gour  debian  ~  $ gdb /usr/bin/lxqt-panel
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Reading symbols from /usr/bin/lxqt-panel...Reading symbols from /usr/lib/debug/.build-id/4a/067bf085e1b1afdd0d1128a6dd24b2dea82bad.debug...done.
done.
(gdb) run
Starting program: /usr/bin/lxqt-panel
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffeee50700 (LWP 5492)]
[New Thread 0x7fffee64f700 (LWP 5493)]
[Thread 0x7fffee64f700 (LWP 5493) exited]
[New Thread 0x7fffede4e700 (LWP 5494)]
[New Thread 0x7fffee64f700 (LWP 5495)]
[New Thread 0x7fffdffff700 (LWP 5496)]
[New Thread 0x7fffdf7fe700 (LWP 5497)]
[Thread 0x7fffdf7fe700 (LWP 5497) exited]
[New Thread 0x7fffdf7fe700 (LWP 5498)]
[New Thread 0x7fffddbc0700 (LWP 5499)]
[Thread 0x7fffdf7fe700 (LWP 5498) exited]
[New Thread 0x7fffdd3bf700 (LWP 5500)]
[New Thread 0x7fffdcbbe700 (LWP 5501)]
[New Thread 0x7fffcffff700 (LWP 5502)]
[New Thread 0x7fffcf5ed700 (LWP 5503)]
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 0x7fffcebd8700 (LWP 5504)]
[New Thread 0x7fffcddc5700 (LWP 5505)]
[New Thread 0x7fffcd19b700 (LWP 5506)]
settingsChanged "PulseAudio"
[New Thread 0x7fffb1b26700 (LWP 5507)]
[New Thread 0x7fffad324700 (LWP 5508)]
LxQt::RotatedWidget(0x84c930)  does not have a property named  "iconSize"
LxQt::RotatedWidget(0x84c930)  does not have a property named  "iconSize"
DesktopSwitchWidget(0x6f1400, name = "DesktopSwitch")  does not have a property named  "iconSize"
LxQtQuickLaunch(0x759fd0, name = "QuickLaunch")  does not have a property named  "iconSize"
QLabel(0x750250, name = "QuickLaunchPlaceHolder")  does not have a property named  "iconSize"
LxQtTaskBar(0x766b60, name = "TaskBar")  does not have a property named  "iconSize"
QWidget(0x867090, 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"
** 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"
XdgCachedMenu(0x90d880, name = "TopLevelMainMenu")  does not have a property named  "iconSize"

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6cf375d in QAbstractButton::setChecked(bool) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
(gdb) bt
#0  0x00007ffff6cf375d in QAbstractButton::setChecked(bool) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#1  0x00007fffdc1b8b3c in DesktopSwitch::x11EventFilter (this=0x6f13b0, _event=<optimized out>)
    at /tmp/buildd/lxqt-panel-0.7.0.siduction.15/plugin-desktopswitch/desktopswitch.cpp:129
#2  0x0000000000411490 in LxQtPanel::x11EventFilter (this=0x6d2a60, event=event@entry=0x7fffffffe1f0)
    at /tmp/buildd/lxqt-panel-0.7.0.siduction.15/panel/lxqtpanel.cpp:732
#3  0x0000000000414afb in LxQtPanelApplication::x11EventFilter (this=<optimized out>, event=0x7fffffffe1f0)
    at /tmp/buildd/lxqt-panel-0.7.0.siduction.15/panel/lxqtpanelapplication.cpp:108
#4  0x00007ffff69a58d1 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#5  0x00007ffff69b3aca in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#6  0x00007ffff69dc212 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#7  0x00007ffff4898e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007ffff4899048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007ffff48990ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007ffff75d5f8d in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#11 0x00007ffff69dc2c6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#12 0x00007ffff75a7481 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#13 0x00007ffff75a7795 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#14 0x00007ffff75acef7 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#15 0x000000000040f1fc in main (argc=1, argv=0x7fffffffe7e8) at /tmp/buildd/lxqt-panel-0.7.0.siduction.15/panel/main.cpp:113
(gdb)