.
Thread 5 (Thread 0x7f3913fff700 (LWP 1524)):
#0  0x00007f392da90c3f in poll () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f39289801c6 in poll_func () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libpulse.so.0.21.1
No symbol table info available.
#2  0x00007f3928971831 in pa_mainloop_poll () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libpulse.so.0.21.1
No symbol table info available.
#3  0x00007f3928971eb3 in pa_mainloop_iterate () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libpulse.so.0.21.1
No symbol table info available.
#4  0x00007f3928971f60 in pa_mainloop_run () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libpulse.so.0.21.1
No symbol table info available.
#5  0x00007f392898010d in thread () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libpulse.so.0.21.1
No symbol table info available.
#6  0x00007f392891e36c in internal_thread_func () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-13.0.so
No symbol table info available.
#7  0x00007f392d8ed669 in start_thread () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#8  0x00007f392da9d333 in clone () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
.
Thread 4 (Thread 0x7f3929a2a700 (LWP 1489)):
#0  0x00007f392da90c3f in poll () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f392dc690be in g_main_context_iterate.isra () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#2  0x00007f392dc691f3 in g_main_context_iteration () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#3  0x00007f392acf499d in dconf_gdbus_worker_thread (user_data=0x5607cfe630a0) at ../gdbus/dconf-gdbus-thread.c:82
        context = 0x5607cfe630a0
#4  0x00007f392dc92851 in g_thread_proxy () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#5  0x00007f392d8ed669 in start_thread () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#6  0x00007f392da9d333 in clone () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
.
Thread 3 (Thread 0x7f392a265700 (LWP 1488)):
#0  0x00007f392da90c3f in poll () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f392dc690be in g_main_context_iterate.isra () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#2  0x00007f392dc69443 in g_main_loop_run () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#3  0x00007f392ce18a0a in gdbus_shared_thread_func (user_data=0x5607cfe57fd0) at ../../../gio/gdbusprivate.c:279
        data = 0x5607cfe57fd0
#4  0x00007f392dc92851 in g_thread_proxy () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#5  0x00007f392d8ed669 in start_thread () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#6  0x00007f392da9d333 in clone () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
.
Thread 2 (Thread 0x7f392aa66700 (LWP 1487)):
#0  0x00007f392da90c3f in poll () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f392dc690be in g_main_context_iterate.isra () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#2  0x00007f392dc691f3 in g_main_context_iteration () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#3  0x00007f392dc69241 in glib_worker_main () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#4  0x00007f392dc92851 in g_thread_proxy () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#5  0x00007f392d8ed669 in start_thread () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#6  0x00007f392da9d333 in clone () from /tmp/apport_sandbox_iog7kl3z/lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
.
Thread 1 (Thread 0x7f392b866a80 (LWP 1485)):
#0  INT_cairo_region_num_rectangles (region=region@entry=0xf1) at ../../../../src/cairo-region.c:451
No locals.
#1  0x00007f392db9341e in cairo_region_to_xserver_region (xdisplay=xdisplay@entry=0x5607cfdef640, region=0xf1) at compositor/compositor-xrender.c:607
        n_rects = <optimized out>
        i = <optimized out>
        rects = <optimized out>
        xregion = <optimized out>
#2  0x00007f392db95944 in border_size (cw=0x5607d0302e20) at compositor/compositor-xrender.c:1157
        screen = <optimized out>
        xdisplay = 0x5607cfdef640
        border = <optimized out>
        display = 0x5607d00f3000
        visible_region = <optimized out>
        visible = 0
        screen = <optimized out>
        display = <optimized out>
        xdisplay = <optimized out>
        visible_region = <optimized out>
        visible = <optimized out>
        border = <optimized out>
        __func__ = "border_size"
        _g_boolean_var_ = <optimized out>
#3  paint_windows (region=10566623, root_pixmap=<optimized out>, root_buffer=<optimized out>, windows=<optimized out>, screen=0x5607cffdfd00) at compositor/compositor-xrender.c:1420
        xdisplay = 0x5607cfdef640
        last = 0x5607cffa4280
        paint_region = 10566664
        display = 0x5607d00f3000
        info = 0x5607d01bbf90
        index = 0x5607cffa4280
        screen_width = 1920
        screen_height = 1200
        cw = 0x5607d0302e20
        desktop_region = 0
        display = <optimized out>
        info = <optimized out>
        xdisplay = <optimized out>
        index = <optimized out>
        last = <optimized out>
        screen_width = <optimized out>
        screen_height = <optimized out>
        cw = <optimized out>
        paint_region = <optimized out>
        desktop_region = <optimized out>
        r = <optimized out>
        x = <optimized out>
        y = <optimized out>
        wid = <optimized out>
        hei = <optimized out>
        shadow_clip = <optimized out>
        x = <optimized out>
        y = <optimized out>
        wid = <optimized out>
        hei = <optimized out>
#4  paint_all (screen=screen@entry=0x5607cffdfd00, region=region@entry=10566623, b=<optimized out>) at compositor/compositor-xrender.c:1593
        info = <optimized out>
        display = <optimized out>
        xdisplay = <optimized out>
        screen_width = 1920
        screen_height = 1200
#5  0x00007f392db96ade in repair_screen (screen=0x5607cffdfd00) at compositor/compositor-xrender.c:1620
        damage = 10566623
        info = 0x5607d01bbf90
        display = 0x5607d00f3000
        xdisplay = 0x5607cfdef640
        __func__ = "repair_screen"
#6  0x00007f392db98089 in xrender_present_complete (ce=<optimized out>, screen=0x5607cffdfd00) at compositor/compositor-xrender.c:2719
        info = <optimized out>
#7  process_generic (compositor=0x5607cfe9e710, compositor=0x5607cfe9e710, event=0x7fff0c0ddf90) at compositor/compositor-xrender.c:2743
        ce = <optimized out>
        screen = 0x5607cffdfd00
        ge = 0x7fff0c0ddf90
        xdisplay = 0x5607cfdef640
        ge = <optimized out>
        xdisplay = <optimized out>
        ce = <optimized out>
        screen = <optimized out>
#8  xrender_process_event (compositor=0x5607cfe9e710, event=0x7fff0c0ddf90, window=<optimized out>) at compositor/compositor-xrender.c:3113
        xrc = <optimized out>
#9  0x00007f392dba0ac6 in event_callback (event=0x7fff0c0ddf90, data=0x5607d00f3000) at core/display.c:2696
        window = 0x0
        property_for_window = <optimized out>
        display = 0x5607d00f3000
        modified = <optimized out>
        frame_was_receiver = <optimized out>
        filter_out_event = 0
#10 0x00007f392dbeab59 in filter_func (xevent=0x7fff0c0ddf90, event=<optimized out>, data=<optimized out>) at ui/ui.c:223
        __func__ = "filter_func"
#11 0x00007f392d120f6f in gdk_event_apply_filters () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libgdk-3.so.0.2404.9
No symbol table info available.
#12 0x00007f392d12135a in _gdk_x11_display_queue_events () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libgdk-3.so.0.2404.9
No symbol table info available.
#13 0x00007f392d0e9094 in gdk_display_get_event () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libgdk-3.so.0.2404.9
No symbol table info available.
#14 0x00007f392d121006 in gdk_event_source_dispatch () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libgdk-3.so.0.2404.9
No symbol table info available.
#15 0x00007f392dc68ecd in g_main_context_dispatch () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#16 0x00007f392dc69150 in g_main_context_iterate.isra () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#17 0x00007f392dc69443 in g_main_loop_run () from /tmp/apport_sandbox_iog7kl3z/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6303.0
No symbol table info available.
#18 0x00005607cf89e233 in main ()
No symbol table info available.