Application: kwin_x11 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-25-generic x86_64
Distribution: Ubuntu 15.04

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

I have my laptop (Lenovo T430) in a docking station with monitor attached at work. I suspended it before leaving and then resumed it at home. The greet process crashed first and then kwin crashed when I tried to use the task switcher (alt-tab).

I already disabled compositing, since otherwise I never had a task bar/switcher after resume.

Everything worked better on kubuntu 14.04, I only had these issues with 15.04 (though I have occassionally seen kwin crash on 14.04 too).

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f4769896800 (LWP 3650))]

Thread 3 (Thread 0x7f4746122700 (LWP 3657)):
#0  0x00007f4769371743 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f4767bbb101 in qt_safe_select (nfds=18, fdread=fdread@entry=0x7f4738000a78, fdwrite=fdwrite@entry=0x7f4738000d08, fdexcept=fdexcept@entry=0x7f4738000f98, orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2  0x00007f4767bbccd2 in select (timeout=0x0, exceptfds=0x7f4738000f98, writefds=0x7f4738000d08, readfds=0x7f4738000a78, nfds=<optimized out>, this=0x7f47380008c0) at kernel/qeventdispatcher_unix.cpp:320
#3  QEventDispatcherUNIXPrivate::doSelect (this=this@entry=0x7f47380008e0, flags=..., flags@entry=..., timeout=timeout@entry=0x0) at kernel/qeventdispatcher_unix.cpp:196
#4  0x00007f4767bbd275 in QEventDispatcherUNIX::processEvents (this=0x7f47380008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5  0x00007f4767b643e2 in QEventLoop::exec (this=this@entry=0x7f4746121da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f4767923b44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f47617d6f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f4767928b0e in QThreadPrivate::start (arg=0x16c4bd0) at thread/qthread_unix.cpp:337
#9  0x00007f47609a36aa in start_thread (arg=0x7f4746122700) at pthread_create.c:333
#10 0x00007f476937aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f47450a9700 (LWP 3658)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f476672d644 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f476672d689 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f47609a36aa in start_thread (arg=0x7f47450a9700) at pthread_create.c:333
#4  0x00007f476937aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f4769896800 (LWP 3650)):
[KCrash Handler]
#6  QScreen::handle (this=0x0) at kernel/qscreen.cpp:85
#7  0x00007f4754752545 in QXcbWindow::QXcbWindow (this=0x25405f0, window=0x18323a0) at qxcbwindow.cpp:260
#8  0x00007f475473f5c1 in QXcbIntegration::createPlatformWindow (this=<optimized out>, window=0x18323a0) at qxcbintegration.cpp:194
#9  0x00007f4767eb8786 in QWindowPrivate::create (this=0x1833990, recursive=recursive@entry=false) at kernel/qwindow.cpp:395
#10 0x00007f4767eb897b in QWindow::create (this=this@entry=0x18323a0) at kernel/qwindow.cpp:539
#11 0x00007f4767eb8b28 in QWindow::winId (this=0x18323a0) at kernel/qwindow.cpp:558
#12 0x00007f473fdd4b50 in PlasmaQuick::DialogPrivate::updateInputShape (this=0x1c94d00) at ../../../src/plasmaquick/dialog.cpp:542
#13 0x00007f4767b979c9 in QMetaObject::activate (sender=sender@entry=0x18323a0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=12, argv=argv@entry=0x7ffd8cdcf9f0) at kernel/qobject.cpp:3716
#14 0x00007f4767b98057 in QMetaObject::activate (sender=sender@entry=0x18323a0, m=m@entry=0x7f47682ffb80 <QWindow::staticMetaObject>, local_signal_index=local_signal_index@entry=12, argv=argv@entry=0x7ffd8cdcf9f0) at kernel/qobject.cpp:3582
#15 0x00007f4767eb81c2 in QWindow::visibleChanged (this=this@entry=0x18323a0, _t1=_t1@entry=true) at .moc/moc_qwindow.cpp:710
#16 0x00007f4767ebb4b7 in QWindow::setVisible (this=this@entry=0x18323a0, visible=visible@entry=true) at kernel/qwindow.cpp:471
#17 0x00007f473fdd4a00 in PlasmaQuick::Dialog::setVisible (this=this@entry=0x18323a0, visible=<optimized out>) at ../../../src/plasmaquick/dialog.cpp:1225
#18 0x00007f473fdd905a in PlasmaQuick::Dialog::qt_metacall (this=0x18323a0, _c=QMetaObject::WriteProperty, _id=9, _a=0x7ffd8cdcfb60) at ./moc_dialog.cpp:376
#19 0x00007f476174eb7f in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#20 0x00007f47617505fb in QQmlPropertyPrivate::writeValueProperty(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#21 0x00007f4761750d31 in QQmlPropertyPrivate::writeBinding(QObject*, QQmlPropertyData const&, QQmlContextData*, QQmlJavaScriptExpression*, QV4::ValueRef, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#22 0x00007f47617c551c in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#23 0x00007f47617c5c7e in QQmlBinding::expressionChanged(QQmlJavaScriptExpression*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#24 0x00007f476179f497 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#25 0x00007f476173c10c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#26 0x00007f4767b97141 in QMetaObject::activate (sender=0x17d8d50, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3603
#27 0x00007f4767b98057 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7f47692683e0 <KWin::TabBox::SwitcherItem::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3582
#28 0x00007f4768fd9750 in KWin::TabBox::SwitcherItem::visibleChanged (this=<optimized out>) at moc_switcheritem.cpp:244
#29 0x00007f4768fbad6f in KWin::TabBox::SwitcherItem::setVisible (this=<optimized out>, visible=visible@entry=true) at ../tabbox/switcheritem.cpp:75
#30 0x00007f4768fbe501 in KWin::TabBox::TabBoxHandlerPrivate::show (this=<optimized out>) at ../tabbox/tabboxhandler.cpp:333
#31 0x00007f4768fbe6c9 in KWin::TabBox::TabBoxHandler::show (this=0x147c6e0) at ../tabbox/tabboxhandler.cpp:371
#32 0x00007f4768fb0b57 in KWin::TabBox::TabBox::show (this=<optimized out>) at ../tabbox/tabbox.cpp:725
#33 0x00007f4768fdb065 in KWin::TabBox::TabBox::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at moc_tabbox.cpp:174
#34 0x00007f4767b979c9 in QMetaObject::activate (sender=sender@entry=0x147c738, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3716
#35 0x00007f4767b98057 in QMetaObject::activate (sender=sender@entry=0x147c738, m=m@entry=0x7f4767dc1580 <QTimer::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3582
#36 0x00007f4767c17610 in QTimer::timeout (this=this@entry=0x147c738) at .moc/moc_qtimer.cpp:192
#37 0x00007f4767ba5918 in QTimer::timerEvent (this=0x147c738, e=<optimized out>) at kernel/qtimer.cpp:247
#38 0x00007f4767b986f3 in QObject::event (this=0x147c738, e=<optimized out>) at kernel/qobject.cpp:1267
#39 0x00007f4768470b2c in QApplicationPrivate::notify_helper (this=0x12338f0, receiver=0x147c738, e=0x7ffd8cdd0540) at kernel/qapplication.cpp:3720
#40 0x00007f4768476000 in QApplication::notify (this=0x7ffd8cdd0780, receiver=0x147c738, e=0x7ffd8cdd0540) at kernel/qapplication.cpp:3503
#41 0x00007f4767b66c2b in QCoreApplication::notifyInternal (this=0x7ffd8cdd0780, receiver=0x147c738, event=event@entry=0x7ffd8cdd0540) at kernel/qcoreapplication.cpp:935
#42 0x00007f4767bbeae5 in sendEvent (event=0x7ffd8cdd0540, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#43 QTimerInfoList::activateTimers (this=0x12cb838) at kernel/qtimerinfo_unix.cpp:635
#44 0x00007f4767bbc6a0 in QEventDispatcherUNIX::activateTimers (this=this@entry=0x12ca440) at kernel/qeventdispatcher_unix.cpp:549
#45 0x00007f4767bbd243 in QEventDispatcherUNIX::processEvents (this=0x12ca440, flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:611
#46 0x00007f475479496d in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:62
#47 0x00007f4767b643e2 in QEventLoop::exec (this=this@entry=0x7ffd8cdd06a0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#48 0x00007f4767b6c02c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#49 0x00007f4767eab31c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#50 0x00007f476846c7a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#51 0x00007f47696428c3 in kdemain (argc=3, argv=0x7ffd8cdd08d8) at ../main_x11.cpp:294
#52 0x00007f4769294a40 in __libc_start_main (main=0x400790 <main(int, char**)>, argc=3, argv=0x7ffd8cdd08d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd8cdd08c8) at libc-start.c:289
#53 0x00000000004007c9 in _start ()

Reported using DrKonqi