Description of problem: This is reproducer of bug 1318615 Version-Release number of selected component: gnome-initial-setup-3.20.1-1.fc24 Additional info: reporter: libreport-2.7.1 backtrace_rating: 4 cmdline: /usr/libexec/gnome-initial-setup crash_function: g_time_zone_ref executable: /usr/libexec/gnome-initial-setup global_pid: 1275 kernel: 4.5.5-300.fc24.x86_64 pkg_fingerprint: 73BD E983 81B4 6521 pkg_vendor: Fedora Project runlevel: unknown type: CCpp uid: 986 Truncated backtrace: Thread no. 1 (10 frames) #0 g_time_zone_ref at gtimezone.c:267 #1 g_date_time_alloc at gdatetime.c:429 #2 g_date_time_from_instant at gdatetime.c:524 #3 g_date_time_new_from_timeval at gdatetime.c:647 #4 g_date_time_new_now at gdatetime.c:705 #5 update_clock at gnome-wall-clock.c:350 #6 g_cclosure_marshal_VOID__STRINGv at gmarshal.c:1794 #7 _g_closure_invoke_va at gclosure.c:867 #10 g_settings_real_change_event at gsettings.c:386 #11 ffi_call_unix64 at ../src/x86/unix64.S:76
Created attachment 1173473 [details] File: backtrace
Created attachment 1173474 [details] File: cgroup
Created attachment 1173475 [details] File: core_backtrace
Created attachment 1173476 [details] File: dso_list
Created attachment 1173477 [details] File: environ
Created attachment 1173478 [details] File: exploitable
Created attachment 1173479 [details] File: limits
Created attachment 1173480 [details] File: maps
Created attachment 1173481 [details] File: mountinfo
Created attachment 1173482 [details] File: namespaces
Created attachment 1173483 [details] File: open_fds
Created attachment 1173484 [details] File: proc_pid_status
Created attachment 1173485 [details] File: var_log_messages
*** Bug 1318615 has been marked as a duplicate of this bug. ***
Some random gsettings key ("cursor-blink-timeout") changed on the schema org.gnome.desktop.interface, triggering the on_schema_change callback that calls update_clock. But priv->timezone is NULL at the time, and update_clock is not prepared to handle that case, causing the crash when it's passed to g_date_time_new_now. Problem is, priv->timezone should never be NULL there and I don't see how it could have happened. priv->timezone is initialized in _init and can't possibly become invalid until the wall clock is finalized, but by that point the settings watch would have already been disconnected (by unreffing the GSettings object in dispose) and so on_schema_changed could never be called. It might be a bit safer to use g_signal_connect_object there, but it shouldn't matter since nothing else ever refs the GSettings object. So I don't see it.
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