Application: kwin (4.10.3)
KDE Platform Version: 4.10.3 (Compiled from sources)
Qt Version: 4.8.4
Operating System: Linux 3.9.5 i686
Distribution: "Gentoo Base System release 2.2"

-- Information about the crash:
- What I was doing when the application crashed:
as the topic sais, I rebooted a stable Gentoo Linux and logged in.
FWIW the login process was very looong due to a parallel "emerge sync" - whci stressed the system.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0xb24e1740 (LWP 5989))]

Thread 2 (Thread 0xb164eb40 (LWP 6001)):
[KCrash Handler]
#7  0xb61fb495 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x3, event_type=43, data=0xb164eb40) at kernel/qcoreapplication.cpp:1474
#8  0xb61fbb6c in QCoreApplication::sendPostedEvents (receiver=0x8d5a170, event_type=43) at kernel/qcoreapplication.cpp:1463
#9  0xb63c0c7f in QDBusPendingCallWatcher::waitForFinished (this=0x8d5a170) at qdbuspendingcall.cpp:535
#10 0xb675678a in KActivities::Consumer::currentActivity() const () from /usr/lib/libkactivities.so.6
#11 0xb75bdf05 in KWin::fetchActivityListAndCurrent (controller=0x8d570b8) at /var/tmp/portage/kde-base/kwin-4.10.3/work/kwin-4.10.3/kwin/workspace.cpp:1406
#12 0xb75c8baf in QtConcurrent::StoredFunctorCall1<QPair<QString, QStringList>, QPair<QString, QStringList> (*)(KActivities::Controller*), KActivities::Controller*>::runFunctor (this=0x8cac088) at /usr/include/qt4/QtCore/qtconcurrentstoredfunctioncall.h:267
#13 0xb75caaee in run (this=0x8cac088) at /usr/include/qt4/QtCore/qtconcurrentrunbase.h:106
#14 QtConcurrent::RunFunctionTask<QPair<QString, QStringList> >::run (this=0x8cac088) at /usr/include/qt4/QtCore/qtconcurrentrunbase.h:97
#15 0xb60d29da in QThreadPoolThread::run (this=0x8d6f1b0) at concurrent/qthreadpool.cpp:107
#16 0xb60e02f8 in QThreadPrivate::start (arg=0x8d6f1b0) at thread/qthread_unix.cpp:338
#17 0x46b2bdef in start_thread (arg=0xb164eb40) at pthread_create.c:305
#18 0x46a6b41e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:133

Thread 1 (Thread 0xb24e1740 (LWP 5989)):
#0  0xb7710424 in __kernel_vsyscall ()
#1  0x46b2fb8c in pthread_cond_wait () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:169
#2  0x46a7874c in __pthread_cond_wait (cond=0x8d6a980, mutex=0x8d6a968) at forward.c:139
#3  0xb60e08e0 in wait (time=4294967295, this=0x8d6a968) at thread/qwaitcondition_unix.cpp:86
#4  QWaitCondition::wait (this=0x8d6a8c8, mutex=0x8d6a8b4, time=4294967295) at thread/qwaitcondition_unix.cpp:158
#5  0xb60d2199 in QThreadPoolPrivate::waitForDone (this=0x8d6a868, msecs=-1) at concurrent/qthreadpool.cpp:298
#6  0xb60d3c18 in QThreadPool::~QThreadPool (this=0x8d6a858, __in_chrg=<optimized out>) at concurrent/qthreadpool.cpp:440
#7  0xb60d3c72 in QThreadPool::~QThreadPool (this=0x8d6a858, __in_chrg=<optimized out>) at concurrent/qthreadpool.cpp:442
#8  0xb60d3ca8 in QGlobalStaticDeleter<QThreadPool>::~QGlobalStaticDeleter (this=0xb635daa0 <theInstance()::cleanup>, __in_chrg=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qglobal.h:1948
#9  0x469b0581 in __run_exit_handlers (status=1, listp=0x46b1e3e4 <__exit_funcs>, run_list_atexit=true) at exit.c:78
#10 0x469b060d in __GI_exit (status=1) at exit.c:100
#11 0xb57855d8 in qt_xio_errhandler () at kernel/qapplication_x11.cpp:772
#12 0xb7328429 in KApplication::xioErrhandler (this=0xbfe6cf14, dpy=0x8cb9668) at /var/tmp/portage/kde-base/kdelibs-4.10.3-r2/work/kdelibs-4.10.3/kdeui/kernel/kapplication.cpp:419
#13 0xb7328464 in kde_xio_errhandler (dpy=0x8cb9668) at /var/tmp/portage/kde-base/kdelibs-4.10.3-r2/work/kdelibs-4.10.3/kdeui/kernel/kapplication.cpp:126
#14 0x47857577 in _XIOError () from /usr/lib/libX11.so.6
#15 0x47854178 in ?? () from /usr/lib/libX11.so.6
#16 0x47854d52 in _XFlush () from /usr/lib/libX11.so.6
#17 0x47857c4b in _XGetRequest () from /usr/lib/libX11.so.6
#18 0x47ab6690 in ?? () from /usr/lib/libXrandr.so.2
#19 0x47ab6e67 in XRRGetScreenInfo () from /usr/lib/libXrandr.so.2
#20 0xb75ed69c in KWin::currentRefreshRate () at /var/tmp/portage/kde-base/kwin-4.10.3/work/kwin-4.10.3/kwin/options.cpp:103
#21 0xb7640645 in KWin::Compositor::slotCompositingOptionsInitialized (this=0x8d7ac48) at /var/tmp/portage/kde-base/kwin-4.10.3/work/kwin-4.10.3/kwin/composite.cpp:242
#22 0xb75b2198 in qt_static_metacall (_a=0xbfe6c730, _id=14, _o=0x8d7ac48, _c=<optimized out>) at /var/tmp/portage/kde-base/kwin-4.10.3/work/kwin-4.10.3_build/kwin/moc_composite.cpp:113
#23 KWin::Compositor::qt_static_metacall (_o=0x8d7ac48, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0xbfe6c730) at /var/tmp/portage/kde-base/kwin-4.10.3/work/kwin-4.10.3_build/kwin/moc_composite.cpp:93
#24 0xb620e6d1 in QMetaObject::activate (sender=0x8da4fa8, m=0xb635b800 <QFutureWatcherBase::staticMetaObject>, local_signal_index=1, argv=0x0) at kernel/qobject.cpp:3539
#25 0xb625e045 in QFutureWatcherBase::finished (this=0x8da4fa8) at .moc/release-shared/moc_qfuturewatcher.cpp:141
#26 0xb60cefbc in QFutureWatcherBasePrivate::sendCallOutEvent (this=0x8dafd98, event=0xb0300468) at concurrent/qfuturewatcher.cpp:439
#27 0xb60cf2c2 in QFutureWatcherBase::event (this=0x8da4fa8, event=0xb0300468) at concurrent/qfuturewatcher.cpp:344
#28 0xb570de54 in notify_helper (e=0xb0300468, receiver=0x8da4fa8, this=0x8caa5c8) at kernel/qapplication.cpp:4562
#29 QApplicationPrivate::notify_helper (this=0x8caa5c8, receiver=0x8da4fa8, e=0xb0300468) at kernel/qapplication.cpp:4534
#30 0xb571322a in QApplication::notify (this=0xb0300468, receiver=0x8da4fa8, e=0xb0300468) at kernel/qapplication.cpp:4291
#31 0xb732a361 in KApplication::notify (this=0xbfe6cf14, receiver=0x8da4fa8, event=0xb0300468) at /var/tmp/portage/kde-base/kdelibs-4.10.3-r2/work/kdelibs-4.10.3/kdeui/kernel/kapplication.cpp:311
#32 0xb75e3cff in notify (e=0xb0300468, o=0x8da4fa8, this=0xbfe6cf14) at /var/tmp/portage/kde-base/kwin-4.10.3/work/kwin-4.10.3/kwin/main.cpp:371
#33 KWin::Application::notify (this=0xbfe6cf14, o=0x8da4fa8, e=0xb0300468) at /var/tmp/portage/kde-base/kwin-4.10.3/work/kwin-4.10.3/kwin/main.cpp:367
#34 0xb61f7b3e in QCoreApplication::notifyInternal (this=0xbfe6cf14, receiver=0x8da4fa8, event=0xb0300468) at kernel/qcoreapplication.cpp:946
#35 0xb61fb814 in sendEvent (event=0xb0300468, receiver=0x8da4fa8) at kernel/qcoreapplication.h:231
#36 QCoreApplicationPrivate::sendPostedEvents (receiver=<error reading variable: Cannot access memory at address 0x80>, event_type=0, data=<error reading variable: Cannot access memory at address 0x88>) at kernel/qcoreapplication.cpp:1570
#37 0xb61fbb6c in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1463
#38 0xb57c256a in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#39 QEventDispatcherX11::processEvents (this=0x8c73ef0, flags=...) at kernel/qeventdispatcher_x11.cpp:75
#40 0xb61f63cd in QEventLoop::processEvents (this=0xbfe6ce74, flags=...) at kernel/qeventloop.cpp:149
#41 0xb61f6669 in QEventLoop::exec (this=0xbfe6ce74, flags=...) at kernel/qeventloop.cpp:204
#42 0xb61fbc1a in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#43 0xb570bde4 in QApplication::exec () at kernel/qapplication.cpp:3823
#44 0xb75e6bba in kdemain (argc=3, argv=0xbfe6d1b4) at /var/tmp/portage/kde-base/kwin-4.10.3/work/kwin-4.10.3/kwin/main.cpp:537
#45 0x080485fb in main (argc=3, argv=0xbfe6d1b4) at /var/tmp/portage/kde-base/kwin-4.10.3/work/kwin-4.10.3_build/kwin/kwin_dummy.cpp:3

Reported using DrKonqi