Application: kwin_x11 (5.3.1)

Qt Version: 5.4.1
Operating System: Linux 4.0.4-gentoo x86_64
Distribution: "Gentoo Base System release 2.2"

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

I pressed Alt+Tab repeatedly to cycle windows. This had not the expected effect of making KWin show me a different window, but crashed it instead.

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Aborted
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7febdc98f800 (LWP 24766))]

Thread 3 (Thread 0x7febd57aa700 (LWP 24770)):
#0  0x000000319a4e3af3 in select () from /lib64/libc.so.6
#1  0x0000003babeebbd9 in qt_safe_select (nfds=17, fdread=fdread@entry=0x7febcc000a78, fdwrite=fdwrite@entry=0x7febcc000d08, fdexcept=fdexcept@entry=0x7febcc000f98, orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2  0x0000003babeed826 in select (timeout=0x0, exceptfds=0x7febcc000f98, writefds=0x7febcc000d08, readfds=0x7febcc000a78, nfds=<optimized out>, this=0x7febcc0008c0) at kernel/qeventdispatcher_unix.cpp:320
#3  QEventDispatcherUNIXPrivate::doSelect (this=this@entry=0x7febcc0008e0, flags=..., flags@entry=..., timeout=timeout@entry=0x0) at kernel/qeventdispatcher_unix.cpp:196
#4  0x0000003babeedda5 in QEventDispatcherUNIX::processEvents (this=0x7febcc0008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5  0x0000003babe95b02 in QEventLoop::exec (this=this@entry=0x7febd57a9da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x0000003babca021e in QThread::exec (this=this@entry=0x18f8d10) at thread/qthread.cpp:503
#7  0x0000003bb32cf765 in QQmlThreadPrivate::run (this=0x18f8d10) at qml/ftw/qqmlthread.cpp:141
#8  0x0000003babca5182 in QThreadPrivate::start (arg=0x18f8d10) at thread/qthread_unix.cpp:337
#9  0x000000319ac072f6 in start_thread () from /lib64/libpthread.so.0
#10 0x000000319a4eabdd in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7febd8ff8700 (LWP 24771)):
#0  0x000000319ac0c84f in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x0000003baed7a5c4 in ?? () from /usr/lib64/libQt5Script.so.5
#2  0x0000003baed7a609 in ?? () from /usr/lib64/libQt5Script.so.5
#3  0x000000319ac072f6 in start_thread () from /lib64/libpthread.so.0
#4  0x000000319a4eabdd in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7febdc98f800 (LWP 24766)):
[KCrash Handler]
#5  0x000000319a433a27 in raise () from /lib64/libc.so.6
#6  0x000000319a434d39 in abort () from /lib64/libc.so.6
#7  0x0000003babc91f3e in qt_message_fatal (context=..., message=...) at global/qlogging.cpp:1415
#8  QMessageLogger::fatal (this=this@entry=0x7ffd0859e7e0, msg=msg@entry=0x7febdc4829d5 "Could not initialize OpenGL") at global/qlogging.cpp:636
#9  0x00007febdc43377a in QXcbWindow::create (this=0x160a770) at qxcbwindow.cpp:378
#10 0x00007febdc41fee4 in QXcbIntegration::createPlatformWindow (this=<optimized out>, window=0x185b8f0) at qxcbintegration.cpp:194
#11 0x0000003ba94eb2a6 in QWindowPrivate::create (this=0x1815b50, recursive=recursive@entry=false) at kernel/qwindow.cpp:395
#12 0x0000003ba94eb47b in QWindow::create (this=this@entry=0x185b8f0) at kernel/qwindow.cpp:539
#13 0x0000003ba94eb628 in QWindow::winId (this=0x185b8f0) at kernel/qwindow.cpp:558
#14 0x00007febdb250486 in PlasmaQuick::Dialog::event(QEvent*) () from /usr/lib64/libKF5PlasmaQuick.so.5
#15 0x0000003ba9b5bb0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#16 0x0000003ba9b60f88 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#17 0x0000003babe9829b in QCoreApplication::notifyInternal (this=0x7ffd085a0010, receiver=receiver@entry=0x185b8f0, event=event@entry=0x7ffd0859ece0) at kernel/qcoreapplication.cpp:935
#18 0x0000003ba94ee1ed in sendEvent (event=0x7ffd0859ece0, receiver=0x185b8f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#19 QWindow::setIcon (this=0x185b8f0, icon=...) at kernel/qwindow.cpp:850
#20 0x00007febdb24c8c3 in PlasmaQuick::Dialog::Dialog(QQuickItem*) () from /usr/lib64/libKF5PlasmaQuick.so.5
#21 0x00007febdb492140 in ?? () from /usr/lib64/qt5/qml/org/kde/plasma/core/libcorebindingsplugin.so
#22 0x0000003bb3263feb in QQmlType::create (this=this@entry=0x7febcc049cb0) at qml/qqmlmetatype.cpp:713
#23 0x0000003bb32ccf33 in QQmlObjectCreator::createInstance (this=this@entry=0x17d8790, index=2, parent=0x173d710, isContextObject=isContextObject@entry=false) at qml/qqmlobjectcreator.cpp:1061
#24 0x0000003bb32ca3ad in QQmlObjectCreator::setPropertyBinding (this=this@entry=0x17d8790, property=property@entry=0x7febcc163f18, binding=binding@entry=0x7febcc08dd18) at qml/qqmlobjectcreator.cpp:774
#25 0x0000003bb32cb22e in QQmlObjectCreator::setupBindings (this=this@entry=0x17d8790, bindingsToSkip=...) at qml/qqmlobjectcreator.cpp:733
#26 0x0000003bb32cbbad in QQmlObjectCreator::populateInstance (this=this@entry=0x17d8790, index=0, instance=0x0, instance@entry=0x173d710, bindingTarget=0x3babf6e960 <QArrayData::shared_null>, bindingTarget@entry=0x173d710, valueTypeProperty=valueTypeProperty@entry=0x0, bindingsToSkip=...) at qml/qqmlobjectcreator.cpp:1348
#27 0x0000003bb32cc933 in QQmlObjectCreator::createInstance (this=this@entry=0x17d8790, index=index@entry=0, parent=parent@entry=0x0, isContextObject=isContextObject@entry=true) at qml/qqmlobjectcreator.cpp:1184
#28 0x0000003bb32cd67c in QQmlObjectCreator::create (this=0x17d8790, subComponentIndex=-1, parent=parent@entry=0x0, interrupt=interrupt@entry=0x0) at qml/qqmlobjectcreator.cpp:222
#29 0x0000003bb324ed87 in QQmlComponentPrivate::beginCreate (this=0x17e53f0, context=0x17ed960) at qml/qqmlcomponent.cpp:880
#30 0x0000003bb324f1fd in beginCreate (publicContext=0x17dde70, this=0x183a130) at qml/qqmlcomponent.cpp:829
#31 QQmlComponent::create (this=0x183a130, context=0x17dde70) at qml/qqmlcomponent.cpp:789
#32 0x0000003bb759e752 in ?? () from /usr/lib64/libkwin.so.5
#33 0x0000003bb759fb8c in ?? () from /usr/lib64/libkwin.so.5
#34 0x0000003bb759fe31 in ?? () from /usr/lib64/libkwin.so.5
#35 0x0000003bb75c48b5 in ?? () from /usr/lib64/libkwin.so.5
#36 0x0000003babec8145 in QMetaObject::activate (sender=sender@entry=0x17287c8, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=32765, argv=0x0, argv@entry=0x7ffd085a0010) at kernel/qobject.cpp:3716
#37 0x0000003babec88df in QMetaObject::activate (sender=sender@entry=0x17287c8, m=m@entry=0x3bac0c9b80 <QTimer::staticMetaObject>, local_signal_index=32765, local_signal_index@entry=0, argv=0x7ffd085a0010, argv@entry=0x0) at kernel/qobject.cpp:3582
#38 0x0000003babf47f40 in QTimer::timeout (this=this@entry=0x17287c8) at .moc/moc_qtimer.cpp:192
#39 0x0000003babed631a in QTimer::timerEvent (this=0x17287c8, e=<optimized out>) at kernel/qtimer.cpp:247
#40 0x0000003babec9387 in QObject::event (this=0x17287c8, e=<optimized out>) at kernel/qobject.cpp:1267
#41 0x0000003ba9b5bb0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#42 0x0000003ba9b60f88 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#43 0x0000003babe9829b in QCoreApplication::notifyInternal (this=0x7ffd085a0010, receiver=0x17287c8, event=event@entry=0x7ffd0859fdc0) at kernel/qcoreapplication.cpp:935
#44 0x0000003babeef54d in sendEvent (event=0x7ffd0859fdc0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#45 QTimerInfoList::activateTimers (this=0x1663c78) at kernel/qtimerinfo_unix.cpp:635
#46 0x0000003babeed4a0 in QEventDispatcherUNIX::activateTimers (this=this@entry=0x166ad80) at kernel/qeventdispatcher_unix.cpp:549
#47 0x0000003babeedd73 in QEventDispatcherUNIX::processEvents (this=0x166ad80, flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:611
#48 0x00007febdc475215 in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:62
#49 0x0000003babe95b02 in QEventLoop::exec (this=this@entry=0x7ffd0859ff30, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#50 0x0000003babe9d714 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#51 0x0000003bb7e053bd in kdemain () from /usr/lib64/libkdeinit5_kwin_x11.so
#52 0x000000319a420050 in __libc_start_main () from /lib64/libc.so.6
#53 0x000000000040083e in _start ()

Reported using DrKonqi