Application: kwin (4.10.1)
KDE Platform Version: 4.10.1
Qt Version: 4.8.4
Operating System: Linux 3.8.4-202.fc18.x86_64 x86_64
Distribution (Platform): Fedora RPMs

-- Information about the crash:
- What I was doing when the application crashed:
I logged to kde enviroment and after that i saw the black screen about 2 second and kde desktop loaded with crash reporting window.

-- Backtrace:
Application: KWin (kwin), signal: Aborted
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fa71cb3b880 (LWP 2159))]

Thread 2 (Thread 0x7fa71144d700 (LWP 2161)):
#0  0x00007fa71bfa4bf9 in syscall () from /lib64/libc.so.6
#1  0x0000003a5ac7a404 in QMutexPrivate::wait(int) () from /lib64/libQtCore.so.4
#2  0x0000003a5ac76615 in QMutex::lockInternal() () from /lib64/libQtCore.so.4
#3  0x0000003a5d85ba86 in QDBusPendingCallPrivate::waitForFinished() () from /lib64/libQtDBus.so.4
#4  0x0000003a5d85c292 in QDBusPendingCallWatcher::waitForFinished() () from /lib64/libQtDBus.so.4
#5  0x000000351c4091a6 in KActivities::Consumer::currentActivity() const () from /lib64/libkactivities.so.6
#6  0x0000003522640b11 in KWin::fetchActivityListAndCurrent(KActivities::Controller*) () from /lib64/libkdeinit4_kwin.so
#7  0x000000352264be03 in QtConcurrent::StoredFunctorCall1<QPair<QString, QStringList>, QPair<QString, QStringList> (*)(KActivities::Controller*), KActivities::Controller*>::runFunctor() () from /lib64/libkdeinit4_kwin.so
#8  0x0000003522650156 in QtConcurrent::RunFunctionTask<QPair<QString, QStringList> >::run() () from /lib64/libkdeinit4_kwin.so
#9  0x0000003a5ac6f5ad in QThreadPoolThread::run() () from /lib64/libQtCore.so.4
#10 0x0000003a5ac7b95c in QThreadPrivate::start(void*) () from /lib64/libQtCore.so.4
#11 0x00007fa71c77ad15 in start_thread (arg=0x7fa71144d700) at pthread_create.c:308
#12 0x00007fa71bfa848d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fa71cb3b880 (LWP 2159)):
[KCrash Handler]
#5  0x00007fa71beebba5 in raise () from /lib64/libc.so.6
#6  0x00007fa71beed358 in abort () from /lib64/libc.so.6
#7  0x00007fa71bf2b59b in __libc_message () from /lib64/libc.so.6
#8  0x00007fa71bf31776 in malloc_printerr () from /lib64/libc.so.6
#9  0x00007fa71bf34107 in _int_malloc () from /lib64/libc.so.6
#10 0x00007fa71bf35443 in malloc () from /lib64/libc.so.6
#11 0x0000003a5ac7d7f5 in QByteArray::QByteArray(char const*, int) () from /lib64/libQtCore.so.4
#12 0x00000035184bff1a in KConfigIniBackend::parseConfig(QByteArray const&, KEntryMap&, QFlags<KConfigBackend::ParseOption>, bool) () from /lib64/libkdecore.so.5
#13 0x00000035184c0069 in KConfigIniBackend::writeConfig(QByteArray const&, KEntryMap&, QFlags<KConfigBackend::WriteOption>, KComponentData const&) () from /lib64/libkdecore.so.5
#14 0x00000035184ab7e6 in KConfig::sync() () from /lib64/libkdecore.so.5
#15 0x00000035226b1456 in KWin::Compositor::slotCompositingOptionsInitialized() () from /lib64/libkdeinit4_kwin.so
#16 0x0000003a5ad8ceef in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#17 0x0000003a5ac6c5d7 in QFutureWatcherBase::event(QEvent*) () from /lib64/libQtCore.so.4
#18 0x0000003a5b3ca5cc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#19 0x0000003a5b3cea4a in QApplication::notify(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#20 0x00000035190473c6 in KApplication::notify(QObject*, QEvent*) () from /lib64/libkdeui.so.5
#21 0x0000003a5ad77abe in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib64/libQtCore.so.4
#22 0x0000003a5ad7b571 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQtCore.so.4
#23 0x0000003a5b46b3bc in QEventDispatcherX11::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtGui.so.4
#24 0x0000003a5ad7680f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#25 0x0000003a5ad76a98 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#26 0x0000003a5ad7b888 in QCoreApplication::exec() () from /lib64/libQtCore.so.4
#27 0x0000003522667d6a in kdemain () from /lib64/libkdeinit4_kwin.so
#28 0x00007fa71bed7a05 in __libc_start_main () from /lib64/libc.so.6
#29 0x0000000000400991 in _start ()

Reported using DrKonqi