_sigaction = 0x7f18111d3460}, sa_mask = {__val = {31645620, 139741345485728, 139741351529589, 214748364805, 0, 4294967296, 139741327080680, 31651632, 139741345485728, 140, 139741351556869, 161, 51, 139741330986904, 0, 0}}, sa_flags = 0, sa_restorer = 0x20}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f181116ffcd in _g_log_abort () at /build/buildd/glib2.0-2.38.0/./glib/gmessages.c:255
No locals.
#3  0x00007f181118d3a7 in g_assertion_message (domain=domain@entry=0x7f18111ac5ae "GLib", file=file@entry=0x7f18111d3460 "/build/buildd/glib2.0-2.38.0/./glib/gutf8.c", line=line@entry=1736, func=func@entry=0x7f18111d34a0 <__FUNCTION__.6148> "_g_utf8_make_valid", message=message@entry=0x1e2e1e0 "assertion failed: (g_utf8_validate (string->str, -1, NULL))") at /build/buildd/glib2.0-2.38.0/./glib/gtestutils.c:2278
        lstr = "1736\000\177\000\000\220\065\361\346\377\177\000\000\264\337\342\001\000\000\000\000\070\064\035\021\030\177\000"
        s = 0x1e2f730 "\230\327d\020\030\177"
#4  0x00007f181118d40a in g_assertion_message_expr (domain=domain@entry=0x7f18111ac5ae "GLib", file=file@entry=0x7f18111d3460 "/build/buildd/glib2.0-2.38.0/./glib/gutf8.c", line=line@entry=1736, func=func@entry=0x7f18111d34a0 <__FUNCTION__.6148> "_g_utf8_make_valid", expr=expr@entry=0x7f18111d3438 "g_utf8_validate (string->str, -1, NULL)") at /build/buildd/glib2.0-2.38.0/./glib/gtestutils.c:2293
        s = 0x1e2e1e0 "assertion failed: (g_utf8_validate (string->str, -1, NULL))"
#5  0x00007f18111973ee in _g_utf8_make_valid (name=name@entry=0x1e2dfb0 "\327\357\277\275\357\277\275\357\277\275\357\277\275\357\277\275") at /build/buildd/glib2.0-2.38.0/./glib/gutf8.c:1736
        string = 0x1e1d6e0
        remainder = 0x1e2dfb4 "\357\277\275\357\277\275\357\277\275\357\277\275"
        invalid = 0x1e2dfb3 "\275\357\277\275\357\277\275\357\277\275\357\277\275"
        remaining_bytes = <optimized out>
        valid_bytes = <optimized out>
        __PRETTY_FUNCTION__ = "_g_utf8_make_valid"
        __FUNCTION__ = "_g_utf8_make_valid"
#6  0x00007f181114e6a0 in g_filename_display_name (filename=filename@entry=0x1e2dfb0 "\327\357\277\275\357\277\275\357\277\275\357\277\275\357\277\275") at /build/buildd/glib2.0-2.38.0/./glib/gconvert.c:1947
        i = <optimized out>
        charsets = 0x1e22450
        display_name = 0x0
        is_utf8 = <optimized out>
#7  0x00007f1811156e7c in get_contents_posix (error=0x0, length=0x0, contents=0x7fffe6f137a8, filename=0x1e2dfb0 "\327\357\277\275\357\277\275\357\277\275\357\277\275\357\277\275") at /build/buildd/glib2.0-2.38.0/./glib/gfileutils.c:822
        stat_buf = {st_dev = 140737067956128, st_ino = 6481600, st_nlink = 0, st_mode = 0, st_uid = 0, st_gid = 0, __pad0 = 0, st_rdev = 31654256, st_size = 31645616, st_blksize = 139741351529589, st_blocks = 5, st_atim = {tv_sec = 0, tv_nsec = 4328507}, st_mtim = {tv_sec = 139741342386088, tv_nsec = 0}, st_ctim = {tv_sec = 31645616, tv_nsec = 1}, __unused = {139741351556869, 31660080, 0}}
        display_filename = <optimized out>
#8  g_file_get_contents (filename=filename@entry=0x1e2dfb0 "\327\357\277\275\357\277\275\357\277\275\357\277\275\357\277\275", contents=contents@entry=0x7fffe6f137a8, length=length@entry=0x0, error=error@entry=0x0) at /build/buildd/glib2.0-2.38.0/./glib/gfileutils.c:974
        __PRETTY_FUNCTION__ = "g_file_get_contents"
#9  0x000000000041b479 in display_number_in_use (display_number=0) at x-server-local.c:106
        link = <optimized out>
        path = 0x1e2dfb0 "\327\357\277\275\357\277\275\357\277\275\357\277\275\357\277\275"
        exists = 1
        data = 0x0
#10 x_server_local_get_unused_display_number () at x-server-local.c:128
        number = 0
#11 0x000000000041be07 in x_server_local_new () at x-server-local.c:157
        self = 0x1e310f0
        hostname = '\000' <repeats 16 times>, "\006\000\000\000\000\000\000\000\211\376\026\021\030\177\000\000`\343\342\001", '\000' <repeats 12 times>"\350, \063\000\000\000\000\000\000\001\000\000\000\000\000\000\000\323N\315\345\006C]?\000\000\000\000\000\000\000\000", '%' <repeats 16 times>, '\000' <repeats 18 times>"\377, \377\377\377\377\377\377\377\377\377\377\377\377\377\000\000\000\000tdm-\000\004\340\220\347\fY\177^\000\000\000\b\000\000\000\220\373\341\001\000\000\000\000`\343\342\001\000\000\000\000\200", '\000' <repeats 23 times>, "\006\000\000\000\000\000\000\000\273\314@\000\000\000\000\000\200", '\000' <repeats 23 times>, "`\343\342\001\000\000\000\000\200", '\000' <repeats 23 times>"\227, \003\027\021\030\177\000\000\277BB\000\000\000\000\000(;\361\346\200\000\000\000\000\314@", '\000' <repeats 13 times>, "\001", '\000' <repeats 15 times>...
        number = <optimized out>
        name = <optimized out>
#12 0x00000000004153af in seat_xlocal_create_display_server (seat=0x1e29980, session_type=0x5a9 <Address 0x5a9 out of bounds>) at seat-xlocal.c:76
        x_server = 0x1e2e4c0
        command = 0x5a9 <Address 0x5a9 out of bounds>
        layout = 0x0
        config_file = 0x0
        xdmcp_manager = 0x0
        key_name = 0x0
        xdg_seat = 0x0
        allow_tcp = 0
        vt = 0
        port = 0
#13 0x000000000040f580 in create_display_server (seat=seat@entry=0x1e29980, session_type=0x1e2e4c0 "x") at seat.c:1180
        display_server = <optimized out>
#14 0x0000000000411c7c in seat_real_start (seat=0x1e29980) at seat.c:1538
        greeter_session = <optimized out>
        display_server = <optimized out>
        autologin_guest = 0
        autologin_in_background = <optimized out>
        autologin_username = 0x0
        autologin_timeout = <optimized out>
        session = 0x1e30170
        background_session = 0x0
        seat = 0x1e29980
#15 0x00000000004090ed in display_manager_add_seat (manager=0x1e1dd30, seat=seat@entry=0x1e29980) at display-manager.c:94
        result = <optimized out>
        __PRETTY_FUNCTION__ = "display_manager_add_seat"
#16 0x000000000040707a in main (argc=2, argv=0x7fffe6f14028) at lightdm.c:1247
        type = 0x1e2db70 "true"
        seat = 0x1e29980
        pid_file = <optimized out>
        option_context = <optimized out>
        result = <optimized out>
        groups = 0x1e2db30
        i = <optimized out>
        dir = <optimized out>
        n_seats = <optimized out>
        explicit_config = 0
        test_mode = 0
        pid_path = 0x422540 "/var/run/lightdm.pid"
        config_dir = <optimized out>
        config_d_dir = <optimized out>
        log_dir = 0x0
        run_dir = 0x0
        cache_dir = 0x0
        default_log_dir = <optimized out>
        default_run_dir = 0x1e1cf50 "cache-directory"
        default_cache_dir = 0x1e1cf70 "sessions-directory"
        show_version = 0
        link = <optimized out>
        messages = 0x1e1d240
        options = {{long_name = 0x423f6d "config", short_name = 99 'c', flags = 0, arg = G_OPTION_ARG_STRING, arg_data = 0x62ea68 <config_path>, description = 0x42258a "Use configuration file", arg_description = 0x422c41 "FILE"}, {long_name = 0x4225a1 "debug", short_name = 100 'd', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x62ea50 <debug>, description = 0x4225a7 "Print debugging messages", arg_description = 0x0}, {long_name = 0x4225c0 "test-mode", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7fffe6f13d28, description = 0x421e78 "Run as unprivileged user, skipping things that require root access", arg_description = 0x0}, {long_name = 0x4225ca "pid-file", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_STRING, arg_data = 0x7fffe6f13d30, description = 0x4225d3 "File to write PID into", arg_description = 0x422c41 "FILE"}, {long_name = 0x4225ea "log-dir", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_STRING, arg_data = 0x7fffe6f13d38, description = 0x4225f2 "Directory to write logs to", arg_description = 0x42260d "DIRECTORY"}, {long_name = 0x422617 "run-dir", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_STRING, arg_data = 0x7fffe6f13d40, description = 0x421ec0 "Directory to store running state", arg_description = 0x42260d "DIRECTORY"}, {long_name = 0x42261f "cache-dir", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_STRING, arg_data = 0x7fffe6f13d48, description = 0x421ee8 "Directory to cache information", arg_description = 0x42260d "DIRECTORY"}, {long_name = 0x422636 "version", short_name = 118 'v', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7fffe6f13d2c, description = 0x422629 "Show release version", arg_description = 0x0}, {long_name = 0x0, short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x0, description = 0x0, arg_description = 0x0}}
        error = 0x0