Application: kwin (4.8.2 (4.8.2))
KDE Platform Version: 4.8.2 (4.8.2)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-23-generic x86_64
Distribution: Ubuntu 12.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:

I clicked on the application launcher icon in the lower left

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f96384707c0 (LWP 1667))]

Thread 3 (Thread 0x7f961912c700 (LWP 1672)):
#0  0x00007f9637c75823 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007f96333bf366 in qt_safe_select (nfds=28, fdread=0x7f9610000ae8, fdwrite=0x7f9610000d80, fdexcept=0x7f9610001018, orig_timeout=<optimized out>) at kernel/qcore_unix.cpp:83
#2  0x00007f96333c47b2 in QEventDispatcherUNIXPrivate::doSelect (this=0x7f9610000930, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:223
#3  0x00007f96333c4ca3 in QEventDispatcherUNIX::processEvents (this=0x7f9610000910, flags=...) at kernel/qeventdispatcher_unix.cpp:926
#4  0x00007f9633391c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f9633391ed7 in QEventLoop::exec (this=0x7f961912bcd0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f9633290fa7 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007f96333719ff in QInotifyFileSystemWatcherEngine::run (this=0x1a6dcc0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f9633293fcb in QThreadPrivate::start (arg=0x1a6dcc0) at thread/qthread_unix.cpp:298
#9  0x00007f9633ee0b74 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007f962c4bee9a in start_thread (arg=0x7f961912c700) at pthread_create.c:308
#11 0x00007f9637c7c4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f961892b700 (LWP 1673)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9634735222 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f9634735259 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f9633ee0b74 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#4  0x00007f962c4bee9a in start_thread (arg=0x7f961892b700) at pthread_create.c:308
#5  0x00007f9637c7c4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f96384707c0 (LWP 1667)):
[KCrash Handler]
#6  0x00007f9619e31845 in KWin::CoverSwitchEffect::postPaintScreen (this=0x1a03200) at ../../../kwin/effects/coverswitch/coverswitch.cpp:411
#7  0x00007f9638019098 in KWin::EffectsHandlerImpl::postPaintScreen (this=0x1967a90) at ../../kwin/effects.cpp:228
#8  0x00007f9638019098 in KWin::EffectsHandlerImpl::postPaintScreen (this=0x1967a90) at ../../kwin/effects.cpp:228
#9  0x00007f9637ff8880 in KWin::Scene::paintScreen (this=0x175bef0, mask=0x7fff966bb1d8, region=0x7fff966bb2a0) at ../../kwin/scene.cpp:159
#10 0x00007f963800e68d in KWin::SceneOpenGL::paint (this=0x175bef0, damage=..., toplevels=...) at ../../kwin/scene_opengl_glx.cpp:459
#11 0x00007f9637ff22fc in KWin::Workspace::performCompositing (this=0x14d9e30) at ../../kwin/composite.cpp:412
#12 0x00007f96333ac179 in QObject::event (this=0x14d9e30, e=<optimized out>) at kernel/qobject.cpp:1157
#13 0x00007f9632715894 in notify_helper (e=0x7fff966bb9a0, receiver=0x14d9e30, this=0x1387420) at kernel/qapplication.cpp:4559
#14 QApplicationPrivate::notify_helper (this=0x1387420, receiver=0x14d9e30, e=0x7fff966bb9a0) at kernel/qapplication.cpp:4531
#15 0x00007f963271a713 in QApplication::notify (this=0x7fff966bbdc0, receiver=0x14d9e30, e=0x7fff966bb9a0) at kernel/qapplication.cpp:4420
#16 0x00007f9637757b46 in KApplication::notify (this=0x7fff966bbdc0, receiver=0x14d9e30, event=0x7fff966bb9a0) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007f9633392e9c in QCoreApplication::notifyInternal (this=0x7fff966bbdc0, receiver=0x14d9e30, event=0x7fff966bb9a0) at kernel/qcoreapplication.cpp:876
#18 0x00007f96333c41f2 in sendEvent (event=0x7fff966bb9a0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#19 QTimerInfoList::activateTimers (this=0x1387fd8) at kernel/qeventdispatcher_unix.cpp:611
#20 0x00007f96333c4cb4 in QEventDispatcherUNIX::processEvents (this=0x12eead0, flags=...) at kernel/qeventdispatcher_unix.cpp:930
#21 0x00007f96327bebf8 in QEventDispatcherX11::processEvents (this=0x12eead0, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#22 0x00007f9633391c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#23 0x00007f9633391ed7 in QEventLoop::exec (this=0x7fff966bbd00, flags=...) at kernel/qeventloop.cpp:204
#24 0x00007f9633396f67 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#25 0x00007f9637fa7a06 in kdemain (argc=<optimized out>, argv=<optimized out>) at ../../kwin/main.cpp:541
#26 0x00007f9637bab76d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=3, ubp_av=0x7fff966bc4e8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff966bc4d8) at libc-start.c:226
#27 0x0000000000400671 in _start ()

Possible duplicates by query: bug 300325, bug 298644, bug 292614.

Reported using DrKonqi