.
Thread 4 (Thread 0x7f3cb7dc7700 (LWP 16656)):
#0  0x00007f3cc0845b03 in poll () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f3cc0b64036 in g_main_context_poll (n_fds=3, fds=0x7f3ca80010c0, timeout=-1, context=0x7f3cb000e400, priority=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3440
        poll_func = 0x7f3cc0b70f40 <g_poll>
#2  g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x7f3cb000e400, self=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3141
        timeout = -1
        some_ready = <optimized out>
        fds = 0x7f3ca80010c0
        max_priority = 2147483647
        nfds = 3
        allocated_nfds = <optimized out>
#3  g_main_context_iterate (context=0x7f3cb000e400, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3083
        some_ready = -1476390720
#4  0x00007f3cc0b6449a in g_main_loop_run (loop=0x7f3cb000e3b0) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3340
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#5  0x00007f3cc1a5e406 in gdbus_shared_thread_func (user_data=<optimized out>) at /build/buildd/glib2.0-2.32.3/./gio/gdbusprivate.c:277
        data = 0x7f3cb000e3d0
#6  0x00007f3cc0b859e5 in g_thread_proxy (data=0x7f3cb000b800) at /build/buildd/glib2.0-2.32.3/./glib/gthread.c:801
        thread = 0x7f3cb000b800
#7  0x00007f3cbdbf8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#8  0x00007f3cc08514bd in clone () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#9  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 3 (Thread 0x7f3cafbd1700 (LWP 19093)):
#0  0x00007f3cc0845b03 in poll () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f3cadeab35f in ?? () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
No symbol table info available.
#2  0x00007f3cade9c76c in pa_mainloop_poll () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
No symbol table info available.
#3  0x00007f3cade9cdd9 in pa_mainloop_iterate () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
No symbol table info available.
#4  0x00007f3cade9ce90 in pa_mainloop_run () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
No symbol table info available.
#5  0x00007f3cadeab30f in ?? () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
No symbol table info available.
#6  0x00007f3cada54d18 in ?? () from /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so
No symbol table info available.
#7  0x00007f3cbdbf8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#8  0x00007f3cc08514bd in clone () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#9  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (Thread 0x7f3cb85c8700 (LWP 16655)):
#0  0x00007f3cc0845b03 in poll () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f3cc0b64036 in g_main_context_poll (n_fds=1, fds=0x7f3cb00010e0, timeout=-1, context=0x1988390, priority=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3440
        poll_func = 0x7f3cc0b70f40 <g_poll>
#2  g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x1988390, self=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3141
        timeout = -1
        some_ready = <optimized out>
        fds = 0x7f3cb00010e0
        max_priority = 2147483647
        nfds = 1
        allocated_nfds = <optimized out>
#3  g_main_context_iterate (context=0x1988390, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3083
        some_ready = -1342172960
#4  0x00007f3cc0b6449a in g_main_loop_run (loop=0x7f3cb00010c0) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3340
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#5  0x00007f3cb85cd98b in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
No symbol table info available.
#6  0x00007f3cc0b859e5 in g_thread_proxy (data=0x196f400) at /build/buildd/glib2.0-2.32.3/./glib/gthread.c:801
        thread = 0x196f400
#7  0x00007f3cbdbf8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#8  0x00007f3cc08514bd in clone () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#9  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (Thread 0x7f3cc38b3980 (LWP 16653)):
#0  0x00007f3cc0795445 in raise () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f3cc0798bab in abort () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#2  0x00007f3cc0b83f9d in g_assertion_message (domain=<optimized out>, file=<optimized out>, line=<optimized out>, func=0x7f3cc109c900 "gee_linked_list_real_get", message=0x1ce2fd0 "assertion failed: (_tmp1_ < _tmp2_)") at /build/buildd/glib2.0-2.32.3/./glib/gtestutils.c:1861
        lstr = "679\000\377\177\000\000 \342\242\332\377\177\000\000\350\003\000\000\000\000\000\000\\\252\t\301<\177\000"
        s = 0x1ce2e90 ""
#3  0x00007f3cc0b844c2 in g_assertion_message_expr (domain=0x0, file=0x7f3cc109c6df "linkedlist.c", line=679, func=0x7f3cc109c900 "gee_linked_list_real_get", expr=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gtestutils.c:1872
        s = <optimized out>
#4  0x00007f3cc107ba11 in ?? () from /usr/lib/x86_64-linux-gnu/libgee.so.2
No symbol table info available.
#5  0x000000000040d574 in ?? ()
No symbol table info available.
#6  0x000000000040d8bb in ?? ()
No symbol table info available.
#7  0x00007f3cc34445af in ?? () from /usr/lib/libmutter.so.0
No symbol table info available.
#8  0x00007f3cc3444a13 in meta_plugin_manager_event_simple () from /usr/lib/libmutter.so.0
No symbol table info available.
#9  0x00007f3cc344906f in ?? () from /usr/lib/libmutter.so.0
No symbol table info available.
#10 0x00007f3cc3449f13 in meta_window_actor_show () from /usr/lib/libmutter.so.0
No symbol table info available.
#11 0x00007f3cc347be6f in ?? () from /usr/lib/libmutter.so.0
No symbol table info available.
#12 0x00007f3cc347cc9e in ?? () from /usr/lib/libmutter.so.0
No symbol table info available.
#13 0x00007f3cc3471318 in ?? () from /usr/lib/libmutter.so.0
No symbol table info available.
#14 0x00007f3cc2d1278c in _clutter_run_repaint_functions (flags=CLUTTER_REPAINT_FLAGS_PRE_PAINT) at ./clutter-main.c:3538
        res = 0
        context = 0x1969a80
        repaint_func = 0x1e46e40
        invoke_list = 0x0
        reinvoke_list = <optimized out>
        l = 0x1ad54c0
#15 0x00007f3cc2d14682 in master_clock_update_stages (stages=0x1b511a0, master_clock=0x1e93e30) at ./clutter-master-clock.c:369
        stages_updated = 0
        l = <optimized out>
        start = 23951813789
#16 clutter_clock_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at ./clutter-master-clock.c:519
        clock_source = <optimized out>
        master_clock = 0x1e93e30
        stage_manager = <optimized out>
        stages_updated = 0
        stages = 0x1b511a0
#17 0x00007f3cc0b63d53 in g_main_dispatch (context=0x197c4f0) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:2539
        dispatch = 0x7f3cc2d14500 <clutter_clock_dispatch>
        was_in_call = 0
        user_data = 0x0
        callback = 0
        cb_funcs = 0x0
        cb_data = 0x0
        current_source_link = {data = 0x1ac87e0, next = 0x0}
        need_destroy = <optimized out>
        source = 0x1ac87e0
        current = 0x1e932b0
        i = <optimized out>
#18 g_main_context_dispatch (context=0x197c4f0) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3075
No locals.
#19 0x00007f3cc0b640a0 in g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x197c4f0, self=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3146
        timeout = 0
        some_ready = 1
        fds = <optimized out>
        max_priority = 150
        nfds = 6
        allocated_nfds = <optimized out>
#20 g_main_context_iterate (context=0x197c4f0, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3083
        some_ready = 1
#21 0x00007f3cc0b6449a in g_main_loop_run (loop=0x197d7c0) at /build/buildd/glib2.0-2.32.3/./glib/gmain.c:3340
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#22 0x00007f3cc34624b1 in meta_run () from /usr/lib/libmutter.so.0
No symbol table info available.
#23 0x0000000000410027 in gala_main ()
No symbol table info available.
#24 0x0000000000410062 in main ()
No symbol table info available.