Application: kwin (4.10.00)
KDE Platform Version: 4.10.00
Qt Version: 4.8.3
Operating System: Linux 3.5.0-23-generic i686
Distribution: Ubuntu 12.10

-- Information about the crash:
Changing and Saving any Widget Style causes Kwin crash and restart.  I was able to repeat it multiple times. 

Running KDE 4.10 on Kubuntu 12.10, Kernel 3.5.0-23-generic.

-- 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 0xb1c64980 (LWP 5469))]

Thread 3 (Thread 0xaecffb40 (LWP 5472)):
#0  0xb772b424 in __kernel_vsyscall ()
#1  0xb2c1b96b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0xb750564c in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0xb66241cd in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#4  0xb66241ff in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#5  0xb2c17d4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#6  0xb74f7d3e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 2 (Thread 0xadc51b40 (LWP 5475)):
#0  0xb2c4bdcd in clock_gettime () from /lib/i386-linux-gnu/librt.so.1
#1  0xb5e7ffb5 in do_gettime (frac=0xadc50fb0, sec=0xadc50fa8) at tools/qelapsedtimer_unix.cpp:123
#2  qt_gettime () at tools/qelapsedtimer_unix.cpp:140
#3  0xb5f6736e in QTimerInfoList::updateCurrentTime (this=0xad300b34) at kernel/qeventdispatcher_unix.cpp:343
#4  0xadc5119c in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Thread 1 (Thread 0xb1c64980 (LWP 5469)):
[KCrash Handler]
#7  0xb6a756ce in QDeclarativeItem::~QDeclarativeItem (this=0x985e820, __in_chrg=<optimized out>) at graphicsitems/qdeclarativeitem.cpp:1668
#8  0xb6a34124 in ~QDeclarativeElement (this=0x985e820, __in_chrg=<optimized out>) at ../../include/QtDeclarative/../../src/declarative/qml/qdeclarativeprivate.h:87
#9  QDeclarativePrivate::QDeclarativeElement<QDeclarativeItem>::~QDeclarativeElement (this=0x985e820, __in_chrg=<optimized out>) at ../../include/QtDeclarative/../../src/declarative/qml/qdeclarativeprivate.h:87
#10 0xb5f48783 in qDeleteInEventHandler (o=o@entry=0x985e820) at kernel/qobject.cpp:4277
#11 0xb5f4af10 in QObject::event (this=0x985e820, e=0x929a808) at kernel/qobject.cpp:1176
#12 0xb6a6fad4 in QDeclarativeItem::event (this=0x985e820, ev=0x929a808) at graphicsitems/qdeclarativeitem.cpp:3748
#13 0xb542539c in QApplicationPrivate::notify_helper (this=0x889d638, receiver=0x985e820, e=0x929a808) at kernel/qapplication.cpp:4562
#14 0xb5429daf in QApplication::notify (this=0x929a808, receiver=0x985e820, e=0x929a808) at kernel/qapplication.cpp:3944
#15 0xb71b3321 in KApplication::notify (this=0xbfd96da8, receiver=0x985e820, event=0x929a808) at ../../kdeui/kernel/kapplication.cpp:311
#16 0xb7628aef in notify (e=0x929a808, o=0x985e820, this=0xbfd96da8) at ../../kwin/main.cpp:371
#17 KWin::Application::notify (this=0xbfd96da8, o=0x985e820, e=0x929a808) at ../../kwin/main.cpp:367
#18 0xb5f3478e in QCoreApplication::notifyInternal (this=0xbfd96da8, receiver=0x985e820, event=0x929a808) at kernel/qcoreapplication.cpp:915
#19 0xb5f3897d 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=0x8850130) at kernel/qcoreapplication.cpp:1539
#21 0xb5f38c0c in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1432
#22 0xb54dc82d in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#23 QEventDispatcherX11::processEvents (this=0x8850eb8, flags=...) at kernel/qeventdispatcher_x11.cpp:75
#24 0xb5f3326c in QEventLoop::processEvents (this=this@entry=0xbfd96c28, flags=...) at kernel/qeventloop.cpp:149
#25 0xb5f33561 in QEventLoop::exec (this=0xbfd96c28, flags=...) at kernel/qeventloop.cpp:204
#26 0xb5f38cba in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#27 0xb5422fc4 in QApplication::exec () at kernel/qapplication.cpp:3823
#28 0xb762b571 in kdemain (argc=3, argv=0xbfd96e94) at ../../kwin/main.cpp:537
#29 0x0804855b in main (argc=3, argv=0xbfd96e94) at kwin_dummy.cpp:3

Possible duplicates by query: bug 314716, bug 314606, bug 314508, bug 314445, bug 313132.

Reported using DrKonqi