Application: kwin (4.9.95)
KDE Platform Version: 4.9.95
Qt Version: 4.8.3
Operating System: Linux 3.5.0-21-generic i686
Distribution: Ubuntu 12.10

-- Information about the crash:
I got a crash as I changed the desktop effects in systemsettings to off, on, off.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0xaff80980 (LWP 3352))]

Thread 3 (Thread 0xaceffb40 (LWP 3356)):
#0  0xb77bf424 in __kernel_vsyscall ()
#1  0xb2c2496b in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:169
#2  0xb758b64c in __pthread_cond_wait (cond=0xb67bd670, mutex=0xb67bd658) at forward.c:139
#3  0xb66ab1cd in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#4  0xb66ab1ff in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#5  0xb647b0d1 in ?? () from /usr/lib/nvidia-current-updates/libGL.so.1
#6  0x5c8b0824 in ?? ()
#7  0xbab80424 in ?? ()
#8  0x65000000 in ?? ()
#9  0x001015ff in ?? ()
#10 0xd3890000 in ?? ()
#11 0xfff0013d in ?? ()
#12 0xc30173ff in ?? ()
#13 0x0fc3d2e8 in ?? ()
#14 0xbbc18100 in ?? ()
#15 0x8b001774 in ?? ()
#16 0xfffefc89 in ?? ()
#17 0x29d231ff in ?? ()
#18 0x0d0365c2 in ?? ()
#19 0x00000000 in ?? ()

Thread 2 (Thread 0xaa6efb40 (LWP 3362)):
#0  0xb2c54dcd in __GI_clock_gettime (clock_id=1, tp=0xaa6eef08) at ../sysdeps/unix/clock_gettime.c:116
#1  0xb5e88fb5 in do_gettime (frac=0xaa6eef00, sec=0xaa6eeef8) at tools/qelapsedtimer_unix.cpp:123
#2  qt_gettime () at tools/qelapsedtimer_unix.cpp:140
#3  0xb5f7036e in QTimerInfoList::updateCurrentTime (this=0xa9d00b54) at kernel/qeventdispatcher_unix.cpp:343
#4  0xaa6ef0ec in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Thread 1 (Thread 0xaff80980 (LWP 3352)):
[KCrash Handler]
#7  0xb6afb6ce in QDeclarativeItem::~QDeclarativeItem (this=0x97c2c60, __in_chrg=<optimized out>) at graphicsitems/qdeclarativeitem.cpp:1668
#8  0xb6aba124 in ~QDeclarativeElement (this=0x97c2c60, __in_chrg=<optimized out>) at ../../include/QtDeclarative/../../src/declarative/qml/qdeclarativeprivate.h:87
#9  QDeclarativePrivate::QDeclarativeElement<QDeclarativeItem>::~QDeclarativeElement (this=0x97c2c60, __in_chrg=<optimized out>) at ../../include/QtDeclarative/../../src/declarative/qml/qdeclarativeprivate.h:87
#10 0xb5f51783 in qDeleteInEventHandler (o=o@entry=0x97c2c60) at kernel/qobject.cpp:4277
#11 0xb5f53f10 in QObject::event (this=0x97c2c60, e=0x92cd928) at kernel/qobject.cpp:1176
#12 0xb6af5ad4 in QDeclarativeItem::event (this=0x97c2c60, ev=0x92cd928) at graphicsitems/qdeclarativeitem.cpp:3748
#13 0xb542e39c in QApplicationPrivate::notify_helper (this=0x9035fd8, receiver=0x97c2c60, e=0x92cd928) at kernel/qapplication.cpp:4562
#14 0xb5432daf in QApplication::notify (this=0x92cd928, receiver=0x97c2c60, e=0x92cd928) at kernel/qapplication.cpp:3944
#15 0xb72392b1 in KApplication::notify (this=0xbfe431e8, receiver=0x97c2c60, event=0x92cd928) at ../../kdeui/kernel/kapplication.cpp:311
#16 0xb76bd9ff in notify (e=0x92cd928, o=0x97c2c60, this=0xbfe431e8) at ../../kwin/main.cpp:371
#17 KWin::Application::notify (this=0xbfe431e8, o=0x97c2c60, e=0x92cd928) at ../../kwin/main.cpp:367
#18 0xb5f3d78e in QCoreApplication::notifyInternal (this=0xbfe431e8, receiver=0x97c2c60, event=0x92cd928) at kernel/qcoreapplication.cpp:915
#19 0xb5f4197d in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#20 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8f8c130) at kernel/qcoreapplication.cpp:1539
#21 0xb5f41c0c in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1432
#22 0xb54e582d in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#23 QEventDispatcherX11::processEvents (this=0x8f8cea0, flags=...) at kernel/qeventdispatcher_x11.cpp:75
#24 0xb5f3c26c in QEventLoop::processEvents (this=this@entry=0xbfe43068, flags=...) at kernel/qeventloop.cpp:149
#25 0xb5f3c561 in QEventLoop::exec (this=0xbfe43068, flags=...) at kernel/qeventloop.cpp:204
#26 0xb5f41cba in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#27 0xb542bfc4 in QApplication::exec () at kernel/qapplication.cpp:3823
#28 0xb76c0481 in kdemain (argc=3, argv=0xbfe432d4) at ../../kwin/main.cpp:537
#29 0x0804855b in main (argc=3, argv=0xbfe432d4) at kwin_dummy.cpp:3

Possible duplicates by query: bug 311110, bug 311018, bug 304617.

Reported using DrKonqi