good morning, here is the trace, also attached as file:

simple bt:

(gdb) bt
#0  0x00007ffff7558203 in gtk_widget_show (widget=0x555555badb40) at 
../../../gtk/gtkwidget.c:4827
#1  0x00005555555d39cd in ?? ()
#2  0x00007ffff60cdb16 in ffi_call_unix64 () at ../src/x86/unix64.S:104
#3  0x00007ffff60ca3ef in ffi_call_int (cif=cif@entry=0x7fffffffdb10, 
fn=<optimized out>, rvalue=<optimized out>, avalue=<optimized out>, 
closure=closure@entry=0x0) at ../src/x86/ffi64.c:673
#4  0x00007ffff60cd0be in ffi_call (cif=0x7fffffffdb10, fn=<optimized out>, 
rvalue=<optimized out>, avalue=<optimized out>) at ../src/x86/ffi64.c:710
#5  0x00007ffff6e0c2d3 in g_cclosure_marshal_generic_va () from 
/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6  0x00007ffff6e256bd in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#7  0x00007ffff6e257c1 in g_signal_emit_valist () from 
/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8  0x00007ffff6e25883 in g_signal_emit () from 
/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#9  0x00005555555d50aa in ?? ()
#10 0x00007ffff6d0448e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007ffff6d63717 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007ffff6d04f77 in g_main_loop_run () from 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x000055555557bb16 in ?? ()
#14 0x00007ffff6a2a1ca in __libc_start_call_main 
(main=main@entry=0x55555557b970, argc=argc@entry=2, 
argv=argv@entry=0x7fffffffe158) at ../sysdeps/nptl/libc_start_call_main.h:58
#15 0x00007ffff6a2a28b in __libc_start_main_impl (main=0x55555557b970, argc=2, 
argv=0x7fffffffe158, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7fffffffe148) at ../csu/libc-start.c:360
#16 0x000055555557bbf5 in ?? ()


full bt:


(gdb) bt full
#0  0x00007ffff7558203 in gtk_widget_show (widget=0x555555badb40) at 
../../../gtk/gtkwidget.c:4827
        __inst = 0x555555badb40
        __t = 93824993441888
        __r = <optimized out>
        _g_boolean_var_23 = <optimized out>
        __func__ = "gtk_widget_show"
        parent = <optimized out>
#1  0x00005555555d39cd in ?? ()
No symbol table info available.
#2  0x00007ffff60cdb16 in ffi_call_unix64 () at ../src/x86/unix64.S:104
No locals.
#3  0x00007ffff60ca3ef in ffi_call_int (cif=cif@entry=0x7fffffffdb10, 
fn=<optimized out>, rvalue=<optimized out>, avalue=<optimized out>, 
closure=closure@entry=0x0) at ../src/x86/ffi64.c:673
        classes = {X86_64_INTEGER_CLASS, X86_64_NO_CLASS, 4128043680, 32767}
        stack = <optimized out>
        argp = 0x7fffffffd860 ""
        arg_types = <optimized out>
        gprcount = 4
        ssecount = <optimized out>
        ngpr = 1
        nsse = 0
        i = <optimized out>
        avn = <optimized out>
        flags = <optimized out>
        reg_args = <optimized out>
#4  0x00007ffff60cd0be in ffi_call (cif=0x7fffffffdb10, fn=<optimized out>, 
rvalue=<optimized out>, avalue=<optimized out>) at ../src/x86/ffi64.c:710
        arg_types = 0x7fffffffda40
        i = <optimized out>
        nargs = 4
        max_reg_struct_size = <optimized out>
#5  0x00007ffff6e0c2d3 in g_cclosure_marshal_generic_va () from 
/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
--Type <RET> for more, q to quit, c to continue without paging--
#6  0x00007ffff6e256bd in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#7  0x00007ffff6e257c1 in g_signal_emit_valist () from 
/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#8  0x00007ffff6e25883 in g_signal_emit () from 
/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#9  0x00005555555d50aa in ?? ()
No symbol table info available.
#10 0x00007ffff6d0448e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#11 0x00007ffff6d63717 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#12 0x00007ffff6d04f77 in g_main_loop_run () from 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#13 0x000055555557bb16 in ?? ()
No symbol table info available.
#14 0x00007ffff6a2a1ca in __libc_start_call_main 
(main=main@entry=0x55555557b970, argc=argc@entry=2, 
argv=argv@entry=0x7fffffffe158) at ../sysdeps/nptl/libc_start_call_main.h:58
        self = <optimized out>
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140737488347480, 
5184997257997279039, 2, 0, 93824992984848, 140737354125312, 
5184997258016153407, 5185012279689568063}, mask_was_saved = 0}}, priv = {pad = 
{0x0, 0x0, 0x2, 0x7fffffffe150}, data = {prev = 0x0, cleanup = 0x0, canceltype 
= 2}}}
        not_first_call = <optimized out>
#15 0x00007ffff6a2a28b in __libc_start_main_impl (main=0x55555557b970, argc=2, 
argv=0x7fffffffe158, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7fffffffe148) at ../csu/libc-start.c:360
No locals.
#16 0x000055555557bbf5 in ?? ()


** Attachment added: "gdb-gnome-flashback.txt"
   
https://bugs.launchpad.net/ubuntu/+source/gnome-flashback/+bug/2086706/+attachment/5853343/+files/gdb-gnome-flashback.txt

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https://bugs.launchpad.net/bugs/2086706

Title:
  gnome-flashback crashes on idle

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