$ gdb -batch -n -ex 'set height 0' -ex bt -ex 'thread apply all bt full' --core /var/crash/1000/3618-1000-1000-6-1445068421-chianamo--usr-bin-gnome-shell.core /usr/bin/gnome-shell
[New LWP 3618]
[New LWP 6559]
[New LWP 6553]
[New LWP 8820]
[New LWP 6554]
[New LWP 6561]
[New LWP 6556]
[New LWP 6560]
[New LWP 8821]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/gnome-shell'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007fe65bec9107 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56	../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
[Current thread is 1 (Thread 0x7fe65f3b4a80 (LWP 3618))]
#0  0x00007fe65bec9107 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007fe65beca4e8 in __GI_abort () at abort.c:89
#2  0x00007fe65c4c9b05 in g_assertion_message (domain=domain@entry=0x7fe65d249470 "Clutter", file=file@entry=0x7fe65d24f6e8 "clutter-actor.c", line=line@entry=1468, func=func@entry=0x7fe65d24f330 <__func__.40030> "clutter_actor_update_map_state", message=message@entry=0x637cdb0 "assertion failed: (!(must_be_realized && !may_be_realized))") at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gtestutils.c:2429
#3  0x00007fe65c4c9b9a in g_assertion_message_expr (domain=domain@entry=0x7fe65d249470 "Clutter", file=file@entry=0x7fe65d24f6e8 "clutter-actor.c", line=line@entry=1468, func=func@entry=0x7fe65d24f330 <__func__.40030> "clutter_actor_update_map_state", expr=expr@entry=0x7fe65d251378 "!(must_be_realized && !may_be_realized)") at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gtestutils.c:2444
#4  0x00007fe65d1a6780 in clutter_actor_update_map_state (self=0x4194eb0 [MetaShapedTexture], change=<optimized out>) at clutter-actor.c:1468
#5  0x00007fe65d1ab8fa in _clutter_actor_set_enable_paint_unmapped (self=<optimized out>, enable=enable@entry=1) at clutter-actor.c:15945
#6  0x00007fe65d1cccbd in clutter_clone_paint (actor=0x50b14e0 [ClutterClone]) at clutter-clone.c:183
#7  0x00007fe65c779192 in _g_closure_invoke_va (closure=closure@entry=0x2468f80, return_value=return_value@entry=0x0, instance=instance@entry=0x50b14e0, args=args@entry=0x7ffedc2ac5c0, n_params=0, param_types=0x0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gclosure.c:864
#8  0x00007fe65c793a46 in g_signal_emit_valist (instance=0x50b14e0, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffedc2ac5c0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3292
#9  0x00007fe65c79412f in g_signal_emit (instance=instance@entry=0x50b14e0, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3439
#10 0x00007fe65d1a708b in clutter_actor_continue_paint (self=self@entry=0x50b14e0 [ClutterClone]) at clutter-actor.c:4022
#11 0x00007fe65d1ad1db in clutter_actor_paint (self=0x50b14e0 [ClutterClone]) at clutter-actor.c:3942
#12 0x00007fe65d1ad510 in clutter_actor_real_paint (actor=<optimized out>) at clutter-actor.c:3641
#13 0x00007fe65c779192 in _g_closure_invoke_va (closure=closure@entry=0x2468f80, return_value=return_value@entry=0x0, instance=instance@entry=0x2e60fd0, args=args@entry=0x7ffedc2aca40, n_params=0, param_types=0x0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gclosure.c:864
#14 0x00007fe65c793a46 in g_signal_emit_valist (instance=0x2e60fd0, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffedc2aca40) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3292
#15 0x00007fe65c79412f in g_signal_emit (instance=instance@entry=0x2e60fd0, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3439
#16 0x00007fe65d1a708b in clutter_actor_continue_paint (self=self@entry=0x2e60fd0 [StWidget]) at clutter-actor.c:4022
#17 0x00007fe65d1ad1db in clutter_actor_paint (self=0x2e60fd0 [StWidget]) at clutter-actor.c:3942
#18 0x00007fe65d1ad510 in clutter_actor_real_paint (actor=<optimized out>) at clutter-actor.c:3641
#19 0x00007fe65c779192 in _g_closure_invoke_va (closure=closure@entry=0x2468f80, return_value=return_value@entry=0x0, instance=instance@entry=0x2d75840, args=args@entry=0x7ffedc2acec0, n_params=0, param_types=0x0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gclosure.c:864
#20 0x00007fe65c793a46 in g_signal_emit_valist (instance=0x2d75840, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffedc2acec0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3292
#21 0x00007fe65c79412f in g_signal_emit (instance=instance@entry=0x2d75840, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3439
#22 0x00007fe65d1a708b in clutter_actor_continue_paint (self=self@entry=0x2d75840 [StWidget]) at clutter-actor.c:4022
#23 0x00007fe65d1ad1db in clutter_actor_paint (self=self@entry=0x2d75840 [StWidget]) at clutter-actor.c:3942
#24 0x00007fe65d1ad4e9 in clutter_actor_paint (self=self@entry=0x2d75840 [StWidget]) at clutter-actor.c:3968
#25 0x00007fe65ee5dbf0 in shell_generic_container_paint (actor=0x2d71d50 [ShellGenericContainer]) at shell-generic-container.c:139
#26 0x00007fe65c779192 in _g_closure_invoke_va (closure=closure@entry=0x2468f80, return_value=return_value@entry=0x0, instance=instance@entry=0x2d71d50, args=args@entry=0x7ffedc2ad350, n_params=0, param_types=0x0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gclosure.c:864
#27 0x00007fe65c793a46 in g_signal_emit_valist (instance=0x2d71d50, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffedc2ad350) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3292
#28 0x00007fe65c79412f in g_signal_emit (instance=instance@entry=0x2d71d50, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3439
#29 0x00007fe65d1a708b in clutter_actor_continue_paint (self=self@entry=0x2d71d50 [ShellGenericContainer]) at clutter-actor.c:4022
#30 0x00007fe65d1ad1db in clutter_actor_paint (self=0x2d71d50 [ShellGenericContainer]) at clutter-actor.c:3942
#31 0x00007fe65d1ad4e9 in clutter_actor_paint (self=<optimized out>) at clutter-actor.c:3968
#32 0x00007fe65d1ff55a in clutter_stage_paint (self=<optimized out>) at clutter-stage.c:704
#33 0x00007fe65de26c25 in meta_stage_paint (actor=0x246bb10 [MetaStage]) at backends/meta-stage.c:124
#34 0x00007fe65c779244 in _g_closure_invoke_va (closure=closure@entry=0x2468f80, return_value=return_value@entry=0x0, instance=instance@entry=0x246bb10, args=args@entry=0x7ffedc2ad860, n_params=<optimized out>, param_types=0x0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gclosure.c:864
#35 0x00007fe65c793a46 in g_signal_emit_valist (instance=0x246bb10, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffedc2ad860) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3292
#36 0x00007fe65c79412f in g_signal_emit (instance=instance@entry=0x246bb10, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3439
#37 0x00007fe65d1a708b in clutter_actor_continue_paint (self=self@entry=0x246bb10 [MetaStage]) at clutter-actor.c:4022
#38 0x00007fe65d1ad1db in clutter_actor_paint (self=self@entry=0x246bb10 [MetaStage]) at clutter-actor.c:3942
#39 0x00007fe65d1ad4e9 in clutter_actor_paint (self=self@entry=0x246bb10 [MetaStage]) at clutter-actor.c:3968
#40 0x00007fe65d20376b in _clutter_stage_do_paint (stage=stage@entry=0x246bb10 [MetaStage], clip=clip@entry=0x0) at clutter-stage.c:687
#41 0x00007fe65d1962f9 in clutter_stage_cogl_redraw (stage_window=0x246d110) at cogl/clutter-stage-cogl.c:548
#42 0x00007fe65d201f97 in _clutter_stage_do_update (stage=0x246bb10 [MetaStage]) at clutter-stage.c:1130
#43 0x00007fe65d201f97 in _clutter_stage_do_update (stage=0x246bb10 [MetaStage]) at clutter-stage.c:1186
Python Exception <class 'TypeError'> iter() returned non-iterator of type '_iterator': 
#44 0x00007fe65d1ebce9 in clutter_clock_dispatch (master_clock=0x2929c40 [ClutterMasterClockDefault], stages=0x3fc5fa0) at clutter-master-clock-default.c:443
#45 0x00007fe65d1ebce9 in clutter_clock_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at clutter-master-clock-default.c:567
#46 0x00007fe65c4a3fe7 in g_main_context_dispatch (context=0x917ed0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3154
#47 0x00007fe65c4a3fe7 in g_main_context_dispatch (context=context@entry=0x917ed0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3769
#48 0x00007fe65c4a4240 in g_main_context_iterate (context=0x917ed0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3840
#49 0x00007fe65c4a4562 in g_main_loop_run (loop=0x955d20) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:4034
#50 0x00007fe65de4f656 in meta_run () at core/main.c:437
#51 0x00000000004020ff in main (argc=1, argv=0x7ffedc2adf28) at main.c:463

Thread 9 (Thread 0x7fe60e5fe700 (LWP 8821)):
#0  0x00007fe65bf75ff9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fe65c4e8ada in g_cond_wait_until (cond=cond@entry=0x248aac8, mutex=mutex@entry=0x248aac0, end_time=end_time@entry=12029184541) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthread-posix.c:1444
        now = {tv_sec = 12028, tv_nsec = 684541700}
        span = {tv_sec = 0, tv_nsec = 499999300}
        sampled = 125
        res = <optimized out>
#2  0x00007fe65c478a59 in g_async_queue_pop_intern_unlocked (queue=0x248aac0, wait=wait@entry=1, end_time=12029184541) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gasyncqueue.c:422
        retval = <optimized out>
        __func__ = "g_async_queue_pop_intern_unlocked"
#3  0x00007fe65c4790b8 in g_async_queue_timeout_pop_unlocked (queue=<optimized out>, timeout=timeout@entry=500000) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gasyncqueue.c:570
        end_time = <optimized out>
#4  0x00007fe65c4cb2c6 in g_thread_pool_thread_proxy (pool=0x248aa60) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthreadpool.c:262
        task = 0x0
        task = 0x45b8c70
        pool = 0x248aa60
#5  0x00007fe65c4cb2c6 in g_thread_pool_thread_proxy (data=<optimized out>) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthreadpool.c:296
        task = 0x45b8c70
        pool = 0x248aa60
#6  0x00007fe65c4ca955 in g_thread_proxy (data=0x707c590) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthread.c:778
        thread = <optimized out>
#7  0x00007fe65c2450a4 in start_thread (arg=0x7fe60e5fe700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fe60e5fe700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140626060371712, -5259237910421344126, 0, 104464880, 25, 140626060371712, 5246537725276942466, 5246648161921626242}, 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"
#8  0x00007fe65bf7a06d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 8 (Thread 0x7fe63e5f4700 (LWP 6560)):
#0  0x00007fe65c24908f in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe64dac7d00 in PR_WaitCondVar (cvar=0x2619be0, timeout=4294967295) at ptsynch.c:396
        rv = <optimized out>
        thred = 0x2603c00
#2  0x00007fe657cfff0e in js::GCHelperThread::threadLoop() (this=0x26c5858) at /tmp/buildd/mozjs24-24.2.0/js/src/jsgc.cpp:2266
        lock = {runtime = 0x26c4ae0}
#3  0x00007fe64dacd668 in _pt_root (arg=0x2603c00) at ptthread.c:212
        rv = <optimized out>
        thred = 0x2603c00
        detached = 0
        id = 140626865637120
        tid = 6560
#4  0x00007fe65c2450a4 in start_thread (arg=0x7fe63e5f4700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fe63e5f4700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140626865637120, -5259237910421344126, 0, 140627418042464, 39861248, 140626865637120, 5246432166791966850, 5246648161921626242}, 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"
#5  0x00007fe65bf7a06d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 7 (Thread 0x7fe63f7fe700 (LWP 6556)):
#0  0x00007fe65bf7152d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fe65c4a41dc in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7fe62c0010c0, timeout=<optimized out>, context=0x249f630) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:4135
        poll_func = 0x7fe65c4b30d0 <g_poll>
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x7fe62c0010c0
#2  0x00007fe65c4a41dc in g_main_context_iterate (context=context@entry=0x249f630, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3835
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x7fe62c0010c0
#3  0x00007fe65c4a42ec in g_main_context_iteration (context=0x249f630, may_block=1) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3901
        retval = <optimized out>
#4  0x00007fe64453728d in  () at /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
#5  0x00007fe65c4ca955 in g_thread_proxy (data=0x249c0f0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthread.c:778
        thread = <optimized out>
#6  0x00007fe65c2450a4 in start_thread (arg=0x7fe63f7fe700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fe63f7fe700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140626884552448, -5259237910421344126, 0, 140627418042464, 140627367733504, 140626884552448, 5246429698259513474, 5246648161921626242}, 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"
#7  0x00007fe65bf7a06d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 6 (Thread 0x7fe63ddf3700 (LWP 6561)):
#0  0x00007fe65c24908f in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe64dac7d00 in PR_WaitCondVar (cvar=0x25d8010, timeout=4294967295) at ptsynch.c:396
        rv = <optimized out>
        thred = 0x25e3f70
#2  0x00007fe657d775ce in js::SourceCompressorThread::compressorThread(void*) (this=0x26c5938) at /tmp/buildd/mozjs24-24.2.0/js/src/jsscript.cpp:1094
#3  0x00007fe657d775ce in js::SourceCompressorThread::compressorThread(void*) (arg=0x26c5938) at /tmp/buildd/mozjs24-24.2.0/js/src/jsscript.cpp:965
#4  0x00007fe64dacd668 in _pt_root (arg=0x25e3f70) at ptthread.c:212
        rv = <optimized out>
        thred = 0x25e3f70
        detached = 0
        id = 140626857244416
        tid = 6561
#5  0x00007fe65c2450a4 in start_thread (arg=0x7fe63ddf3700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fe63ddf3700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140626857244416, -5259237910421344126, 0, 140627418042464, 39731056, 140626857244416, 5246435465863721090, 5246648161921626242}, 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  0x00007fe65bf7a06d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 5 (Thread 0x7fe644f3d700 (LWP 6554)):
#0  0x00007fe65bf7152d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fe65c4a41dc in g_main_context_iterate (priority=2147483647, n_fds=3, fds=0x7fe6380405d0, timeout=<optimized out>, context=0x248bd10) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:4135
        poll_func = 0x7fe65c4b30d0 <g_poll>
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 3
        allocated_nfds = 4
        fds = 0x7fe6380405d0
#2  0x00007fe65c4a41dc in g_main_context_iterate (context=0x248bd10, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3835
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 3
        allocated_nfds = 4
        fds = 0x7fe6380405d0
#3  0x00007fe65c4a4562 in g_main_loop_run (loop=0x950620) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:4034
        __func__ = "g_main_loop_run"
#4  0x00007fe65cca94c6 in gdbus_shared_thread_func (user_data=0x248bce0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gio/gdbusprivate.c:246
        data = 0x248bce0
#5  0x00007fe65c4ca955 in g_thread_proxy (data=0x918190) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthread.c:778
        thread = <optimized out>
#6  0x00007fe65c2450a4 in start_thread (arg=0x7fe644f3d700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fe644f3d700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140626976036608, -5259237910421344126, 0, 140627418042464, 140627367733504, 140626976036608, 5246666196875571330, 5246648161921626242}, 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"
#7  0x00007fe65bf7a06d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7fe620c9c700 (LWP 8820)):
#0  0x00007fe65bf75ff9 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fe65c4e8ada in g_cond_wait_until (cond=cond@entry=0x248aac8, mutex=mutex@entry=0x248aac0, end_time=end_time@entry=12029049686) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthread-posix.c:1444
        now = {tv_sec = 12028, tv_nsec = 549686978}
        span = {tv_sec = 0, tv_nsec = 499999022}
        sampled = 124
        res = <optimized out>
#2  0x00007fe65c478a59 in g_async_queue_pop_intern_unlocked (queue=0x248aac0, wait=wait@entry=1, end_time=12029049686) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gasyncqueue.c:422
        retval = <optimized out>
        __func__ = "g_async_queue_pop_intern_unlocked"
#3  0x00007fe65c4790b8 in g_async_queue_timeout_pop_unlocked (queue=<optimized out>, timeout=timeout@entry=500000) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gasyncqueue.c:570
        end_time = <optimized out>
#4  0x00007fe65c4cb2c6 in g_thread_pool_thread_proxy (pool=0x248aa60) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthreadpool.c:262
        task = 0x0
        task = 0x2d0bc10
        pool = 0x248aa60
#5  0x00007fe65c4cb2c6 in g_thread_pool_thread_proxy (data=<optimized out>) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthreadpool.c:296
        task = 0x2d0bc10
        pool = 0x248aa60
#6  0x00007fe65c4ca955 in g_thread_proxy (data=0x5367b70) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthread.c:778
        thread = <optimized out>
#7  0x00007fe65c2450a4 in start_thread (arg=0x7fe620c9c700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fe620c9c700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140626369300224, -5259237910421344126, 0, 41351072, 25, 140626369300224, 5246464245902700674, 5246648161921626242}, 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"
#8  0x00007fe65bf7a06d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7fe6480e7700 (LWP 6553)):
#0  0x00007fe65bf7152d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fe65c4a41dc in g_main_context_iterate (priority=2147483647, n_fds=2, fds=0x7fe6400008e0, timeout=<optimized out>, context=0x917e10) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:4135
        poll_func = 0x7fe65c4b30d0 <g_poll>
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 2
        allocated_nfds = 2
        fds = 0x7fe6400008e0
#2  0x00007fe65c4a41dc in g_main_context_iterate (context=context@entry=0x917e10, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3835
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 2
        allocated_nfds = 2
        fds = 0x7fe6400008e0
#3  0x00007fe65c4a42ec in g_main_context_iteration (context=0x917e10, may_block=may_block@entry=1) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3901
        retval = <optimized out>
#4  0x00007fe65c4a4329 in glib_worker_main (data=<optimized out>) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:5672
#5  0x00007fe65c4ca955 in g_thread_proxy (data=0x918000) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gthread.c:778
        thread = <optimized out>
#6  0x00007fe65c2450a4 in start_thread (arg=0x7fe6480e7700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fe6480e7700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140627028113152, -5259237910421344126, 0, 140627418042464, 140627367733504, 140627028113152, 5246692332825309314, 5246648161921626242}, 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"
#7  0x00007fe65bf7a06d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7fe63edf5700 (LWP 6559)):
#0  0x00007fe65bf7152d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fe65831b831 in poll_func (__timeout=-1, __nfds=3, __fds=0x7fe630006c50) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
        mutex = <optimized out>
#2  0x00007fe65831b831 in poll_func (ufds=0x7fe630006c50, nfds=3, timeout=-1, userdata=0x25ee170) at pulse/thread-mainloop.c:69
        mutex = <optimized out>
#3  0x00007fe65830ce51 in pa_mainloop_poll (m=m@entry=0x25ee070) at pulse/mainloop.c:844
        __func__ = "pa_mainloop_poll"
        __PRETTY_FUNCTION__ = "pa_mainloop_poll"
#4  0x00007fe65830d4ee in pa_mainloop_iterate (m=0x25ee070, block=<optimized out>, retval=0x0) at pulse/mainloop.c:926
        r = 0
#5  0x00007fe65830d5a0 in pa_mainloop_run (m=0x25ee070, retval=retval@entry=0x0) at pulse/mainloop.c:944
        r = <optimized out>
#6  0x00007fe65831b7c6 in thread (userdata=0x25a1a50) at pulse/thread-mainloop.c:88
        m = 0x25a1a50
        mask = {__val = {18446744067267100671, 18446744073709551615 <repeats 15 times>}}
#7  0x00007fe64e34bff8 in internal_thread_func (userdata=0x25ecb40) at pulsecore/thread-posix.c:81
        t = 0x25ecb40
#8  0x00007fe65c2450a4 in start_thread (arg=0x7fe63edf5700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fe63edf5700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140626874029824, -5259237910421344126, 0, 140627418042464, 33865184, 140626874029824, 5246433267914207362, 5246648161921626242}, 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"
#9  0x00007fe65bf7a06d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7fe65f3b4a80 (LWP 3618)):
#0  0x00007fe65bec9107 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 3618
        selftid = 3618
#1  0x00007fe65beca4e8 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7fe65d24f330 <__func__.40030>, sa_sigaction = 0x7fe65d24f330 <__func__.40030>}, sa_mask = {__val = {0, 127, 140627415866903, 5, 0, 511101108334, 140627361246504, 111751024, 127, 140627370476256, 140627415892789, 0, 254, 0, 0, 140627365033504}}, sa_flags = 160, sa_restorer = 0x0}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007fe65c4c9b05 in g_assertion_message (domain=domain@entry=0x7fe65d249470 "Clutter", file=file@entry=0x7fe65d24f6e8 "clutter-actor.c", line=line@entry=1468, func=func@entry=0x7fe65d24f330 <__func__.40030> "clutter_actor_update_map_state", message=message@entry=0x637cdb0 "assertion failed: (!(must_be_realized && !may_be_realized))") at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gtestutils.c:2429
        lstr = "1468\000\177\000\000\000ȱ\216\350\245\360(\000\000\000\000\000\000\000\000x\023%]\346\177\000"
        s = 0x6a92f70 "xv#\\\346\177"
#3  0x00007fe65c4c9b9a in g_assertion_message_expr (domain=domain@entry=0x7fe65d249470 "Clutter", file=file@entry=0x7fe65d24f6e8 "clutter-actor.c", line=line@entry=1468, func=func@entry=0x7fe65d24f330 <__func__.40030> "clutter_actor_update_map_state", expr=expr@entry=0x7fe65d251378 "!(must_be_realized && !may_be_realized)") at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gtestutils.c:2444
        s = 0x637cdb0 "assertion failed: (!(must_be_realized && !may_be_realized))"
#4  0x00007fe65d1a6780 in clutter_actor_update_map_state (self=0x4194eb0 [MetaShapedTexture], change=<optimized out>) at clutter-actor.c:1468
        parent = <optimized out>
        must_be_realized = <optimized out>
        priv = <optimized out>
        should_be_mapped = <optimized out>
        may_be_realized = <optimized out>
        was_mapped = <optimized out>
        __func__ = "clutter_actor_update_map_state"
#5  0x00007fe65d1ab8fa in _clutter_actor_set_enable_paint_unmapped (self=<optimized out>, enable=enable@entry=1) at clutter-actor.c:15945
        priv = <optimized out>
        __func__ = "_clutter_actor_set_enable_paint_unmapped"
#6  0x00007fe65d1cccbd in clutter_clone_paint (actor=0x50b14e0 [ClutterClone]) at clutter-clone.c:183
        self = 0x50b14e0 [ClutterClone]
        priv = 0x50b11b0
        was_unmapped = 0
#7  0x00007fe65c779192 in _g_closure_invoke_va (closure=closure@entry=0x2468f80, return_value=return_value@entry=0x0, instance=instance@entry=0x50b14e0, args=args@entry=0x7ffedc2ac5c0, n_params=0, param_types=0x0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gclosure.c:864
        marshal = <optimized out>
        marshal_data = <optimized out>
        in_marshal = 1
        real_closure = 0x2468f60
        __func__ = "_g_closure_invoke_va"
#8  0x00007fe65c793a46 in g_signal_emit_valist (instance=0x50b14e0, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffedc2ac5c0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3292
        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 = 0x7ffedc2ac940, instance = 0x50b14e0, ihint = {signal_id = 31, detail = 0, run_type = G_SIGNAL_RUN_LAST}, state = EMISSION_RUN, chain_type = 33911664}
        signal_id = 31
        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
        fastpath_handler = <optimized out>
        closure = <optimized out>
        run_type = <optimized out>
        l = <optimized out>
        fastpath = <optimized out>
        instance_and_params = <optimized out>
        signal_return_type = <optimized out>
        param_values = <optimized out>
        i = <optimized out>
        n_params = <optimized out>
        __func__ = "g_signal_emit_valist"
#9  0x00007fe65c79412f in g_signal_emit (instance=instance@entry=0x50b14e0, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3439
        var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7ffedc2ac6a0, reg_save_area = 0x7ffedc2ac5e0}}
#10 0x00007fe65d1a708b in clutter_actor_continue_paint (self=self@entry=0x50b14e0 [ClutterClone]) at clutter-actor.c:4022
        dummy = 0x7fe600086700
        priv = <optimized out>
        __func__ = "clutter_actor_continue_paint"
#11 0x00007fe65d1ad1db in clutter_actor_paint (self=0x50b14e0 [ClutterClone]) at clutter-actor.c:3942
        priv = 0x50b11c0
        pick_mode = <optimized out>
        clip_set = 0
        shader_applied = 0
#12 0x00007fe65d1ad510 in clutter_actor_real_paint (actor=<optimized out>) at clutter-actor.c:3641
        priv = <optimized out>
        iter = 0x50b14e0 [ClutterClone]
#13 0x00007fe65c779192 in _g_closure_invoke_va (closure=closure@entry=0x2468f80, return_value=return_value@entry=0x0, instance=instance@entry=0x2e60fd0, args=args@entry=0x7ffedc2aca40, n_params=0, param_types=0x0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gclosure.c:864
        marshal = <optimized out>
        marshal_data = <optimized out>
        in_marshal = 1
        real_closure = 0x2468f60
        __func__ = "_g_closure_invoke_va"
#14 0x00007fe65c793a46 in g_signal_emit_valist (instance=0x2e60fd0, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffedc2aca40) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3292
        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 = 0x7ffedc2acdc0, instance = 0x2e60fd0, ihint = {signal_id = 31, detail = 0, run_type = G_SIGNAL_RUN_LAST}, state = EMISSION_RUN, chain_type = 42185376}
        signal_id = 31
        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
        fastpath_handler = <optimized out>
        closure = <optimized out>
        run_type = <optimized out>
        l = <optimized out>
        fastpath = <optimized out>
        instance_and_params = <optimized out>
        signal_return_type = <optimized out>
        param_values = <optimized out>
        i = <optimized out>
        n_params = <optimized out>
        __func__ = "g_signal_emit_valist"
#15 0x00007fe65c79412f in g_signal_emit (instance=instance@entry=0x2e60fd0, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3439
        var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7ffedc2acb20, reg_save_area = 0x7ffedc2aca60}}
#16 0x00007fe65d1a708b in clutter_actor_continue_paint (self=self@entry=0x2e60fd0 [StWidget]) at clutter-actor.c:4022
        dummy = 0x7fe600043400
        priv = <optimized out>
        __func__ = "clutter_actor_continue_paint"
#17 0x00007fe65d1ad1db in clutter_actor_paint (self=0x2e60fd0 [StWidget]) at clutter-actor.c:3942
        priv = 0x2e60cb0
        pick_mode = <optimized out>
        clip_set = 0
        shader_applied = 0
#18 0x00007fe65d1ad510 in clutter_actor_real_paint (actor=<optimized out>) at clutter-actor.c:3641
        priv = <optimized out>
        iter = 0x2e60fd0 [StWidget]
#19 0x00007fe65c779192 in _g_closure_invoke_va (closure=closure@entry=0x2468f80, return_value=return_value@entry=0x0, instance=instance@entry=0x2d75840, args=args@entry=0x7ffedc2acec0, n_params=0, param_types=0x0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gclosure.c:864
        marshal = <optimized out>
        marshal_data = <optimized out>
        in_marshal = 1
        real_closure = 0x2468f60
        __func__ = "_g_closure_invoke_va"
#20 0x00007fe65c793a46 in g_signal_emit_valist (instance=0x2d75840, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffedc2acec0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3292
        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 = 0x7ffedc2ad250, instance = 0x2d75840, ihint = {signal_id = 31, detail = 0, run_type = G_SIGNAL_RUN_LAST}, state = EMISSION_RUN, chain_type = 42185376}
        signal_id = 31
        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
        fastpath_handler = <optimized out>
        closure = <optimized out>
        run_type = <optimized out>
        l = <optimized out>
        fastpath = <optimized out>
        instance_and_params = <optimized out>
        signal_return_type = <optimized out>
        param_values = <optimized out>
        i = <optimized out>
        n_params = <optimized out>
        __func__ = "g_signal_emit_valist"
#21 0x00007fe65c79412f in g_signal_emit (instance=instance@entry=0x2d75840, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3439
        var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7ffedc2acfa0, reg_save_area = 0x7ffedc2acee0}}
#22 0x00007fe65d1a708b in clutter_actor_continue_paint (self=self@entry=0x2d75840 [StWidget]) at clutter-actor.c:4022
        dummy = 0x7fe6000434c0
        priv = <optimized out>
        __func__ = "clutter_actor_continue_paint"
#23 0x00007fe65d1ad1db in clutter_actor_paint (self=self@entry=0x2d75840 [StWidget]) at clutter-actor.c:3942
        priv = 0x2d75520
        pick_mode = <optimized out>
        clip_set = 0
        shader_applied = 0
#24 0x00007fe65d1ad4e9 in clutter_actor_paint (self=self@entry=0x2d75840 [StWidget]) at clutter-actor.c:3968
#25 0x00007fe65ee5dbf0 in shell_generic_container_paint (actor=0x2d71d50 [ShellGenericContainer]) at shell-generic-container.c:139
        self = 0x2d71d50 [ShellGenericContainer]
        child = 0x2d75840 [StWidget]
#26 0x00007fe65c779192 in _g_closure_invoke_va (closure=closure@entry=0x2468f80, return_value=return_value@entry=0x0, instance=instance@entry=0x2d71d50, args=args@entry=0x7ffedc2ad350, n_params=0, param_types=0x0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gclosure.c:864
        marshal = <optimized out>
        marshal_data = <optimized out>
        in_marshal = 1
        real_closure = 0x2468f60
        __func__ = "_g_closure_invoke_va"
#27 0x00007fe65c793a46 in g_signal_emit_valist (instance=0x2d71d50, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffedc2ad350) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3292
        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 = 0x7ffedc2ad760, instance = 0x2d71d50, ihint = {signal_id = 31, detail = 0, run_type = G_SIGNAL_RUN_LAST}, state = EMISSION_RUN, chain_type = 47943072}
        signal_id = 31
        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
        fastpath_handler = <optimized out>
        closure = <optimized out>
        run_type = <optimized out>
        l = <optimized out>
        fastpath = <optimized out>
        instance_and_params = <optimized out>
        signal_return_type = <optimized out>
        param_values = <optimized out>
        i = <optimized out>
        n_params = <optimized out>
        __func__ = "g_signal_emit_valist"
#28 0x00007fe65c79412f in g_signal_emit (instance=instance@entry=0x2d71d50, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3439
        var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7ffedc2ad430, reg_save_area = 0x7ffedc2ad370}}
#29 0x00007fe65d1a708b in clutter_actor_continue_paint (self=self@entry=0x2d71d50 [ShellGenericContainer]) at clutter-actor.c:4022
        dummy = 0x7fe6000866a0
        priv = <optimized out>
        __func__ = "clutter_actor_continue_paint"
#30 0x00007fe65d1ad1db in clutter_actor_paint (self=0x2d71d50 [ShellGenericContainer]) at clutter-actor.c:3942
        priv = 0x2d71a30
        pick_mode = <optimized out>
        clip_set = 0
        shader_applied = 0
#31 0x00007fe65d1ad4e9 in clutter_actor_paint (self=<optimized out>) at clutter-actor.c:3968
#32 0x00007fe65d1ff55a in clutter_stage_paint (self=<optimized out>) at clutter-stage.c:704
        iter = {dummy1 = 0x246bb10, dummy2 = 0x2d71d50, dummy3 = 0x0, dummy4 = 9, dummy5 = 0x2468f80}
        child = 0x2d71d50 [ShellGenericContainer]
#33 0x00007fe65de26c25 in meta_stage_paint (actor=0x246bb10 [MetaStage]) at backends/meta-stage.c:124
        stage = <optimized out>
#34 0x00007fe65c779244 in _g_closure_invoke_va (closure=closure@entry=0x2468f80, return_value=return_value@entry=0x0, instance=instance@entry=0x246bb10, args=args@entry=0x7ffedc2ad860, n_params=<optimized out>, param_types=0x0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gclosure.c:864
        marshal = <optimized out>
        marshal_data = <optimized out>
        in_marshal = 0
        real_closure = 0x2468f60
        __func__ = "_g_closure_invoke_va"
#35 0x00007fe65c793a46 in g_signal_emit_valist (instance=0x246bb10, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7ffedc2ad860) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3292
        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 = 0x246bb10, ihint = {signal_id = 31, detail = 0, run_type = G_SIGNAL_RUN_LAST}, state = EMISSION_RUN, chain_type = 9559280}
        signal_id = 31
        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
        fastpath_handler = <optimized out>
        closure = <optimized out>
        run_type = <optimized out>
        l = <optimized out>
        fastpath = <optimized out>
        instance_and_params = <optimized out>
        signal_return_type = <optimized out>
        param_values = <optimized out>
        i = <optimized out>
        n_params = <optimized out>
        __func__ = "g_signal_emit_valist"
#36 0x00007fe65c79412f in g_signal_emit (instance=instance@entry=0x246bb10, signal_id=<optimized out>, detail=detail@entry=0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./gobject/gsignal.c:3439
        var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7ffedc2ad940, reg_save_area = 0x7ffedc2ad880}}
#37 0x00007fe65d1a708b in clutter_actor_continue_paint (self=self@entry=0x246bb10 [MetaStage]) at clutter-actor.c:4022
        dummy = 0x7fe600086520
        priv = <optimized out>
        __func__ = "clutter_actor_continue_paint"
#38 0x00007fe65d1ad1db in clutter_actor_paint (self=self@entry=0x246bb10 [MetaStage]) at clutter-actor.c:3942
        priv = 0x246b7f0
        pick_mode = <optimized out>
        clip_set = 0
        shader_applied = 0
#39 0x00007fe65d1ad4e9 in clutter_actor_paint (self=self@entry=0x246bb10 [MetaStage]) at clutter-actor.c:3968
#40 0x00007fe65d20376b in _clutter_stage_do_paint (stage=stage@entry=0x246bb10 [MetaStage], clip=clip@entry=0x0) at clutter-stage.c:687
        priv = <optimized out>
        clip_poly = {0, 0, 2960, 0, 2960, 1117, 0, 1117}
        viewport = {0, 0, 2960, 1117}
        geom = {x = 0, y = 0, width = 2960, height = 1117}
        window_scale = <optimized out>
#41 0x00007fe65d1962f9 in clutter_stage_cogl_redraw (stage_window=0x246d110) at cogl/clutter-stage-cogl.c:548
        stage_cogl = <optimized out>
        geom = {x = 0, y = 0, width = 2960, height = 1117}
        have_clip = <optimized out>
        may_use_clipped_redraw = <optimized out>
        use_clipped_redraw = 0
        can_blit_sub_buffer = <optimized out>
        has_buffer_age = <optimized out>
        wrapper = <optimized out>
        clip_region = <optimized out>
        damage = {48782656, 0, -1900951552, 686859752}
        ndamage = <optimized out>
        force_swap = 0
        window_scale = 1
#42 0x00007fe65d201f97 in _clutter_stage_do_update (stage=0x246bb10 [MetaStage]) at clutter-stage.c:1130
        backend = <optimized out>
        actor = 0x246bb10 [MetaStage]
        priv = 0x246b510
        priv = <optimized out>
#43 0x00007fe65d201f97 in _clutter_stage_do_update (stage=0x246bb10 [MetaStage]) at clutter-stage.c:1186
        priv = <optimized out>
Python Exception <class 'TypeError'> iter() returned non-iterator of type '_iterator': 
#44 0x00007fe65d1ebce9 in clutter_clock_dispatch (master_clock=0x2929c40 [ClutterMasterClockDefault], stages=0x3fc5fa0) at clutter-master-clock-default.c:443
        stages_updated = 0
Python Exception <class 'TypeError'> iter() returned non-iterator of type '_iterator': 
        l = 0x3fc5fa0
        clock_source = <optimized out>
        master_clock = 0x2929c40 [ClutterMasterClockDefault]
        stages_updated = 0
#45 0x00007fe65d1ebce9 in clutter_clock_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at clutter-master-clock-default.c:567
        clock_source = <optimized out>
        master_clock = 0x2929c40 [ClutterMasterClockDefault]
        stages_updated = 0
#46 0x00007fe65c4a3fe7 in g_main_context_dispatch (context=0x917ed0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3154
        dispatch = 0x7fe65d1ebb80 <clutter_clock_dispatch>
        prev_source = 0x0
        was_in_call = 0
        user_data = 0x0
        callback = 0x0
        cb_funcs = <optimized out>
        cb_data = <optimized out>
        need_destroy = <optimized out>
        source = 0x288c550
        current = 0xe6a7a0
        i = 0
#47 0x00007fe65c4a3fe7 in g_main_context_dispatch (context=context@entry=0x917ed0) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3769
#48 0x00007fe65c4a4240 in g_main_context_iterate (context=0x917ed0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:3840
        max_priority = 150
        timeout = 0
        some_ready = 1
        nfds = <optimized out>
        allocated_nfds = 14
        fds = 0x4ce82c0
#49 0x00007fe65c4a4562 in g_main_loop_run (loop=0x955d20) at /build/glib2.0-BMd9vh/glib2.0-2.46.0/./glib/gmain.c:4034
        __func__ = "g_main_loop_run"
#50 0x00007fe65de4f656 in meta_run () at core/main.c:437
#51 0x00000000004020ff in main (argc=1, argv=0x7ffedc2adf28) at main.c:463
        ctx = <optimized out>
        error = 0x0
        ecode = <optimized out>
        sender = 0x2587e80 [TpDebugSender]
