Public bug reported:

I updated 2 computers to Plasma 5.12 on Kubuntu 17.10: after reboot they
showed high cpu usage and high memory usage until system crash after 15
minutes or so(I guess because of running out of memory).

On another computer I updated my KDE neon developer git-stable: no
problem on that one with its Plasma 5.13beta.

After googling around I found the solution: 
https://bugs.kde.org/show_bug.cgi?id=368838 : plasmashell memory leak when 
slideshow is used for wallpaper/media frame/photo widget
https://bugs.kde.org/show_bug.cgi?id=381000 : [Regression] High CPU when 
background is set to slideshow : this one has been upstreamed to Qt: 
https://bugreports.qt.io/browse/QTBUG-62117 : endSync never called from 
renderloop - leads to extreme memory use

The product on kde is called "plasmashell". I don't know to what kubuntu
package that belongs.

I'm using desktop slideshow on all 3 computers (rotating pictures every
10 seconds). No idea yet why on the KDE neon the bug doesn't show up as
it hasn't been fixed yet.

So after changing desktop background from slideshow to single image and
removing my two widgets from the desktop, my Kubuntu 17.10 computers are
usable again.

** Affects: plasma-desktop (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1749601

Title:
  Kubuntu 17.10: Plasma 5.12: system crash after high cpu and memory
  usage

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