.
Thread 5 (Thread 0x7fb313610700 (LWP 2597)):
#0  0x00007fb31bebf031 in poll () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007fb31c093566 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x55fb639faca0, timeout=<optimized out>, context=0x55fb639dfea0) at ../../../glib/gmain.c:4230
        ret = <optimized out>
        errsv = <optimized out>
        poll_func = 0x7fb31c0a3200 <g_poll>
        poll_func = <optimized out>
        ret = <optimized out>
        errsv = <optimized out>
#2  g_main_context_iterate (context=context@entry=0x55fb639dfea0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:3926
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x55fb639faca0
#3  0x00007fb31c093690 in g_main_context_iteration (context=context@entry=0x55fb639dfea0, may_block=may_block@entry=1) at ../../../glib/gmain.c:3992
        retval = <optimized out>
#4  0x00007fb318999e5d in dconf_gdbus_worker_thread (user_data=0x55fb639dfea0) at ../gdbus/dconf-gdbus-thread.c:82
        context = 0x55fb639dfea0
#5  0x00007fb31c0bd091 in g_thread_proxy (data=0x55fb639cf590) at ../../../glib/gthread.c:805
        thread = 0x55fb639cf590
        __FUNCTION__ = "g_thread_proxy"
        _g_boolean_var_ = <optimized out>
#6  0x00007fb31bd1d75a in start_thread () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#7  0x00007fb31becb9f3 in clone () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
.
Thread 4 (Thread 0x7fb313fff700 (LWP 2596)):
#0  0x00007fb31bebf031 in poll () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007fb31c093566 in g_main_context_poll (priority=<optimized out>, n_fds=2, fds=0x55fb63a01800, timeout=<optimized out>, context=0x55fb639ff770) at ../../../glib/gmain.c:4230
        ret = <optimized out>
        errsv = <optimized out>
        poll_func = 0x7fb31c0a3200 <g_poll>
        poll_func = <optimized out>
        ret = <optimized out>
        errsv = <optimized out>
#2  g_main_context_iterate (context=0x55fb639ff770, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:3926
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 2
        allocated_nfds = 2
        fds = 0x55fb63a01800
#3  0x00007fb31c0938e2 in g_main_loop_run (loop=0x55fb639ff860) at ../../../glib/gmain.c:4125
        self = <optimized out>
        __FUNCTION__ = "g_main_loop_run"
#4  0x00007fb31b25695a in gdbus_shared_thread_func (user_data=0x55fb63a01ee0) at ../../../gio/gdbusprivate.c:279
        data = 0x55fb63a01ee0
#5  0x00007fb31c0bd091 in g_thread_proxy (data=0x55fb639cf5e0) at ../../../glib/gthread.c:805
        thread = 0x55fb639cf5e0
        __FUNCTION__ = "g_thread_proxy"
        _g_boolean_var_ = <optimized out>
#6  0x00007fb31bd1d75a in start_thread () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#7  0x00007fb31becb9f3 in clone () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
.
Thread 3 (Thread 0x7fb312e0f700 (LWP 8212)):
#0  0x00007fb31bebf031 in poll () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007fb303fe01c6 in poll_func () from /tmp/apport_sandbox_onncvo9h/usr/lib/x86_64-linux-gnu/libpulse.so.0.21.0
No symbol table info available.
#2  0x00007fb303fd1831 in pa_mainloop_poll () from /tmp/apport_sandbox_onncvo9h/usr/lib/x86_64-linux-gnu/libpulse.so.0.21.0
No symbol table info available.
#3  0x00007fb303fd1eb3 in pa_mainloop_iterate () from /tmp/apport_sandbox_onncvo9h/usr/lib/x86_64-linux-gnu/libpulse.so.0.21.0
No symbol table info available.
#4  0x00007fb303fd1f60 in pa_mainloop_run () from /tmp/apport_sandbox_onncvo9h/usr/lib/x86_64-linux-gnu/libpulse.so.0.21.0
No symbol table info available.
#5  0x00007fb303fe010d in thread () from /tmp/apport_sandbox_onncvo9h/usr/lib/x86_64-linux-gnu/libpulse.so.0.21.0
No symbol table info available.
#6  0x00007fb303f7e36c in internal_thread_func () from /tmp/apport_sandbox_onncvo9h/usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-12.99.so
No symbol table info available.
#7  0x00007fb31bd1d75a in start_thread () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#8  0x00007fb31becb9f3 in clone () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
.
Thread 2 (Thread 0x7fb318896700 (LWP 2595)):
#0  0x00007fb31bebf031 in poll () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007fb31c093566 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x55fb639ec8a0, timeout=<optimized out>, context=0x55fb639ed230) at ../../../glib/gmain.c:4230
        ret = <optimized out>
        errsv = <optimized out>
        poll_func = 0x7fb31c0a3200 <g_poll>
        poll_func = <optimized out>
        ret = <optimized out>
        errsv = <optimized out>
#2  g_main_context_iterate (context=context@entry=0x55fb639ed230, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:3926
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x55fb639ec8a0
#3  0x00007fb31c093690 in g_main_context_iteration (context=0x55fb639ed230, may_block=may_block@entry=1) at ../../../glib/gmain.c:3992
        retval = <optimized out>
#4  0x00007fb31c0936e1 in glib_worker_main (data=<optimized out>) at ../../../glib/gmain.c:5870
No locals.
#5  0x00007fb31c0bd091 in g_thread_proxy (data=0x55fb639cf540) at ../../../glib/gthread.c:805
        thread = 0x55fb639cf540
        __FUNCTION__ = "g_thread_proxy"
        _g_boolean_var_ = <optimized out>
#6  0x00007fb31bd1d75a in start_thread () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#7  0x00007fb31becb9f3 in clone () from /tmp/apport_sandbox_onncvo9h/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
.
Thread 1 (Thread 0x7fb319500a80 (LWP 2593)):
#0  0x00007fb31bfc8dc1 in meta_display_list_windows (display=0x0) at core/display.c:823
        winlist = 0x0
        tmp = <optimized out>
        prev = <optimized out>
#1  0x00007fb31bfca82d in meta_display_queue_retheme_all_windows (display=<optimized out>) at core/display.c:4164
        windows = <optimized out>
        tmp = <optimized out>
#2  0x00007fb31bfdddfc in emit_changed (pref=META_PREF_THEME) at core/prefs.c:840
        l = <optimized out>
        tmp = 0x55fb63fc23a0
        copy = 0x55fb63fc23a0
        tmp = <optimized out>
        copy = <optimized out>
        l = <optimized out>
#3  changed_idle_handler (data=<optimized out>) at core/prefs.c:866
        pref = META_PREF_THEME
        tmp = 0x55fb63ea6720
        copy = 0x55fb63ea6720
#4  0x00007fb31c093208 in g_main_dispatch (context=0x55fb6399da00) at ../../../glib/gmain.c:3193
        dispatch = 0x7fb31c08fa40 <g_idle_dispatch>
        prev_source = 0x0
        was_in_call = 0
        user_data = 0x0
        callback = 0x7fb31bfddd60 <changed_idle_handler>
        cb_funcs = <optimized out>
        cb_data = 0x55fb63c42d20
        need_destroy = <optimized out>
        source = 0x55fb63b52790
        current = 0x55fb639f4110
        i = 0
        current = <optimized out>
        i = <optimized out>
        __FUNCTION__ = "g_main_dispatch"
        source = <optimized out>
        _g_boolean_var_ = <optimized out>
        was_in_call = <optimized out>
        user_data = <optimized out>
        callback = <optimized out>
        cb_funcs = <optimized out>
        cb_data = <optimized out>
        need_destroy = <optimized out>
        dispatch = <optimized out>
        prev_source = <optimized out>
        _g_boolean_var_ = <optimized out>
#5  g_main_context_dispatch (context=context@entry=0x55fb6399da00) at ../../../glib/gmain.c:3858
No locals.
#6  0x00007fb31c0935f8 in g_main_context_iterate (context=0x55fb6399da00, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:3931
        max_priority = 210
        timeout = 0
        some_ready = 1
        nfds = <optimized out>
        allocated_nfds = 5
        fds = 0x55fb63afde10
#7  0x00007fb31c0938e2 in g_main_loop_run (loop=0x55fb6399e000) at ../../../glib/gmain.c:4125
        self = <optimized out>
        __FUNCTION__ = "g_main_loop_run"
#8  0x000055fb61d8b26c in main (argc=<optimized out>, argv=<optimized out>) at core/main.c:576
        act = {__sigaction_handler = {sa_handler = 0x55fb61d8b770 <sigterm_handler>, sa_sigaction = 0x55fb61d8b770 <sigterm_handler>}, sa_mask = {__val = {0 <repeats 16 times>}}, sa_flags = 0, sa_restorer = 0x7fb319d953eb}
        empty_mask = {__val = {0 <repeats 16 times>}}
        meta_args = {save_file = 0x0, display_name = 0x0, client_id = 0x55fb63aee320 "\035\b", replace_wm = 0, disable_sm = 0, print_version = <optimized out>, sync = <optimized out>, composite = <optimized out>, no_composite = <optimized out>, no_force_fullscreen = <optimized out>}
        log_domains = {0x7fb319505cf8 "\230h\331\031\263\177", 0x55fb61d8c016 "marco", 0x55fb61d8c01c "Gtk", 0x55fb61d8c020 "Gdk", 0x55fb61d8c024 "GLib", 0x55fb61d8c029 "Pango", 0x55fb61d8c02f "GLib-GObject", 0x55fb61d8c03c "GThread"}
        i = <optimized out>
        channel = <optimized out>