(In reply to Alexander Graf from comment #1) > Something definitely went very wrong here. The to-be-aged page had a page > size of 3.5k. > > Was this while shutting down a guest or in normal operation? It was during "normal" installation of a guest. During installation. I was able to reproduce it today with a 512MB of RAM guest. Yesterday it was with a 384MB guest. I don't know exactly how to reproduce it. I had to try installation 3 times before getting the kernel warning.