Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib/libthread_db.so.1".
[KCrash Handler]
#7  0xaef4f175 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#8  0xbfc10778 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)