what is going on here?

see the following backtrace:

```
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /home/fortysixandtwo/install/bin/gnome-calls -p sip
Start it from the beginning? (y or n) [Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff204b700 (LWP 1035837)]
[New Thread 0x7ffff184a700 (LWP 1035838)]
[New Thread 0x7ffff0ff9700 (LWP 1035839)]
[New Thread 0x7fffe3fff700 (LWP 1035840)]

Thread 1 "gnome-calls" hit Breakpoint 1, calls_account_manager_init (
    self=0x7fffe4010920 [CallsAccountManager]) at ../src/calls-account-manager.c:252
252       self->credentials = g_list_store_new (CALLS_TYPE_CREDENTIALS);
(gdb) n
257       g_print ("init: context %p thread %p\n", g_main_context_get_thread_default (), g_thread_self ());
(gdb) p (GObject)*self->credentials
$9 = {g_type_instance = {g_class = 0x555555600980 [g_type: GListStore]}, ref_count = 1, qdata = 0x0}
(gdb) x/a self->credentials
0x555555630080: 0x555555600cd0
(gdb) bt
    at ../src/calls-account-manager.c:257
    (class=class@entry=0x555555637e10, params=params@entry=0x0, n_params=n_params@entry=0)
    at ../../../gobject/gobject.c:1939
    (object_type=0x555555637d20 [CallsAccountManager], n_properties=0, names=names@entry=0x0, values=values@entry=0x0) at ../../../gobject/gobject.c:2107
    (object_type=<optimized out>, first_property_name=first_property_name@entry=0x0)
    at ../../../gobject/gobject.c:1779
    at ../src/calls-manager.c:714
    (class=class@entry=0x555555601120, params=params@entry=0x0, n_params=n_params@entry=0)
    at ../../../gobject/gobject.c:1939
    (object_type=0x555555600f30 [CallsManager], n_properties=0, names=names@entry=0x0, values=values@entry=0x0) at ../../../gobject/gobject.c:2107
    (object_type=<optimized out>, first_property_name=first_property_name@entry=0x0)
    at ../../../gobject/gobject.c:1779
    at ../src/calls-dbus-manager.c:166
    (class=class@entry=0x5555555fe9d0, params=params@entry=0x0, n_params=n_params@entry=0)
    at ../../../gobject/gobject.c:1979
    (object_type=0x5555555fe8e0 [CallsDBusManager], n_properties=0, names=names@entry=0x0, values=values@entry=0x0) at ../../../gobject/gobject.c:2107
    (object_type=<optimized out>, first_property_name=first_property_name@entry=0x0)
    at ../../../gobject/gobject.c:1779
--Type <RET> for more, q to quit, c to continue without paging--
    (application=0x5555555da0f0 [CallsApplication], connection=0x5555555ea0a0 [GDBusConnection], object_path=0x7fffe4006400 "/sm/puri/Calls", error=0x7fffffffe248) at ../src/calls-application.c:93
    (error=0x7fffffffe248, cancellable=0x0, impl=0x5555555e0400)
    at ../../../gio/gapplicationimpl-dbus.c:430
    (application=application@entry=0x5555555da0f0 [CallsApplication], appid=0x5555555dbf40 "sm.puri.Calls", flags=G_APPLICATION_HANDLES_OPEN, exported_actions=<optimized out>, remote_actions=remote_actions@entry=0x5555555da098, cancellable=cancellable@entry=0x0, error=0x7fffffffe248)
    at ../../../gio/gapplicationimpl-dbus.c:619
    (application=application@entry=0x5555555da0f0 [CallsApplication], cancellable=cancellable@entry=0x0, error=error@entry=0x7fffffffe248) at ../../../gio/gapplication.c:2187
    (application=application@entry=0x5555555da0f0 [CallsApplication], options=options@entry=0x5555555cf420) at ../src/calls-application.c:123
    (closure=0x5555555d6590, return_value=0x7fffffffe410, instance=<optimized out>, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized out>, param_types=0x5555555d65e0)
    at ../../../gio/gmarshal-internal.c:758
    (closure=closure@entry=0x5555555d6590, return_value=return_value@entry=0x7fffffffe410, instance=instance@entry=0x5555555da0f0, args=args@entry=0x7fffffffe4e0, n_params=1, param_types=0x5555555d65e0)
    at ../../../gobject/gclosure.c:873
    (instance=0x5555555da0f0, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fffffffe4e0) at ../../../gobject/gsignal.c:3404
    (instance=instance@entry=0x5555555da0f0, signal_id=<optimized out>, detail=detail@entry=0)
    at ../../../gobject/gsignal.c:3551
    (application=0x5555555da0f0 [CallsApplication], arguments=0x7fffffffe638, exit_status=0x7fffffffe634)
    at ../../../gio/gapplication.c:1098
    (application=application@entry=0x5555555da0f0 [CallsApplication], argc=-6604,
    argc@entry=3, argv=argv@entry=0x7fffffffe798) at ../../../gio/gapplication.c:2528
--Type <RET> for more, q to quit, c to continue without paging--
(gdb) c
Continuing.
init: context (nil) thread 0x5555555cff20
[Thread 0x7fffe3fff700 (LWP 1035840) exited]
[New Thread 0x7fffe3fff700 (LWP 1035932)]
su_source_port_create() returns 0x555555734120

Thread 1 "gnome-calls" hit Breakpoint 2, update_state (self=0x7fffe4010920 [CallsAccountManager])
    at ../src/calls-account-manager.c:162
162       g_print ("update_state: context %p thread %p\n", g_main_context_get_thread_default (), g_thread_self ());
(gdb) p (GObject)*self->credentials
$10 = {g_type_instance = {g_class = 0x555555600980 [g_type: GListStore]}, ref_count = 1, qdata = 0x0}
(gdb) x/a self->credentials
0x555555630080: 0x555555600cd0
(gdb) bt
    (self=0x7fffe4010920 [CallsAccountManager], provider=0x5555558c1480)
    at ../src/calls-account-manager.c:292
    at ../src/calls-manager.c:531
    (action=<optimized out>, parameter=<optimized out>, user_data=<optimized out>)
    at ../src/calls-application.c:197
    (instance=instance@entry=0x5555558bd0a0, signal_id=<optimized out>, detail=detail@entry=0)
    at ../../../gobject/gsignal.c:3551
    #4  0x00007ffff7f5d0a2 in g_closure_invoke
    (closure=0x555555703cc0, return_value=return_value@entry=0x0, n_param_values=2, param_values=param_values@entry=0x7fffffffdf70, invocation_hint=invocation_hint@entry=0x7fffffffdef0)
    at ../../../gobject/gclosure.c:810
    #5  0x00007ffff7f6f413 in signal_emit_unlocked_R
    (node=node@entry=0x555555719660, detail=detail@entry=0, instance=instance@entry=0x5555558bd0a0, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fffffffdf70)
    at ../../../gobject/gsignal.c:3739
    #6  0x00007ffff7f756cf in g_signal_emit_valist
    (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fffffffe110) at ../../../gobject/gsignal.c:3495
    at ../../../gio/gsimpleaction.c:225
    at ../../../gio/gaction.c:397
    (application=application@entry=0x5555555da0f0 [CallsApplication], options=options@entry=0x5555555cf420) at ../src/calls-application.c:139
    (closure=0x5555555d6590, return_value=0x7fffffffe410, instance=<optimized out>, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized out>, param_types=0x5555555d65e0)
    at ../../../gio/gmarshal-internal.c:758
    (closure=closure@entry=0x5555555d6590, return_value=return_value@entry=0x7fffffffe410, instance=instance@entry=0x5555555da0f0, args=args@entry=0x7fffffffe4e0, n_params=1, param_types=0x5555555d65e0)
    at ../../../gobject/gclosure.c:873
--Type <RET> for more, q to quit, c to continue without paging--
    (instance=0x5555555da0f0, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fffffffe4e0) at ../../../gobject/gsignal.c:3404
    (instance=instance@entry=0x5555555da0f0, signal_id=<optimized out>, detail=detail@entry=0)
    at ../../../gobject/gsignal.c:3551
    (application=0x5555555da0f0 [CallsApplication], arguments=0x7fffffffe638, exit_status=0x7fffffffe634)
    at ../../../gio/gapplication.c:1098
    (application=application@entry=0x5555555da0f0 [CallsApplication], argc=-6604,
    argc@entry=3, argv=argv@entry=0x7fffffffe798) at ../../../gio/gapplication.c:2528

<snip>

Thread 1 "gnome-calls" hit Breakpoint 3, find_credentials (
    self=self@entry=0x7fffe4010920 [CallsAccountManager],
    uuid=uuid@entry=0x5555564d2150 "d8561910-2e55-4467-8bf2-d1bc9ed85d0b", position=position@entry=0x0)
    at ../src/calls-account-manager.c:78
78        g_print ("find_credentials: context %p thread %p\n", g_main_context_get_thread_default (), g_thread_self ());
(gdb) p (GObject)*self->credentials
$11 = {g_type_instance = {g_class = <error reading variable: Cannot access memory at address 0x4e5f>},
  ref_count = 0, qdata = 0x0}
(gdb) x/a self->credentials
0x555555630080: 0x4e5f
(gdb) bt
    (self=self@entry=0x7fffe4010920 [CallsAccountManager], uuid=uuid@entry=0x5555564d2150 "d8561910-2e55-4467-8bf2-d1bc9ed85d0b", position=position@entry=0x0) at ../src/calls-account-manager.c:78
    (self=0x7fffe4010920 [CallsAccountManager], credentials=credentials@entry=0x55555689b800 [CallsCredentials]) at ../src/calls-account-manager.c:360
    at ../src/calls-account-overview.c:389
    (closure=closure@entry=0x555556799c30, return_value=return_value@entry=0x0, instance=instance@entry=0x555556707a40, args=args@entry=0x7fffffffd510, n_params=0, param_types=0x0)
    at ../../../gobject/gclosure.c:873
    (instance=0x555556707a40, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7fffffffd510) at ../../../gobject/gsignal.c:3404
    (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>)
    at ../../../gobject/gsignal.c:3551
    (closure=closure@entry=0x5555557ac520, return_value=return_value@entry=0x0, instance=instance@entry=0x555556707a40, args=args@entry=0x7fffffffd830, n_params=0, param_types=0x0)
    at ../../../gobject/gclosure.c:873
    (instance=0x555556707a40, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7fffffffd830) at ../../../gobject/gsignal.c:3404
    (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>)
    at ../../../gobject/gsignal.c:3551
    (closure=closure@entry=0x55555676bd50, return_value=return_value@entry=0x0, instance=instance@entry=0x55555670ee70, args=args@entry=0x7fffffffdb50, n_params=3, param_types=0x5555557b9340)
    at ../../../gobject/gclosure.c:873
    (instance=0x55555670ee70, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7fffffffdb50) at ../../../gobject/gsignal.c:3404
--Type <RET> for more, q to quit, c to continue without paging--
    (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>)
    at ../../../gobject/gsignal.c:3551
    (closure=0x5555556cfa90, return_value=<optimized out>, instance=<optimized out>, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized out>, param_types=0x5555556faf00)
    at ../../../gobject/gmarshal.c:1686
    (closure=closure@entry=0x5555556cfa90, return_value=return_value@entry=0x0, instance=instance@entry=0x55555670ee70, args=args@entry=0x7fffffffded0, n_params=1, param_types=0x5555556faf00)
    at ../../../gobject/gclosure.c:873
    (instance=0x55555670ee70, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7fffffffded0) at ../../../gobject/gsignal.c:3404
    (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>)
    at ../../../gobject/gsignal.c:3551
    (closure=closure@entry=0x55555566e630, return_value=return_value@entry=0x7fffffffe250, instance=instance@entry=0x555556707a40, args=args@entry=0x7fffffffe320, n_params=1, param_types=0x55555568a3c0)
    at ../../../gobject/gclosure.c:873
    (instance=0x555556707a40, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fffffffe320) at ../../../gobject/gsignal.c:3404
    (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>)
    at ../../../gobject/gsignal.c:3551
--Type <RET> for more, q to quit, c to continue without paging--
    (context=context@entry=0x5555555dbfc0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4119
    (context=context@entry=0x5555555dbfc0, may_block=may_block@entry=1) at ../../../glib/gmain.c:4184
    (application=application@entry=0x5555555da0f0 [CallsApplication], argc=-6604,
    argc@entry=3, argv=argv@entry=0x7fffffffe798) at ../../../gio/gapplication.c:2559
(gdb) c
Continuing.
find_credentials: context (nil) thread 0x5555555cff20
[Thread 0x7fffd2669700 (LWP 1036265) exited]

Thread 1 "gnome-calls" received signal SIGSEGV, Segmentation fault.
g_type_check_instance_cast (type_instance=type_instance@entry=0x555555630080,
    iface_type=0x555555600a90 [GListModel]) at ../../../gobject/gtype.c:4061
4061    ../../../gobject/gtype.c: No such file or directory.
```
8 jobs for wip/ui-manage-accounts in 10 minutes and 44 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #353607
librem5
build:native

00:02:03

 
  Test
passed #353609
librem5
build-gtkdoc

00:02:12

passed #353610
librem5
check-po

00:00:26

passed #353608
librem5
test:native

00:02:08

24.4%
 
  Package
passed #353611
librem5
package-pureos-byzantium

00:02:05

passed #353612
librem5:arm64
package-pureos-byzantium:arm64

00:06:28

 
  Test Package
passed #353613
librem5
autopkgtest-pureos-byzantium-package

00:01:15

passed #353614
librem5
lintian-pureos-byzantium-package

00:00:42