export KWIN_USE_INTEL_SWAP_EVENT=0
export KWIN_EXPLICIT_SYNC=0
export KWIN_USE_BUFFER_AGE=0
export LIBGL_DRI3_DISABLE=1
kwin_x11 --replace &

In case that works, please figure ("unset FOO_BAR") which variable does it.
Can you obtain supportInformation while the compositor is up? (try "sleep 30; 
qdbus org.kde.kwin /KWin org.kde.KWin.supportInformation", then press 
SHIFT+Alt+F12 to toggle the compositor and just wait a minute or so before 
toggling it off again)

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https://bugs.launchpad.net/bugs/1440210

Title:
  KWin crashes multiple times a day and often has to be restarted
  manually.

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