.
Thread 3 (Thread 0x7f5e5c092700 (LWP 1036)):
#0  0x00007f5e60c1810d in poll () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007f5e61a90576 in ?? () from /tmp/apport_sandbox_Ybwgbu/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007f5e61a90902 in g_main_loop_run () from /tmp/apport_sandbox_Ybwgbu/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007f5e62077456 in ?? () from /tmp/apport_sandbox_Ybwgbu/usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#4  0x00007f5e61ab7f65 in ?? () from /tmp/apport_sandbox_Ybwgbu/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007f5e60eea6ca in start_thread (arg=0x7f5e5c092700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f5e5c092700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140043247757056, 9208384888956269516, 0, 140725610246191, 140043247757760, 140043247757056, -9117966982899026996, -9118099734269381684}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007f5e60c240ff in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
No locals.
.
Thread 2 (Thread 0x7f5e5c893700 (LWP 1035)):
#0  0x00007f5e60c1810d in poll () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007f5e61a90576 in ?? () from /tmp/apport_sandbox_Ybwgbu/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#2  0x00007f5e61a9068c in g_main_context_iteration () from /tmp/apport_sandbox_Ybwgbu/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007f5e61a906d1 in ?? () from /tmp/apport_sandbox_Ybwgbu/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4  0x00007f5e61ab7f65 in ?? () from /tmp/apport_sandbox_Ybwgbu/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5  0x00007f5e60eea6ca in start_thread (arg=0x7f5e5c893700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f5e5c893700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140043256149760, 9208384888956269516, 0, 140725610245839, 140043256150464, 140043256149760, -9117968080800042036, -9118099734269381684}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007f5e60c240ff in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
No locals.
.
Thread 1 (Thread 0x7f5e62538880 (LWP 1032)):
#0  _dl_fini () at dl-fini.c:231
        array = <optimized out>
        i = <optimized out>
        l = 0x55eb13fedb40
        maps = 0x7ffd3c026a10
        i = 17
        l = <optimized out>
        nmaps = 45
        nloaded = <optimized out>
        ns = 0
        do_audit = <optimized out>
        __PRETTY_FUNCTION__ = "_dl_fini"
#1  0x00007f5e60b562e0 in __run_exit_handlers (status=status@entry=0, listp=0x7f5e60edd5d8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at exit.c:83
        atfct = <optimized out>
        onfct = <optimized out>
        cxafct = <optimized out>
        f = <optimized out>
#2  0x00007f5e60b5633a in __GI_exit (status=status@entry=0) at exit.c:105
No locals.
#3  0x000055eb12ae2b7c in signal_cb (signum=<optimized out>) at session-child.c:175
No locals.
#4  <signal handler called>
No locals.
#5  0x00007f5e6235d5c7 in munmap () at ../sysdeps/unix/syscall-template.S:84
No locals.
#6  0x00007f5e6235b03d in _dl_unmap_segments (l=l@entry=0x55eb13fedb40) at ./dl-unmap-segments.h:32
No locals.
#7  _dl_unmap (map=map@entry=0x55eb13fedb40) at ../sysdeps/x86_64/tlsdesc.c:140
No locals.
#8  0x00007f5e6235876c in _dl_close_worker (map=map@entry=0x55eb13fedb40, force=force@entry=false) at dl-close.c:678
        lnp = <optimized out>
        i = <optimized out>
        nsid = <optimized out>
        any_tls = false
        nloaded = <optimized out>
        used = <optimized out>
        done = <optimized out>
        maps = 0x7ffd3c027120
        idx = <optimized out>
        done_index = <optimized out>
        do_audit = <optimized out>
        unload_any = true
        scope_mem_left = false
        unload_global = 0
        first_loaded = <optimized out>
        r = 0x7f5e62568140 <_r_debug>
        tls_free_start = 0
        tls_free_end = 0
        dl_close_state = pending
#9  0x00007f5e6235928a in _dl_close_worker (force=false, map=0x55eb13fedb40) at dl-close.c:125
        dl_close_state = pending
#10 _dl_close (_map=0x55eb13fedb40) at dl-close.c:822
        map = 0x55eb13fedb40
        __PRETTY_FUNCTION__ = "_dl_close"
#11 0x00007f5e62352674 in _dl_catch_error (objname=0x55eb13feb7a0, errstring=0x55eb13feb7a8, mallocedp=0x55eb13feb798, operate=0x7f5e5f3affb0 <dlclose_doit>, args=0x55eb13fedb40) at dl-error.c:187
        errcode = 32606
        c = {objname = 0x55eb13feb7a0, errstring = 0x55eb13feb7a8, malloced = 0x55eb13feb798, errcode = 0x7ffd3c02741c, env = {{__jmpbuf = {0, -9117960545890192436, 94468141144896, 94468141132816, 1000, 94468141211248, -9209657552052145204, -9118094696251247668}, __mask_was_saved = 1684300064, __saved_mask = {__val = {7809644627923985780, 8027701668024185960, 4556909918429279347, 3418922014266768741, 7451606009432859251, 140725610247424, 0, 0, 94468141161888, 94468141135040, 1, 94468141132816, 1000, 0, 140043329943040, 94468141143456}}}}}
        catchp = 0x7f5e62538878
        old = <optimized out>
#12 0x00007f5e5f3b0571 in _dlerror_run (operate=operate@entry=0x7f5e5f3affb0 <dlclose_doit>, args=0x55eb13fedb40) at dlerror.c:163
        result = 0x55eb13feb790
#13 0x00007f5e5f3affdf in __dlclose (handle=<optimized out>) at dlclose.c:46
No locals.
#14 0x00007f5e61109335 in _pam_dlclose (handle=<optimized out>) at pam_dynamic.c:126
No locals.
#15 0x00007f5e61106cd1 in _pam_free_handlers (pamh=pamh@entry=0x55eb13feb4c0) at pam_handlers.c:986
        mod = 0x55eb13ff1da0
#16 0x00007f5e611042a1 in pam_end (pamh=0x55eb13feb4c0, pam_status=pam_status@entry=0) at pam_end.c:35
        ret = <optimized out>
#17 0x000055eb12ae398e in session_child_run (argc=<optimized out>, argv=<optimized out>) at session-child.c:833
        conversation = {conv = 0x55eb12ae2e50 <pam_conv_cb>, appdata_ptr = 0x0}
        i = <optimized out>
        version = 3
        fd = <optimized out>
        result = <optimized out>
        auth_complete = 1
        user = 0x55eb13ffde70
        log_filename = 0x55eb13ff9b20 ".xsession-errors"
        log_mode = LOG_MODE_BACKUP_AND_TRUNCATE
        env_length = 12
        command_argc = 2
        command_argv = <optimized out>
        ck_parameters = {u = {s = {partial_magic = 140043351216544, type = 0x7f5e6235020b <_dl_map_object_deps+603>, y = {140043353341640, 140043353487832, 0, 0, 140043353487832, 140043351276692, 140043353332192, 2, 140043353491200, 140725610463656, 140725610463896, 140043351278811, 2, 140725610463896}}, x = {140043351216544, 140043351294475, 140043353341640, 140043353487832, 0, 0, 140043353487832, 140043351276692, 140043353332192, 2, 140043353491200, 140725610463656, 140725610463896, 140043351278811, 2, 140725610463896}}}
        return_code = 1
        authentication_result = 0
        authentication_result_string = <optimized out>
        username = 0x55eb13feac10 "ben"
        tty = 0x55eb13feac30 "/dev/tty7"
        xdisplay = 0x55eb13feac50 ":0"
        x_authority = <optimized out>
        bus = <optimized out>
        login1_session_id = <optimized out>
        console_kit_cookie = 0x0
        locale_value = <optimized out>
        locale_var = <optimized out>
        locale_var_names = {0x55eb12af7895 "LC_PAPER", 0x55eb12af788d "LC_NAME", 0x55eb12af79c9 "LC_ADDRESS", 0x55eb12af79d4 "LC_TELEPHONE", 0x55eb12af79e1 "LC_MEASUREMENT", 0x55eb12af79f0 "LC_IDENTIFICATION", 0x55eb12af7a02 "LC_COLLATE", 0x55eb12af7a0d "LC_CTYPE", 0x55eb12af7a16 "LC_MONETARY", 0x55eb12af7a22 "LC_NUMERIC", 0x55eb12af7a2d "LC_TIME", 0x55eb12af7a35 "LC_MESSAGES", 0x55eb12af7a41 "LC_ALL", 0x55eb12af5c8d "LANG", 0x0}
        gid = <optimized out>
        uid = 1000
        home_directory = <optimized out>
        error = 0x0
#18 0x000055eb12acdd0d in main (argc=<optimized out>, argv=<optimized out>) at lightdm.c:661
        action = {__sigaction_handler = {sa_handler = 0x1, sa_sigaction = 0x1}, sa_mask = {__val = {0 <repeats 16 times>}}, sa_flags = 268435456, sa_restorer = 0x6e0000005b}
        pid_file = <optimized out>
        option_context = <optimized out>
        result = <optimized out>
        dir = <optimized out>
        test_mode = 0
        pid_path = 0x55eb12af4de9 "/var/run/lightdm.pid"
        log_dir = 0x0
        run_dir = 0x0
        cache_dir = 0x0
        default_log_dir = 0x55eb13fe8e00 "/var/log/lightdm"
        default_run_dir = 0x55eb13fe8e20 "/var/run/lightdm"
        default_cache_dir = 0x55eb13fe8e40 "/var/cache/lightdm"
        show_config = 0
        show_version = 0
        link = <optimized out>
        messages = 0x0
        options = {{long_name = 0x55eb12af69fa "config", short_name = 99 'c', flags = 0, arg = G_OPTION_ARG_STRING, arg_data = 0x55eb12d06160 <config_path>, description = 0x55eb12af4e33 "Use configuration file", arg_description = 0x55eb12af4e4a "FILE"}, {long_name = 0x55eb12af4e4f "debug", short_name = 100 'd', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x55eb12d06148 <debug>, description = 0x55eb12af4e55 "Print debugging messages", arg_description = 0x0}, {long_name = 0x55eb12af4e6e "test-mode", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7ffd3c0278b4, description = 0x55eb12af48c0 "Run as unprivileged user, skipping things that require root access", arg_description = 0x0}, {long_name = 0x55eb12af4e78 "pid-file", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_STRING, arg_data = 0x7ffd3c0278c0, description = 0x55eb12af4e81 "File to write PID into", arg_description = 0x55eb12af4e4a "FILE"}, {long_name = 0x55eb12af4e98 "log-dir", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_STRING, arg_data = 0x7ffd3c0278c8, description = 0x55eb12af4ea0 "Directory to write logs to", arg_description = 0x55eb12af4ebb "DIRECTORY"}, {long_name = 0x55eb12af4ec5 "run-dir", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_STRING, arg_data = 0x7ffd3c0278d0, description = 0x55eb12af4908 "Directory to store running state", arg_description = 0x55eb12af4ebb "DIRECTORY"}, {long_name = 0x55eb12af4ecd "cache-dir", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_STRING, arg_data = 0x7ffd3c0278d8, description = 0x55eb12af4930 "Directory to cache information", arg_description = 0x55eb12af4ebb "DIRECTORY"}, {long_name = 0x55eb12af4ed7 "show-config", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7ffd3c0278b8, description = 0x55eb12af4ee3 "Show combined configuration", arg_description = 0x0}, {long_name = 0x55eb12af4f0c "version", short_name = 118 'v', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x7ffd3c0278bc, description = 0x55eb12af4eff "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