[Bug 1457692] [NEW] KWin frequent crashes after upgrade to Plasma 5.3

[Torsten Römer]

Public bug reported:

After upgrading kubuntu 15.04 to Plasma 5.3 from the backports PPA, KWin crashes in rapid succession and I get a dialog (translated from German) "KWin is unstable. It seems it crashed multiple times in a row. You can choose another window manager:"
The dropdown however only offers "kwin_x11".

Please see the attached backtrace, hope it is useful.

Most of the time, the startup screen hangs forever at about 80%.
Switching to a console and "killall startkde" and trying to log in again
sometimes goes further, and then the KWin crashes occur.

** Affects: kubuntu-ppa
     Importance: Undecided
         Status: New

** Attachment added: "KWinCrash.txt"
   https://bugs.launchpad.net/bugs/1457692/+attachment/4402111/+files/KWinCrash.txt

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Title:
  KWin frequent crashes after upgrade to Plasma 5.3

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