gdb) run
Starting program: /usr/bin/lxqt-panel
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffef038700 (LWP 1659)]

(lxqt-panel:1655): Gtk-WARNING **: Unable to locate theme engine in module_path: "adwaita",

(lxqt-panel:1655): Gtk-WARNING **: Unable to locate theme engine in module_path: "adwaita",

(lxqt-panel:1655): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(lxqt-panel:1655): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(lxqt-panel:1655): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(lxqt-panel:1655): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",
[New Thread 0x7fffe4653700 (LWP 1660)]
[Thread 0x7fffe4653700 (LWP 1660) exited]
[New Thread 0x7fffe3e52700 (LWP 1661)]
[New Thread 0x7fffe4653700 (LWP 1662)]
[New Thread 0x7fffe2e1e700 (LWP 1663)]
[New Thread 0x7fffe261d700 (LWP 1664)]
[New Thread 0x7fffd394d700 (LWP 1665)]
[Thread 0x7fffe261d700 (LWP 1664) exited]
[New Thread 0x7fffe0bc5700 (LWP 1666)]
[New Thread 0x7fffd314c700 (LWP 1667)]
[New Thread 0x7fffd294b700 (LWP 1668)]
[New Thread 0x7fffd214a700 (LWP 1669)]
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 20 (X_GetProperty)
  Resource id:  0x0
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 20 (X_GetProperty)
  Resource id:  0x0
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 20 (X_GetProperty)
  Resource id:  0x0
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 20 (X_GetProperty)
  Resource id:  0x0
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 20 (X_GetProperty)
  Resource id:  0x0
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 20 (X_GetProperty)
  Resource id:  0x0
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 3 (X_GetWindowAttributes)
  Resource id:  0x0
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 2 (X_ChangeWindowAttributes)
  Resource id:  0x0
[New Thread 0x7fffd1949700 (LWP 1670)]
[New Thread 0x7fffd0f3c700 (LWP 1671)]
[New Thread 0x7fffbffff700 (LWP 1672)]
settingsChanged "Alsa"
[New Thread 0x7fffbddf8700 (LWP 1673)]
LxQt::RotatedWidget(0xbc69f0)  does not have a property named  "iconSize"
LxQt::RotatedWidget(0xbc69f0)  does not have a property named  "iconSize"
DesktopSwitchWidget(0x905ff0, name = "DesktopSwitch")  does not have a property named  "iconSize"
LxQtQuickLaunch(0x9134a0, name = "QuickLaunch")  does not have a property named  "iconSize"
LxQtTaskBar(0xb42440, name = "TaskBar")  does not have a property named  "iconSize"
QWidget(0xbcb800, name = "Clock")  does not have a property named  "iconSize"
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 18 (X_ChangeProperty)
  Resource id:  0x0
Another systray is running
** Dbus error **************************
Error name  "org.freedesktop.DBus.Error.InvalidArgs"
Error msg   "No such property CanHibernate"
****************************************
systemd: "CanHibernate" = "yes"
** Dbus error **************************
Error name  "org.freedesktop.DBus.Error.InvalidArgs"
Error msg   "No such property CanSuspend"
****************************************
systemd: "CanSuspend" = "yes"
dbusCall: QDBusInterface is invalid "org.freedesktop.ConsoleKit" "/org/freedesktop/ConsoleKit/Manager" "org.freedesktop.ConsoleKit.Manager" "CanRestart"
systemd: "CanReboot" = "yes"
dbusCall: QDBusInterface is invalid "org.freedesktop.ConsoleKit" "/org/freedesktop/ConsoleKit/Manager" "org.freedesktop.ConsoleKit.Manager" "CanStop"
systemd: "CanPowerOff" = "yes"
** Dbus error **************************
Error name  "org.freedesktop.DBus.Error.InvalidArgs"
Error msg   "No such property CanHibernate"
****************************************
systemd: "CanHibernate" = "yes"
** Dbus error **************************
Error name  "org.freedesktop.DBus.Error.InvalidArgs"
Error msg   "No such property CanSuspend"
****************************************
systemd: "CanSuspend" = "yes"
dbusCall: QDBusInterface is invalid "org.freedesktop.ConsoleKit" "/org/freedesktop/ConsoleKit/Manager" "org.freedesktop.ConsoleKit.Manager" "CanRestart"
systemd: "CanReboot" = "yes"
dbusCall: QDBusInterface is invalid "org.freedesktop.ConsoleKit" "/org/freedesktop/ConsoleKit/Manager" "org.freedesktop.ConsoleKit.Manager" "CanStop"
systemd: "CanPowerOff" = "yes"
XdgCachedMenu(0xd95150, name = "TopLevelMainMenu")  does not have a property named  "iconSize"

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff71e004d in QAbstractButton::setChecked(bool) () from /usr/lib/libQtGui.so.4
(gdb) bt
#0  0x00007ffff71e004d in QAbstractButton::setChecked(bool) () from /usr/lib/libQtGui.so.4
#1  0x00007fffe01c0bec in ?? () from /usr/lib/lxqt-panel/libdesktopswitch.so
#2  0x000000000041176c in LxQtPanel::x11EventFilter(_XEvent*) ()
#3  0x00000000004168cb in ?? ()
#4  0x00007ffff6e98d5c in ?? () from /usr/lib/libQtGui.so.4
#5  0x00007ffff6ea6eb9 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#6  0x00007ffff6ecdf02 in ?? () from /usr/lib/libQtGui.so.4
#7  0x00007ffff4cb1b84 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#8  0x00007ffff4cb1dc8 in ?? () from /usr/lib/libglib-2.0.so.0
#9  0x00007ffff4cb1e6c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#10 0x00007ffff692f2a5 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQtCore.so.4
#11 0x00007ffff6ecdfb6 in ?? () from /usr/lib/libQtGui.so.4
#12 0x00007ffff690115f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#13 0x00007ffff6901455 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#14 0x00007ffff6906719 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#15 0x000000000040f653 in ?? ()
#16 0x00007ffff60e8000 in __libc_start_main () from /usr/lib/libc.so.6
#17 0x000000000040f7f2 in _start ()
(gdb)
#0  0x00007ffff71e004d in QAbstractButton::setChecked(bool) () from /usr/lib/libQtGui.so.4
#1  0x00007fffe01c0bec in ?? () from /usr/lib/lxqt-panel/libdesktopswitch.so
#2  0x000000000041176c in LxQtPanel::x11EventFilter(_XEvent*) ()
#3  0x00000000004168cb in ?? ()
#4  0x00007ffff6e98d5c in ?? () from /usr/lib/libQtGui.so.4
#5  0x00007ffff6ea6eb9 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/libQtGui.so.4
#6  0x00007ffff6ecdf02 in ?? () from /usr/lib/libQtGui.so.4
#7  0x00007ffff4cb1b84 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#8  0x00007ffff4cb1dc8 in ?? () from /usr/lib/libglib-2.0.so.0
#9  0x00007ffff4cb1e6c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#10 0x00007ffff692f2a5 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQtCore.so.4
#11 0x00007ffff6ecdfb6 in ?? () from /usr/lib/libQtGui.so.4
#12 0x00007ffff690115f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#13 0x00007ffff6901455 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#14 0x00007ffff6906719 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#15 0x000000000040f653 in ?? ()
#16 0x00007ffff60e8000 in __libc_start_main () from /usr/lib/libc.so.6
#17 0x000000000040f7f2 in _start ()
(gdb)