.
Thread 3 (Thread 0x7fe6c3fff700 (LWP 1764)):
#0  0x00007fe6d7a13b03 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
        resultvar = <optimized out>
        oldtype = 0
        result = <optimized out>
#1  0x00007fe6d7f4eff6 in g_main_context_poll (n_fds=1, fds=0x7fe6bc0010e0, timeout=-1, context=0x100bd80, priority=<optimized out>) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3417
        poll_func = 0x7fe6d7f5bf10 <g_poll>
#2  g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x100bd80, self=<optimized out>) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3118
        timeout = -1
        some_ready = <optimized out>
        fds = 0x7fe6bc0010e0
        max_priority = 2147483647
        nfds = 1
        allocated_nfds = <optimized out>
#3  g_main_context_iterate (context=0x100bd80, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3060
        some_ready = -1140846368
#4  0x00007fe6d7f4f45a in g_main_loop_run (loop=0x7fe6bc0010c0) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3317
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#5  0x00007fe6d091598b in dconf_context_thread (data=<optimized out>) at dconfcontext.c:11
        context = 0x100bd80
        loop = <optimized out>
        __PRETTY_FUNCTION__ = "dconf_context_thread"
#6  0x00007fe6d7f709b5 in g_thread_proxy (data=0x7fe6cc0042d0) at /build/buildd/glib2.0-2.32.0/./glib/gthread.c:801
        thread = 0x7fe6cc0042d0
#7  0x00007fe6d7cf1e9a in start_thread (arg=0x7fe6c3fff700) at pthread_create.c:308
        __res = <optimized out>
        pd = 0x7fe6c3fff700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 852181459743510510, 140735517929456, 140629107538368, 0, 3, -856236459272728594, -856210475196641298}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#8  0x00007fe6d7a1f4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#9  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (Thread 0x7fe6d2347700 (LWP 1761)):
#0  0x00007fe6d7a13b03 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
        resultvar = <optimized out>
        oldtype = 0
        result = <optimized out>
#1  0x00007fe6d7f4eff6 in g_main_context_poll (n_fds=5, fds=0x7fe6cc002fd0, timeout=-1, context=0xfffab0, priority=<optimized out>) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3417
        poll_func = 0x7fe6d7f5bf10 <g_poll>
#2  g_main_context_iterate (dispatch=1, block=<optimized out>, context=0xfffab0, self=<optimized out>) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3118
        timeout = -1
        some_ready = <optimized out>
        fds = 0x7fe6cc002fd0
        max_priority = 2147483647
        nfds = 5
        allocated_nfds = <optimized out>
#3  g_main_context_iterate (context=0xfffab0, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3060
        some_ready = -872402992
#4  0x00007fe6d7f4f45a in g_main_loop_run (loop=0xfffa60) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3317
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#5  0x00007fe6d85142a6 in gdbus_shared_thread_func (user_data=<optimized out>) at /build/buildd/glib2.0-2.32.0/./gio/gdbusprivate.c:277
        data = 0xfffa80
#6  0x00007fe6d7f709b5 in g_thread_proxy (data=0xffe280) at /build/buildd/glib2.0-2.32.0/./glib/gthread.c:801
        thread = 0xffe280
#7  0x00007fe6d7cf1e9a in start_thread (arg=0x7fe6d2347700) at pthread_create.c:308
        __res = <optimized out>
        pd = 0x7fe6d2347700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 852181459743510510, 140735517930000, 140629345860032, 0, 3, -856199681467772946, -856210475196641298}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#8  0x00007fe6d7a1f4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#9  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (Thread 0x7fe6d963b940 (LWP 1755)):
#0  0x00007fe6d8e2bc34 in gdk_pixbuf_get_n_channels@plt () from /tmp/tmpbeqZO2/usr/lib/libgnome-desktop-3.so.2
No symbol table info available.
#1  0x00007fe6d8e310ad in pixbuf_average_value (pixbuf=0x7fe6bc002a80, result=0x7fff8a8dade0) at gnome-bg.c:2494
        average = {red = 0, green = 6.0287571183671504e-314, blue = 6.9480166441783665e-310, alpha = 2.1389717579570187e-310}
#2  0x00007fe6d8e33808 in gnome_bg_create_surface (bg=<optimized out>, window=0xfed000, width=3360, height=1080, is_root=1) at gnome-bg.c:1129
        pixbuf = 0x7fe6bc002a80
        pm_width = 3360
        pm_height = <optimized out>
        surface = 0x1452ab0
        average = {red = 4.9406564584124654e-324, green = 6.9479944536317366e-310, blue = 4.9406564584124654e-324, alpha = 3.7300709239324011e-316}
        cr = 0x7fe6d6c599e0
        __PRETTY_FUNCTION__ = "gnome_bg_create_surface"
#3  0x00007fe6b83e864c in draw_background (use_crossfade=1, manager=0x11444f0) at gsd-background-manager.c:211
        screen = 0xfe60c0
        root_window = 0xfed000
        surface = <optimized out>
        display = 0xfe0010
        n_screens = 1
        i = <optimized out>
#4  draw_background (manager=0x11444f0, use_crossfade=1) at gsd-background-manager.c:184
No locals.
#5  0x00007fe6d820beaa in _g_closure_invoke_va (closure=0x11ee040, return_value=0x0, instance=0x11df510, args=0x7fff8a8db198, n_params=0, param_types=<optimized out>) at /build/buildd/glib2.0-2.32.0/./gobject/gclosure.c:840
        marshal = 0x7fe6d820da90 <g_cclosure_marshal_VOID__VOIDv>
        marshal_data = <optimized out>
        in_marshal = 0
        real_closure = 0x11ee020
        __PRETTY_FUNCTION__ = "_g_closure_invoke_va"
#6  0x00007fe6d8224721 in g_signal_emit_valist (instance=0x11df510, signal_id=<optimized out>, detail=0, var_args=<optimized out>) at /build/buildd/glib2.0-2.32.0/./gobject/gsignal.c:3207
        return_accu = <optimized out>
        accu = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
        accumulator = 0x0
        emission = {next = 0x0, instance = 0x11df510, ihint = {signal_id = 252, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = EMISSION_RUN, chain_type = 18495360}
        signal_id = <optimized out>
        instance_type = <optimized out>
        emission_return = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
        rtype = 4
        static_scope = 0
        closure = 0x11ee040
        run_type = <optimized out>
        hlist = 0x8000
        l = <optimized out>
        fastpath = 1
        instance_and_params = <optimized out>
        signal_return_type = <optimized out>
        param_values = <optimized out>
        node = 0x13cd960
        i = <optimized out>
        n_params = <optimized out>
        __PRETTY_FUNCTION__ = "g_signal_emit_valist"
#7  0x00007fe6d8225222 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.32.0/./gobject/gsignal.c:3352
        var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7fff8a8db270, reg_save_area = 0x7fff8a8db1b0}}
#8  0x00007fe6d8e31b06 in do_changed (bg=0x11df510) at gnome-bg.c:249
No locals.
#9  do_changed (bg=0x11df510) at gnome-bg.c:239
        ignore_pending_change = <optimized out>
#10 0x00007fe6d7f4f8db in g_timeout_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3859
        timeout_source = 0x1449a50
        again = <optimized out>
#11 0x00007fe6d7f4ec9a in g_main_dispatch (context=0xfe9760) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:2515
        dispatch = 0x7fe6d7f4f8c0 <g_timeout_dispatch>
        was_in_call = 0
        user_data = 0x11df510
        callback = 0x7fe6d8e31ab0 <do_changed>
        cb_funcs = 0x7fe6d81fa9a0
        cb_data = 0x13cd910
        current_source_link = {data = 0x1449a50, next = 0x0}
        need_destroy = <optimized out>
        source = 0x1449a50
        current = 0x1000d70
        i = <optimized out>
#12 g_main_context_dispatch (context=0xfe9760) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3052
No locals.
#13 0x00007fe6d7f4f060 in g_main_context_iterate (dispatch=1, block=<optimized out>, context=0xfe9760, self=<optimized out>) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3123
        timeout = 58
        some_ready = 1
        fds = <optimized out>
        max_priority = 2147483647
        nfds = 12
        allocated_nfds = <optimized out>
#14 g_main_context_iterate (context=0xfe9760, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3060
        some_ready = 1
#15 0x00007fe6d7f4f45a in g_main_loop_run (loop=0x11d5120) at /build/buildd/glib2.0-2.32.0/./glib/gmain.c:3317
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#16 0x00007fe6d8913ecd in gtk_main () at /build/buildd/gtk+3.0-3.4.0/./gtk/gtkmain.c:1165
        loop = 0x11d5120
#17 0x0000000000403801 in main (argc=1, argv=0x7fff8a8db4d8) at main.c:464
        res = <optimized out>
        error = 0x0