Description of problem: I 've just changed display brightness Version-Release number of selected component: xfce4-panel-4.12.0-4.fc23 Additional info: reporter: libreport-2.6.3 backtrace_rating: 4 cmdline: /usr/lib64/xfce4/panel/wrapper-2.0 /usr/lib64/xfce4/panel/plugins/libxfce4powermanager.so 17 23080279 power-manager-plugin 'Power Manager Plugin' 'Display the battery levels of your devices and control the brightness of your display' '' crash_function: _gtk_widget_run_controllers executable: /usr/lib64/xfce4/panel/wrapper-2.0 global_pid: 4251 kernel: 4.2.8-300.fc23.x86_64 runlevel: N 5 type: CCpp uid: 1000 Truncated backtrace: Thread no. 1 (10 frames) #0 _gtk_widget_run_controllers at gtkwidget.c:7304 #1 scale_menu_item_grab_broken at ../scalemenuitem.c:324 #2 scale_menu_item_button_release_event at ../scalemenuitem.c:281 #3 _gtk_marshal_BOOLEAN__BOXEDv at gtkmarshalers.c:131 #4 _g_closure_invoke_va at gclosure.c:864 #7 gtk_widget_event_internal at gtkwidget.c:7692 #8 propagate_event_up at gtkmain.c:2517 #9 propagate_event at gtkmain.c:2619 #10 gtk_main_do_event at gtkmain.c:1850 #16 gtk_main at gtkmain.c:1241
Created attachment 1109437 [details] File: backtrace
Created attachment 1109438 [details] File: cgroup
Created attachment 1109439 [details] File: core_backtrace
Created attachment 1109440 [details] File: dso_list
Created attachment 1109441 [details] File: environ
Created attachment 1109442 [details] File: exploitable
Created attachment 1109443 [details] File: limits
Created attachment 1109444 [details] File: maps
Created attachment 1109445 [details] File: mountinfo
Created attachment 1109446 [details] File: namespaces
Created attachment 1109447 [details] File: open_fds
Created attachment 1109448 [details] File: proc_pid_status
Created attachment 1109449 [details] File: var_log_messages
Did you by chance change it to 0 or 100% ?
(In reply to Kevin Fenzi from comment #14) > Did you by chance change it to 0 or 100% ? It needn't be 0 or 100% I'm able to reproduce when I click somewhere to slider instead of moving with circle. But sometime I'm able to reproduce even with moving a circle on slider. If you nedd any additional data abour hardware or something else I will be glad to provide them.
If you need a coredump I can provide it.
Created attachment 1118472 [details] Output from valgrind This seems to be a de-reference of NULL pointer.
sh$ rpm -q gtk3 xfce4-panel xfce4-power-manager gtk3-3.18.6-1.fc23.x86_64 xfce4-panel-4.12.0-4.fc23.x86_64 xfce4-power-manager-1.5.2-1.fc23.x86_64
Does it help? or do you need to see a coredump?
Created attachment 1118473 [details] xfce-panel valgrind output I can also see a use after free in xfce-panel but it should not be related. It's a different process.
Can you try this scratch build: https://koji.fedoraproject.org/koji/taskinfo?taskID=12682519 from bug 1278746 and see if the problem persists?
It works for me and there isn't any valgrind error. You can close this bug as duplicate.
*** This bug has been marked as a duplicate of bug 1278746 ***