My KWin is always crashing randomnly with the effects on.

I use ArchLinux, NVidia 8400M G with 260.19.21 driver and KDE 4.5.

This is the crash log:


Application: KWin (kwin), signal: Aborted
[KCrash Handler]
#7 0xb78a6424 in __kernel_vsyscall ()
#8 0xb7668de1 in raise () from /lib/libc.so.6
#9 0xb766a66e in abort () from /lib/libc.so.6
#10 0xb5cdaed5 in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/libstdc++.so.6
#11 0xb5cd8dd5 in ?? () from /usr/lib/libstdc++.so.6
#12 0xb5cd8e12 in std::terminate() () from /usr/lib/libstdc++.so.6
#13 0xb5cd8f81 in __cxa_throw () from /usr/lib/libstdc++.so.6
#14 0xb5cd9517 in operator new(unsigned int) () from /usr/lib/libstdc++.so.6
#15 0xb5cd95ed in operator new[](unsigned int) () from /usr/lib/libstdc++.so.6
#16 0xb6f6695c in KWin::GLShader::load(QString const&, QString const&) () from /usr/lib/libkwineffects.so.1
#17 0xb6f673d8 in KWin::GLShader::loadFromFiles(QString const&, QString const&) () from /usr/lib/libkwineffects.so.1
#18 0xb6f67960 in KWin::GLShader::GLShader(QString const&, QString const&) () from /usr/lib/libkwineffects.so.1
#19 0xb7851679 in ?? () from /usr/lib/libkdeinit4_kwin.so
#20 0xb7852708 in ?? () from /usr/lib/libkdeinit4_kwin.so
#21 0xb783e4c5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#22 0xb7857253 in ?? () from /usr/lib/libkdeinit4_kwin.so
#23 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#24 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#25 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#26 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#27 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#28 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#29 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#30 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#31 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#32 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#33 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#34 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#35 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#36 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#37 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#38 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#39 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#40 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#41 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#42 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#43 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#44 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#45 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#46 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#47 0xb6f56fbd in KWin::Effect::drawWindow(KWin::EffectWindow*, int, QRegion, KWin::WindowPaintData&) () from /usr/lib/libkwineffects.so.1
#48 0xb78572c9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#49 0xaead6569 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#50 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#51 0xaeaaafdb in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#52 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#53 0xaeaa3a98 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#54 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#55 0xaeaa7626 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#56 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#57 0xaead53e7 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#58 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#59 0xaea9bc66 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#60 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#61 0xaeacf382 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#62 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#63 0xaeae8ceb in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#64 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#65 0xaeab1a9c in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#66 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#67 0xaeab276e in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#68 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#69 0xaeaac92b in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#70 0xb7857439 in ?? () from /usr/lib/libkdeinit4_kwin.so
#71 0xb783e63b in ?? () from /usr/lib/libkdeinit4_kwin.so
#72 0xb783f840 in ?? () from /usr/lib/libkdeinit4_kwin.so
#73 0xb783db59 in ?? () from /usr/lib/libkdeinit4_kwin.so
#74 0xb785759c in ?? () from /usr/lib/libkdeinit4_kwin.so
#75 0xaeaae11f in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#76 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#77 0xaeab2f4f in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#78 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#79 0xb6f570b6 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () from /usr/lib/libkwineffects.so.1
#80 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#81 0xb6f570b6 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () from /usr/lib/libkwineffects.so.1
#82 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#83 0xb6f570b6 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () from /usr/lib/libkwineffects.so.1
#84 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#85 0xb6f570b6 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () from /usr/lib/libkwineffects.so.1
#86 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#87 0xb6f570b6 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () from /usr/lib/libkwineffects.so.1
#88 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#89 0xaea99616 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#90 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#91 0xaead08fa in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#92 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#93 0xaeae7f4c in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#94 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#95 0xb6f570b6 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () from /usr/lib/libkwineffects.so.1
#96 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#97 0xb6f570b6 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () from /usr/lib/libkwineffects.so.1
#98 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#99 0xb6f570b6 in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () from /usr/lib/libkwineffects.so.1
#100 0xb7857612 in ?? () from /usr/lib/libkdeinit4_kwin.so
#101 0xb783edb4 in ?? () from /usr/lib/libkdeinit4_kwin.so
#102 0xb78504d2 in ?? () from /usr/lib/libkdeinit4_kwin.so
#103 0xb783abc1 in ?? () from /usr/lib/libkdeinit4_kwin.so
#104 0xb77b0ffe in ?? () from /usr/lib/libkdeinit4_kwin.so
#105 0xb690dc4a in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
#106 0xb691da9f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#107 0xb696ac57 in QTimer::timeout() () from /usr/lib/libQtCore.so.4
#108 0xb69239de in QTimer::timerEvent(QTimerEvent*) () from /usr/lib/libQtCore.so.4
#109 0xb691c7a4 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#110 0xb5e43854 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#111 0xb5e4843e in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#112 0xb747da1a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#113 0xb77cc59f in ?? () from /usr/lib/libkdeinit4_kwin.so
#114 0xb69075cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#115 0xb6937741 in ?? () from /usr/lib/libQtCore.so.4
#116 0xb6937898 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#117 0xb5ef6236 in ?? () from /usr/lib/libQtGui.so.4
#118 0xb6906789 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#119 0xb6906a2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#120 0xb690b47f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#121 0xb5e416a7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#122 0xb77cedcb in kdemain () from /usr/lib/libkdeinit4_kwin.so
#123 0x0804853b in _start ()

The backtrace is missing debug infos, so I cannot provide dev infos to tell you what is causing the crash. Though it seems to be related to NVIDIA and shaders and I assume the Lanczos filter (could it be that it happens when hovering a tasks item or use present windows?)