Application: kwin (4.10.97)
KDE Platform Version: 4.10.97
Qt Version: 4.8.4
Operating System: Linux 3.8.0-19-generic x86_64
Distribution: Ubuntu 13.04

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

Removing "screens" from the "Filter windows by" in the Task Switcher KCM.

-- 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 0x7ffb5352d7c0 (LWP 18817))]

Thread 3 (Thread 0x7ffb2ffff700 (LWP 19480)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ffb51ee9e77 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007ffb51ee9ea9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007ffb4a8a9f8e in start_thread (arg=0x7ffb2ffff700) at pthread_create.c:311
#4  0x00007ffb52cf3e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7ffb34e89700 (LWP 20635)):
#0  0x00007ffb52cec233 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ffb4d0fd4f3 in qt_safe_select (nfds=13, fdread=0x7ffb28000ac8, fdwrite=0x7ffb28000d60, fdexcept=0x7ffb28000ff8, orig_timeout=0x0) at kernel/qcore_unix.cpp:83
#2  0x00007ffb4d102499 in QEventDispatcherUNIXPrivate::doSelect (this=this@entry=0x7ffb28000910, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:223
#3  0x00007ffb4d102c82 in QEventDispatcherUNIX::processEvents (this=0x7ffb280008f0, flags=...) at kernel/qeventdispatcher_unix.cpp:937
#4  0x00007ffb4d0d038f in QEventLoop::processEvents (this=this@entry=0x7ffb34e88d90, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007ffb4d0d0618 in QEventLoop::exec (this=this@entry=0x7ffb34e88d90, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007ffb4cfd2410 in QThread::exec (this=this@entry=0xda1460) at thread/qthread.cpp:542
#7  0x00007ffb4d0b1edf in QInotifyFileSystemWatcherEngine::run (this=0xda1460) at io/qfilesystemwatcher_inotify.cpp:256
#8  0x00007ffb4cfd4bec in QThreadPrivate::start (arg=0xda1460) at thread/qthread_unix.cpp:338
#9  0x00007ffb4a8a9f8e in start_thread (arg=0x7ffb34e89700) at pthread_create.c:311
#10 0x00007ffb52cf3e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7ffb5352d7c0 (LWP 18817)):
[KCrash Handler]
#6  0x0000000100000011 in ?? ()
#7  0x00007ffb529ec626 in KDecorationPlugins::destroyPreviousPlugin (this=this@entry=0xa110b0) at ../../../kwin/libkdecorations/kdecoration_plugins_p.cpp:277
#8  0x00007ffb5301ae75 in KWin::Workspace::slotReconfigure (this=0xa25800) at ../../kwin/workspace.cpp:814
#9  0x00007ffb4d0e60ef in QMetaObject::activate (sender=0xa25930, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3539
#10 0x00007ffb4d0eb3ec in QObject::event (this=0xa25930, e=<optimized out>) at kernel/qobject.cpp:1156
#11 0x00007ffb4c4778ec in QApplicationPrivate::notify_helper (this=this@entry=0x896ee0, receiver=receiver@entry=0xa25930, e=e@entry=0x7fff527f1900) at kernel/qapplication.cpp:4567
#12 0x00007ffb4c47a25b in QApplication::notify (this=this@entry=0x7fff527f1f40, receiver=receiver@entry=0xa25930, e=e@entry=0x7fff527f1900) at kernel/qapplication.cpp:4428
#13 0x00007ffb5194c916 in KApplication::notify (this=0x7fff527f1f40, receiver=0xa25930, event=0x7fff527f1900) at ../../kdeui/kernel/kapplication.cpp:311
#14 0x00007ffb4d0d163e in QCoreApplication::notifyInternal (this=0x7fff527f1f40, receiver=0xa25930, event=event@entry=0x7fff527f1900) at kernel/qcoreapplication.cpp:946
#15 0x00007ffb4d102b72 in sendEvent (event=0x7fff527f1900, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#16 QTimerInfoList::activateTimers (this=0x897bc8) at kernel/qeventdispatcher_unix.cpp:622
#17 0x00007ffb4d102bd0 in QEventDispatcherUNIX::activateTimers (this=this@entry=0x8965b0) at kernel/qeventdispatcher_unix.cpp:879
#18 0x00007ffb4d102d28 in QEventDispatcherUNIX::processEvents (this=this@entry=0x8965b0, flags=...) at kernel/qeventdispatcher_unix.cpp:941
#19 0x00007ffb4c51db9f in QEventDispatcherX11::processEvents (this=0x8965b0, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#20 0x00007ffb4d0d038f in QEventLoop::processEvents (this=this@entry=0x7fff527f1c50, flags=...) at kernel/qeventloop.cpp:149
#21 0x00007ffb4d0d0618 in QEventLoop::exec (this=this@entry=0x7fff527f1c50, flags=...) at kernel/qeventloop.cpp:204
#22 0x00007ffb4d0d5cf6 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#23 0x00007ffb4c475ffc in QApplication::exec () at kernel/qapplication.cpp:3828
#24 0x00007ffb5303d7e3 in kdemain (argc=1, argv=0x7fff527f2088) at ../../kwin/main.cpp:589
#25 0x00007ffb52c1bea5 in __libc_start_main (main=0x4006d0 <main(int, char**)>, argc=1, ubp_av=0x7fff527f2088, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff527f2078) at libc-start.c:260
#26 0x0000000000400701 in _start ()

Reported using DrKonqi