I had this issue when I had qbittorent running for many days.  top shows 
hud-service eating 99% cpu.
Closing qbittorrent fixed the issue.  


The ~/.cache/upstart/hud.log 

QDBusError("org.freedesktop.DBus.Error.InvalidArgs", "Unable to find windowId") 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "The 
name :1.289 was not provided by any .service files" 
QCoreApplication::postEvent: Unexpected null receiver
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "The 
name :1.304 was not provided by any .service files" 
QCoreApplication::postEvent: Unexpected null receiver
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
QCoreApplication::postEvent: Unexpected null receiver
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
QCoreApplication::postEvent: Unexpected null receiver
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
QCoreApplication::postEvent: Unexpected null receiver
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
QCoreApplication::postEvent: Unexpected null receiver
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
QCoreApplication::postEvent: Unexpected null receiver
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
QCoreApplication::postEvent: Unexpected null receiver
void 
DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher*): "No such 
object path '/MenuBar/1'" 
QCoreApplication::postEvent: Unexpected null receiver

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https://bugs.launchpad.net/bugs/1300722

Title:
  hud-service is eating up 100% of one of my CPUs in a poll loop

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