Comment 4 for bug 1321204

Since the re-exec makes the memory drop down, this sounds like an issue similar to bug 1235649 - a rogue client is connecting to upstart but without using a main loop, or not registering the required NIH main loop callbacks to allow libdbus linked into Upstart to flush the messages it is attempting to send to the client.

See: https://bugs.launchpad.net/ubuntu/+source/upstart/+bug/1235649/comments/48

If so, fwics this is not a bug with Upstart, but a limitation of D-Bus not allowing the D-Bus server to determine if the client is "badly behaved" and just discard any D-Bus replies the server is expected to send to the client. The only correct behaviour for D-Bus if it cannot know if the client is badly behaved is to keep caching more and more reply messages until the client attempts to receive these reply messages.