I think I've got a working workaround :

- apt install appmenu-qt5
- in your ~/.profile, add 'export QT_QPA_PLATFORMTHEME=appmenu-qt5'
- reload your session

No more memory leak for me, but I've only applied that a couple of hours
ago, so I'm not 100% sure yet.

If this is confirmed, it means the culprit is the new native Qt5 dbus
appmenu/indicator support in yakkety, while in xenial and before an
external plugin called 'appmenu-qt5' was used for the integration of Qt5
menus in Unity.

More information about this change here :
https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1612767

Unfortunately it seems this old plugin is going the way of the dodo in
zesty : https://bugs.launchpad.net/ubuntu/+source/appmenu-
qt5/+bug/1634941

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https://bugs.launchpad.net/bugs/1635577

Title:
  memory leak in unity-panel-service

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