$ cat /etc/fedora-release 
Fedora release 24 (Twenty Four)

$ rpm -q xfce4-panel gtk3 glib2
xfce4-panel-4.13.0-2.20161024git33d058b.fc24.x86_64
gtk3-3.20.9-2.fc24.x86_64
glib2-2.48.2-1.fc24.x86_64

$ cd xfce4-mount-plugin/
$ git shortlog -1
Fabian (1):
      increase version to 1.1.2 git again


$ PANEL_DEBUG=gdb xfce4-panel
...
Add / Remove 'xfce4-mount-plugin'
...

$ cat /tmp/1487884690_gdb_xfce4-mount-plugin_29.log
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffe410a700 (LWP 2255)]
[New Thread 0x7fffe3909700 (LWP 2256)]
[Thread 0x7fffe3909700 (LWP 2256) exited]
[Thread 0x7fffe410a700 (LWP 2255) exited]
[Inferior 1 (process 2248) exited normally]
No stack.
The program has no registers now.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ cat /etc/fedora-release
Fedora release 26 (Rawhide)

$ rpm -q xfce4-panel gtk3 glib2
xfce4-panel-4.13.0-2.20161024git33d058b.fc26.x86_64
gtk3-3.22.8-2.fc26.x86_64
glib2-2.51.2-1.fc26.x86_64

$ cd xfce4-mount-plugin/
$ git shortlog -1
Fabian (1):
      increase version to 1.1.2 git again


$ PANEL_DEBUG=gdb xfce4-panel
...
Add / Remove 'xfce4-mount-plugin'
...

$ cat /tmp/1487885354_gdb_xfce4-mount-plugin_6.log
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffebc72700 (LWP 6717)]
[New Thread 0x7fffeb471700 (LWP 6718)]

Thread 1 "panel-6-xfce4-m" received signal SIGSEGV, Segmentation fault.
0x00007ffff66269f2 in g_type_check_instance_cast () from /lib64/libgobject-2.0.so.0
#0  0x00007ffff66269f2 in g_type_check_instance_cast () at /lib64/libgobject-2.0.so.0
#1  0x00007ffff7bc8c8d in xfce_panel_plugin_finalize () at /lib64/libxfce4panel-2.0.so.4
#2  0x00007ffff6605239 in g_object_unref () at /lib64/libgobject-2.0.so.0
#3  0x00007ffff7641929 in gtk_window_forall () at /lib64/libgtk-3.so.0
#4  0x00007ffff741b0ee in gtk_container_destroy () at /lib64/libgtk-3.so.0
#5  0x00007ffff660047d in g_closure_invoke () at /lib64/libgobject-2.0.so.0
#6  0x00007ffff6613512 in signal_emit_unlocked_R () at /lib64/libgobject-2.0.so.0
#7  0x00007ffff661c0b5 in g_signal_emit_valist () at /lib64/libgobject-2.0.so.0
#8  0x00007ffff661ca0f in g_signal_emit () at /lib64/libgobject-2.0.so.0
#9  0x00007ffff76355e0 in gtk_widget_dispose () at /lib64/libgtk-3.so.0
#10 0x00007ffff7648d18 in gtk_window_dispose () at /lib64/libgtk-3.so.0
#11 0x00007ffff6606c3c in g_object_run_dispose () at /lib64/libgobject-2.0.so.0
#12 0x0000555555557343 in main ()
rax            0x5555557b0f60	93824994709344
rbx            0x555555b0d9a0	93824998234528
rcx            0x0	0
rdx            0x0	0
rsi            0x5555557b0f60	93824994709344
rdi            0xaaaaaaaaaaaaaaaa	-6148914691236517206
rbp            0x5555557ec1c0	0x5555557ec1c0
rsp            0x7fffffffd830	0x7fffffffd830
r8             0x5555557e93b0	93824994939824
r9             0x6	6
r10            0x40	64
r11            0x5555557e93b0	93824994939824
r12            0x5555557ec1c8	93824994951624
r13            0x5555557ec1c0	93824994951616
r14            0x7ffff6844240	140737329250880
r15            0x0	0
rip            0x7ffff66269f2	0x7ffff66269f2 <g_type_check_instance_cast+34>
eflags         0x10286	[ PF SF IF RF ]
cs             0x33	51
ss             0x2b	43
ds             0x0	0
es             0x0	0
fs             0x0	0
gs             0x0	0