[Xfce-bugs] [Bug 16657] New: SIGSEGV in `xfsm_manager_get_shutdown_type()`

[bugzilla-daemon at xfce.org]

https://bugzilla.xfce.org/show_bug.cgi?id=16657

            Bug ID: 16657
           Summary: SIGSEGV in `xfsm_manager_get_shutdown_type()`
    Classification: Xfce Core
           Product: Xfce4-session
           Version: Unspecified
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Medium
         Component: General
          Assignee: xfce-bugs at xfce.org
          Reporter: pmenzel+bugzilla.xfce.org at molgen.mpg.de
  Target Milestone: Xfce 4.14

Created attachment 9687
  --> https://bugzilla.xfce.org/attachment.cgi?id=9687&action=edit
(gdb) t a a bt f

xfce4-session 4.14.2 (and 4.14.0) crash, when a VNC server is used and there
seems to be an issue regarding the X_DISPLAY.

```
Program terminated with signal SIGSEGV, Segmentation fault.
#0  xfsm_manager_get_shutdown_type (manager=manager at entry=0x0)
    at
/dev/shm/bee-root/xfce4-session/xfce4-session-4.14.2-0/source/xfce4-session/xfsm-manager.c:1931
1931      return manager->shutdown_type;
[Current thread is 1 (Thread 0x7fbe774ef980 (LWP 4882))]
(gdb) bt
#0  0x0000000000426470 in xfsm_manager_get_shutdown_type
(manager=manager at entry=0x0)
    at
/dev/shm/bee-root/xfce4-session/xfce4-session-4.14.2-0/source/xfce4-session/xfsm-manager.c:1931
#1  0x0000000000419fd0 in name_lost (connection=<optimized out>,
name=<optimized out>, user_data=<optimized out>)
    at
/dev/shm/bee-root/xfce4-session/xfce4-session-4.14.2-0/source/xfce4-session/main.c:228
#2  0x00007fbe7dc9df06 in do_call (client=0x5fca80,
call_type=CALL_TYPE_NAME_LOST) at ../source/gio/gdbusnameowning.c:215
#3  0x00007fbe7dc9e2b0 in connection_get_cb (source_object=<optimized out>,
res=0x7df570, user_data=0x5fca80) at ../source/gio/gdbusnameowning.c:491
#4  0x00007fbe7dc3f5e9 in g_task_return_now (task=0x7df570 [GTask]) at
../source/gio/gtask.c:1214
#5  0x00007fbe7dc40123 in g_task_return (task=0x7df570 [GTask], type=<optimized
out>) at ../source/gio/gtask.c:1283
#6  0x00007fbe7dc40bf6 in g_task_return (type=G_TASK_RETURN_ERROR,
task=<optimized out>) at ../source/gio/gtask.c:1868
#7  0x00007fbe7dc40bf6 in g_task_return_error (task=<optimized out>,
error=<optimized out>) at ../source/gio/gtask.c:1867
#8  0x00007fbe7dc90b30 in bus_get_async_initable_cb (source_object=0x49f5a0
[GDBusConnection], res=0x7df630, user_data=user_data at entry=0x7df570)
    at ../source/gio/gdbusconnection.c:7357
#9  0x00007fbe7dc3f5e9 in g_task_return_now (task=0x7df630 [GTask]) at
../source/gio/gtask.c:1214
#10 0x00007fbe7dc3f629 in complete_in_idle_cb (task=0x7df630) at
../source/gio/gtask.c:1228
#11 0x00007fbe7dabb404 in g_main_dispatch (context=0x49d9f0) at
../source/glib/gmain.c:3309
#12 0x00007fbe7dabb404 in g_main_context_dispatch
(context=context at entry=0x49d9f0) at ../source/glib/gmain.c:3974
#13 0x00007fbe7dabb778 in g_main_context_iterate (context=0x49d9f0,
block=block at entry=1, dispatch=dispatch at entry=1, self=<optimized out>)
    at ../source/glib/gmain.c:4047
#14 0x00007fbe7dabba32 in g_main_loop_run (loop=0x67e0c0) at
../source/glib/gmain.c:4241
#15 0x00007fbe7e96bf05 in gtk_main () at
/dev/shm/bee-root/gtk3/gtk3-3.24.14-0/source/gtk/gtkmain.c:1325
#16 0x0000000000414458 in main (argc=<optimized out>, argv=<optimized out>)
    at
/dev/shm/bee-root/xfce4-session/xfce4-session-4.14.2-0/source/xfce4-session/main.c:367
```

Please find the full trace attached.

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