#0  0x00007f3f72a21c67 in raise (sig=<optimised out>) at ../sysdeps/unix/sysv/linux/raise.c:50
        set = {__val = {0, 538, 539, 540, 541, 542, 543, 544, 545, 546, 547, 548, 549, 550, 551, 552}}
        pid = <optimised out>
        tid = <optimised out>
#1  0x00005631ad6a201b in  ()
#2  0x00007f3f72a21dd0 in <signal handler called> () at /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f3f72866077 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
        set = {__val = {0, 94771434632789, 94771434632972, 94771434632672, 94771434632972, 139910482795680, 0, 32, 129, 127, 139910482795584, 139910481415256, 569879822336, 3, 2048, 0}}
        pid = <optimised out>
        tid = <optimised out>
#4  0x00007f3f72847535 in __GI_abort () at abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x7f3f73a45579, sa_sigaction = 0x7f3f73a45579}, sa_mask = {__val = {140728898420737, 0, 113, 94771384883392, 1290124942650113024, 206158430232, 139910499816825, 139910499838299, 139910858145792, 94771384883392, 0, 0, 1290124942650113024, 139910484102589, 94771384883392, 114}}, sa_flags = 1940647360, sa_restorer = 0x7ffe0bb628d0}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#5  0x00007f3f739bedd3 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f3f73a1838a in g_assertion_message_expr () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f3f72ade10e in meta_window_unmanage () at /usr/lib/x86_64-linux-gnu/libmutter-3.so.0
#8  0x00007f3f72aee34c in  () at /usr/lib/x86_64-linux-gnu/libmutter-3.so.0
#9  0x00007f3f72aef23b in  () at /usr/lib/x86_64-linux-gnu/libmutter-3.so.0
#10 0x00007f3f72737c7f in  () at /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#11 0x00007f3f72737f49 in  () at /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#12 0x00007f3f727027f0 in gdk_display_get_event () at /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#13 0x00007f3f72737d12 in  () at /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#14 0x00007f3f739f0c3e in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007f3f739f0ed8 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f3f739f11d2 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f3f72acee0c in meta_run () at /usr/lib/x86_64-linux-gnu/libmutter-3.so.0
#18 0x00005631ad6a1847 in  ()
#19 0x00007f3f7284909b in __libc_start_main (main=0x5631ad6a1460, argc=1, argv=0x7ffe0bb62ff8, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7ffe0bb62fe8) at ../csu/libc-start.c:308
        result = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 9177739414136026520, 94771362797936, 140729094909936, 0, 0, 3225330391452611992, 3260710044654368152}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7ffe0bb63008, 0x7f3f73f65190}, data = {prev = 0x0, cleanup = 0x0, canceltype = 196489224}}}
        not_first_call = <optimised out>
#20 0x00005631ad6a199a in  ()