If I go to the digital clock settings > Calendar, and tick on the PIM Events Plugin box, first, plasma freezes for a while (e.g., while I write this), then it crashes. When restarting it, if I try to display the calendar by clicking on the digital clock widget, it eats up all 16 Gb of memory in about 20 seconds, then crashes again.

I suspect this is not how it is supposed to work.

The PIM events in question are from three ownCloud calendars, which work fine on Kontact and elsewhere.

Note: I see bug #293354 but in my case it's plasmashell eating up all the memory, not korgac.