Application: kwin_x11 (5.8.6)
 (Compiled from sources)
Qt Version: 5.6.2
Frameworks Version: 5.32.0
Operating System: Linux 4.9.18-desktop-2.mga6 x86_64
Distribution: "Mageia 6"

-- Information about the crash:
- What I was doing when the application crashed: Install Kmail from Rpmdrake

- Unusual behavior I noticed: Flash desktop AN

The KDE desktop has made a small flash and has rebooted without apparent serious error, when I was installing from rpmdrake the kmail application

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f164859f840 (LWP 16236))]

Thread 6 (Thread 0x7f162dfa8700 (LWP 16461)):
#0  0x00007f165d446e43 in select () from /lib64/libc.so.6
#1  0x00007f165b2ff40f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () from /lib64/libQt5Core.so.5
#2  0x00007f165b300d2b in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () from /lib64/libQt5Core.so.5
#3  0x00007f165b3011f2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f165b2aef9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f165b0e83bc in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f16564e2915 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007f165b0ecff9 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007f165d71566d in start_thread () from /lib64/libpthread.so.0
#9  0x00007f165d450e4d in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7f1626779700 (LWP 16349)):
#0  0x00007f165d71ac4f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f165a48e234 in QTWTF::TCMalloc_PageHeap::scavengerThread() () from /lib64/libQt5Script.so.5
#2  0x00007f165a48e279 in QTWTF::TCMalloc_PageHeap::runScavengerThread(void*) () from /lib64/libQt5Script.so.5
#3  0x00007f165d71566d in start_thread () from /lib64/libpthread.so.0
#4  0x00007f165d450e4d in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f162f817700 (LWP 16339)):
#0  0x00007f165d446e43 in select () from /lib64/libc.so.6
#1  0x00007f165b2ff40f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) () from /lib64/libQt5Core.so.5
#2  0x00007f165b300d2b in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) () from /lib64/libQt5Core.so.5
#3  0x00007f165b3011f2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f165b2aef9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f165b0e83bc in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f16564e2915 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007f165b0ecff9 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007f165d71566d in start_thread () from /lib64/libpthread.so.0
#9  0x00007f165d450e4d in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f163e1b6700 (LWP 16271)):
#0  0x00007f165b0e5848 in QMutex::unlock() () from /lib64/libQt5Core.so.5
#1  0x00007f165b2b2d08 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQt5Core.so.5
#2  0x00007f165b3010e2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#3  0x00007f165b2aef9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f165b0e83bc in QThread::exec() () from /lib64/libQt5Core.so.5
#5  0x00007f165dc92615 in QDBusConnectionManager::run() () from /lib64/libQt5DBus.so.5
#6  0x00007f165b0ecff9 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#7  0x00007f165d71566d in start_thread () from /lib64/libpthread.so.0
#8  0x00007f165d450e4d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f163fcd0700 (LWP 16252)):
#0  0x00007f165d44500d in poll () from /lib64/libc.so.6
#1  0x00007f165c5b8902 in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007f165c5ba657 in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007f1640ce9ba9 in QXcbEventReader::run() () from /lib64/libQt5XcbQpa.so.5
#4  0x00007f165b0ecff9 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007f165d71566d in start_thread () from /lib64/libpthread.so.0
#6  0x00007f165d450e4d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f164859f840 (LWP 16236)):
[KCrash Handler]
#6  0x00007f165b2e1d6e in QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) () from /lib64/libQt5Core.so.5
#7  0x00007f165a4cf1c7 in QScriptEnginePrivate::qobjectData(QObject*) () from /lib64/libQt5Script.so.5
#8  0x00007f165a4cf28f in QScriptEnginePrivate::newQObject(QObject*, QScriptEngine::ValueOwnership, QFlags<QScriptEngine::QObjectWrapOption> const&) () from /lib64/libQt5Script.so.5
#9  0x00007f165a4cf522 in QScriptEngine::newQObject(QObject*, QScriptEngine::ValueOwnership, QFlags<QScriptEngine::QObjectWrapOption> const&) () from /lib64/libQt5Script.so.5
#10 0x00007f165d05103c in KWin::effectWindowToScriptValue(QScriptEngine*, KWin::EffectWindow* const&) () from /lib64/libkwin.so.5
#11 0x00007f165a4cf805 in QScriptEnginePrivate::create(QTJSC::ExecState*, int, void const*) () from /lib64/libQt5Script.so.5
#12 0x00007f165a4f69c3 in QScript::QObjectConnectionManager::execute(int, void**) () from /lib64/libQt5Script.so.5
#13 0x00007f165a4ff215 in QScript::QObjectConnectionManager::qt_metacall(QMetaObject::Call, int, void**) () from /lib64/libQt5Script.so.5
#14 0x00007f165b2dc0a7 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#15 0x00007f165aab4048 in KWin::EffectsHandler::desktopPresenceChanged(KWin::EffectWindow*, int, int) () from /lib64/libkwineffects.so.9
#16 0x00007f165aab5551 in KWin::EffectsHandler::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libkwineffects.so.9
#17 0x00007f165b2dceca in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
#18 0x00007f165bbc3c4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#19 0x00007f165bbc8db6 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#20 0x00007f165b2b1118 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#21 0x00007f165b2b2f3b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQt5Core.so.5
#22 0x00007f165b3010e2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#23 0x00007f1640d5a96d in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5XcbQpa.so.5
#24 0x00007f165b2aef9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#25 0x00007f165b2b7301 in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#26 0x00007f165d9340e6 in kdemain () from /lib64/libkdeinit5_kwin_x11.so
#27 0x00007f165d37b600 in __libc_start_main () from /lib64/libc.so.6
#28 0x00000000004007b9 in _start ()

Possible duplicates by query: bug 377225, bug 376696, bug 375332, bug 374704, bug 374119.

Reported using DrKonqi