Created attachment 637131 [details]
backtrace

It seems that gdm have recently died several times with following:
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000000000420b31 in gdm_session_worker_job_spawn (name=0x2606c00
"`���^\002", session_worker_job=0x26198d0) at gdm-session-worker-job.c:295
295     gdm-session-worker-job.c: Permission denied.
(gdb) bt
#0  0x0000000000420b31 in gdm_session_worker_job_spawn (name=0x2606c00
"`���^\002", session_worker_job=0x26198d0) at gdm-session-worker-job.c:295
#1  gdm_session_worker_job_start (session_worker_job=0x26198d0,
name=name@entry=0x26194a0 "gdm-session-worker [pam/gdm-launch-environment]") at
gdm-session-worker-job.c:324
#2  0x000000000041d502 in start_conversation (service_name=0x440c28
"gdm-launch-environment", self=0x26036a0) at gdm-session.c:1851
#3  gdm_session_start_conversation (self=0x26036a0,
service_name=service_name@entry=0x440c28 "gdm-launch-environment") at
gdm-session.c:1924
#4  0x0000000000414fed in gdm_launch_environment_start
(launch_environment=0x24ad1c0) at gdm-launch-environment.c:509
#5  0x000000000041267c in gdm_display_start_greeter_session
(self=self@entry=0x1ccb820) at gdm-display.c:1509
#6  0x000000000041779a in set_up_greeter_session (display=0x1ccb820,
manager=0x1ccb220) at gdm-manager.c:1779
#7  on_display_status_changed (display=0x1ccb820, arg1=<optimized out>,
manager=0x1ccb220) at gdm-manager.c:1834
#8  0x00007f709a15a018 in g_closure_invoke (closure=0x261a6b0,
return_value=0x0, n_param_values=2, param_values=0x7ffc15e42c50,
invocation_hint=0x7ffc15e42bf0) at gclosure.c:768
#9  0x00007f709a16b22d in signal_emit_unlocked_R (node=node@entry=0x1cbbdf0,
detail=detail@entry=240, instance=instance@entry=0x1ccb820,
emission_return=emission_return@entry=0x0, 
    instance_and_params=instance_and_params@entry=0x7ffc15e42c50) at
gsignal.c:3549
#10 0x00007f709a172da8 in g_signal_emit_valist (instance=<optimized out>,
signal_id=<optimized out>, detail=<optimized out>,
var_args=var_args@entry=0x7ffc15e42de8) at gsignal.c:3305
#11 0x00007f709a173062 in g_signal_emit (instance=<optimized out>,
signal_id=<optimized out>, detail=<optimized out>) at gsignal.c:3361
#12 0x00007f709a15e3a5 in g_object_dispatch_properties_changed
(object=0x1ccb820, n_pspecs=16, pspecs=0x0) at gobject.c:1056
#13 0x00007f709a160793 in g_object_notify_by_spec_internal (pspec=<optimized
out>, object=0x1ccb820) at gobject.c:1150
#14 g_object_notify (object=0x1ccb820,
property_name=property_name@entry=0x43f7ae "status") at gobject.c:1197
#15 0x000000000041030b in _gdm_display_set_status (self=self@entry=0x1ccb820,
status=status@entry=1) at gdm-display.c:527
#16 0x00000000004106a0 in gdm_display_real_prepare (self=0x1ccb820) at
gdm-display.c:538
#17 0x00000000004137e1 in gdm_local_display_prepare (display=0x1ccb820) at
gdm-local-display.c:143
#18 0x0000000000411df1 in gdm_display_prepare (self=self@entry=0x1ccb820) at
gdm-display.c:601
#19 0x0000000000411f3f in gdm_display_manage (self=self@entry=0x1ccb820) at
gdm-display.c:618
#20 0x000000000040f2ca in create_display (factory=factory@entry=0x1cd6af0,
seat_id=0x2614dd0 "seat0", session_type=0x25bfa40 "wayland", initial=1) at
gdm-local-display-factory.c:427
#21 0x000000000040f4e5 in on_display_status_changed (display=0x1ccb420,
arg1=<optimized out>, factory=0x1cd6af0) at gdm-local-display-factory.c:320
#22 0x00007f709a15a018 in g_closure_invoke (closure=0x2600300,
return_value=0x0, n_param_values=2, param_values=0x7ffc15e43230,
invocation_hint=0x7ffc15e431d0) at gclosure.c:768
#23 0x00007f709a16b22d in signal_emit_unlocked_R (node=node@entry=0x1cbbdf0,
detail=detail@entry=240, instance=instance@entry=0x1ccb420,
emission_return=emission_return@entry=0x0, 
    instance_and_params=instance_and_params@entry=0x7ffc15e43230) at
gsignal.c:3549
#24 0x00007f709a172da8 in g_signal_emit_valist (instance=<optimized out>,
signal_id=<optimized out>, detail=<optimized out>,
var_args=var_args@entry=0x7ffc15e433c8) at gsignal.c:3305
#25 0x00007f709a173062 in g_signal_emit (instance=<optimized out>,
signal_id=<optimized out>, detail=<optimized out>) at gsignal.c:3361
#26 0x00007f709a15e3a5 in g_object_dispatch_properties_changed
(object=0x1ccb420, n_pspecs=16, pspecs=0x0) at gobject.c:1056
#27 0x00007f709a160793 in g_object_notify_by_spec_internal (pspec=<optimized
out>, object=0x1ccb420) at gobject.c:1150
#28 g_object_notify (object=0x1ccb420,
property_name=property_name@entry=0x43f7ae "status") at gobject.c:1197
#29 0x000000000041030b in _gdm_display_set_status (self=self@entry=0x1ccb420,
status=status@entry=3) at gdm-display.c:527
#30 0x0000000000411fe8 in gdm_display_finish (self=0x1ccb420) at
gdm-display.c:645
#31 0x0000000000412034 in finish_idle (self=<optimized out>) at
gdm-display.c:509
#32 0x00007f7099e85b55 in g_main_dispatch (context=0x1ccc950) at gmain.c:3122
#33 g_main_context_dispatch (context=context@entry=0x1ccc950) at gmain.c:3737
#34 0x00007f7099e85ec8 in g_main_context_iterate (context=0x1ccc950,
block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at
gmain.c:3808
#35 0x00007f7099e8618a in g_main_loop_run (loop=0x1cd9190) at gmain.c:4002
#36 0x000000000040ca16 in main (argc=1, argv=0x7ffc15e437f8) at main.c:426