segfault in in on_notification_dismissed()
The bug has been reported on https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1723756
There is no clear steps described to trigger the issue but it looks like a callback not disconnected
Backtrace from 3.26.1 (but the error tracker reports shows it's still an issue with 3.30.2)
#0 on_notification_dismissed (button=button@entry=0x0, user_data=0x55f652f084b0, user_data@entry=<error reading variable: value has been optimized out>) at cc-printers-panel.c:674
priv = <optimized out>
self = 0x55f652f084b0
#1 0x000055f650aadaae in on_remove_printer_timeout (user_data=<error reading variable: value has been optimized out>) at cc-printers-panel.c:693
No locals.
#2 0x00007fc80cf718a3 in g_timeout_dispatch (source=source@entry=0x55f6522a23f0, callback=<optimized out>, user_data=<optimized out>) at ../../../../glib/gmain.c:4633
timeout_source = 0x55f6522a23f0
again = <optimized out>
#3 0x00007fc80cf70e25 in g_main_dispatch (context=0x55f65149cd10) at ../../../../glib/gmain.c:3148
dispatch = 0x7fc80cf71890 <g_timeout_dispatch>
prev_source = 0x0
was_in_call = 0
user_data = 0x55f652f084b0
callback = 0x55f650aadaa0 <on_remove_printer_timeout>
cb_funcs = 0x7fc80d238280 <g_source_callback_funcs>
cb_data = 0x55f652bb65d0
need_destroy = <optimized out>
source = 0x55f6522a23f0
current = 0x55f651520c90
i = 0
#4 g_main_context_dispatch (context=context@entry=0x55f65149cd10) at ../../../../glib/gmain.c:3813
No locals.
#5 0x00007fc80cf711f0 in g_main_context_iterate (context=context@entry=0x55f65149cd10, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../../glib/gmain.c:3886
max_priority = 2147483647
timeout = 2344
some_ready = 1
nfds = <optimized out>
allocated_nfds = 8
fds = 0x55f65232e400
#6 0x00007fc80cf7127c in g_main_context_iteration (context=context@entry=0x55f65149cd10, may_block=may_block@entry=1) at ../../../../glib/gmain.c:3947
retval = <optimized out>
#7 0x00007fc80d52ec4d in g_application_run (application=0x55f651ada460, argc=<optimized out>, argv=<optimized out>) at ../../../../gio/gapplication.c:2401
arguments = 0x55f651d4cf00
status = 0
context = 0x55f65149cd10
acquired_context = <optimized out>
__func__ = "g_application_run"
#8 0x000055f650a08891 in main (argc=<optimized out>, argv=<optimized out>) at main.c:57
application = 0x55f651ada460
status = <optimized out>