Application: kwin_x11 (5.3.1)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-18-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
- What I was doing when the application crashed:
Opened the lid on the laptop. It woke up from hibernation. I Alt+Tab, to look for a running program. It didn' respond, and KWin crashed.

The crash can be reproduced sometimes.

-- 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 0x7f1c37b9d800 (LWP 2135))]

Thread 5 (Thread 0x7f1c14051700 (LWP 2149)):
#0  0x00007f1c376758dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1c2e6fcebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1c2e6fd242 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1c1a8f0ae6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f1c2e723955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f1c36ef26aa in start_thread (arg=0x7f1c14051700) at pthread_create.c:333
#6  0x00007f1c37680eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f1c13850700 (LWP 2154)):
#0  0x00007f1c376758dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1c2e6fcebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1c2e6fcfcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1c2e6fd009 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1c2e723955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f1c36ef26aa in start_thread (arg=0x7f1c13850700) at pthread_create.c:333
#6  0x00007f1c37680eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f1c11557700 (LWP 2164)):
#0  0x00007f1c37677743 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1c35c65101 in qt_safe_select (nfds=22, fdread=fdread@entry=0x7f1c00000a78, fdwrite=fdwrite@entry=0x7f1c00000d08, fdexcept=fdexcept@entry=0x7f1c00000f98, orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2  0x00007f1c35c66cd2 in select (timeout=0x0, exceptfds=0x7f1c00000f98, writefds=0x7f1c00000d08, readfds=0x7f1c00000a78, nfds=<optimized out>, this=0x7f1c000008c0) at kernel/qeventdispatcher_unix.cpp:320
#3  QEventDispatcherUNIXPrivate::doSelect (this=this@entry=0x7f1c000008e0, flags=..., flags@entry=..., timeout=timeout@entry=0x0) at kernel/qeventdispatcher_unix.cpp:196
#4  0x00007f1c35c67275 in QEventDispatcherUNIX::processEvents (this=0x7f1c000008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5  0x00007f1c35c0e3e2 in QEventLoop::exec (this=this@entry=0x7f1c11556da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f1c359cdb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f1c2f830f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f1c359d2b0e in QThreadPrivate::start (arg=0xd42660) at thread/qthread_unix.cpp:337
#9  0x00007f1c36ef26aa in start_thread (arg=0x7f1c11557700) at pthread_create.c:333
#10 0x00007f1c37680eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f1bf8e6b700 (LWP 2177)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f1c347d6644 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f1c347d6689 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f1c36ef26aa in start_thread (arg=0x7f1bf8e6b700) at pthread_create.c:333
#4  0x00007f1c37680eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f1c37b9d800 (LWP 2135)):
[KCrash Handler]
#6  QScreen::handle (this=0x0) at kernel/qscreen.cpp:85
#7  0x00007f1c21a10545 in QXcbWindow::QXcbWindow (this=0x1c15760, window=0x1a532e0) at qxcbwindow.cpp:260
#8  0x00007f1c219fd5c1 in QXcbIntegration::createPlatformWindow (this=<optimized out>, window=0x1a532e0) at qxcbintegration.cpp:194
#9  0x00007f1c35f62786 in QWindowPrivate::create (this=0xa0b6b0, recursive=recursive@entry=false) at kernel/qwindow.cpp:395
#10 0x00007f1c35f6297b in QWindow::create (this=this@entry=0x1a532e0) at kernel/qwindow.cpp:539
#11 0x00007f1c35f62b28 in QWindow::winId (this=0x1a532e0) at kernel/qwindow.cpp:558
#12 0x00007f1b6958fb50 in PlasmaQuick::DialogPrivate::updateInputShape (this=0x1fb1570) at ../../../src/plasmaquick/dialog.cpp:542
#13 0x00007f1c35c419c9 in QMetaObject::activate (sender=sender@entry=0x1a532e0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=12, argv=argv@entry=0x7ffebc0e6fd0) at kernel/qobject.cpp:3716
#14 0x00007f1c35c42057 in QMetaObject::activate (sender=sender@entry=0x1a532e0, m=m@entry=0x7f1c363a9b80 <QWindow::staticMetaObject>, local_signal_index=local_signal_index@entry=12, argv=argv@entry=0x7ffebc0e6fd0) at kernel/qobject.cpp:3582
#15 0x00007f1c35f621c2 in QWindow::visibleChanged (this=this@entry=0x1a532e0, _t1=_t1@entry=true) at .moc/moc_qwindow.cpp:710
#16 0x00007f1c35f654b7 in QWindow::setVisible (this=this@entry=0x1a532e0, visible=visible@entry=true) at kernel/qwindow.cpp:471
#17 0x00007f1b6958fa00 in PlasmaQuick::Dialog::setVisible (this=this@entry=0x1a532e0, visible=<optimized out>) at ../../../src/plasmaquick/dialog.cpp:1225
#18 0x00007f1b6959405a in PlasmaQuick::Dialog::qt_metacall (this=0x1a532e0, _c=QMetaObject::WriteProperty, _id=9, _a=0x7ffebc0e7140) at ./moc_dialog.cpp:376
#19 0x00007f1c2f7a8b7f in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#20 0x00007f1c2f7aa5fb in QQmlPropertyPrivate::writeValueProperty(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#21 0x00007f1c2f7aad31 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 0x00007f1c2f81f51c in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#23 0x00007f1c2f81fc7e in QQmlBinding::expressionChanged(QQmlJavaScriptExpression*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#24 0x00007f1c2f7f9497 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#25 0x00007f1c2f79610c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#26 0x00007f1c35c41141 in QMetaObject::activate (sender=0x1d69cc0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3603
#27 0x00007f1c35c42057 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7f1c37574220 <KWin::TabBox::SwitcherItem::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3582
#28 0x00007f1c372d46a0 in KWin::TabBox::SwitcherItem::visibleChanged (this=<optimized out>) at moc_switcheritem.cpp:244
#29 0x00007f1c372ae16f in KWin::TabBox::SwitcherItem::setVisible (this=<optimized out>, visible=visible@entry=true) at ../tabbox/switcheritem.cpp:75
#30 0x00007f1c372b1e61 in KWin::TabBox::TabBoxHandlerPrivate::show (this=<optimized out>) at ../tabbox/tabboxhandler.cpp:340
#31 0x00007f1c372b2039 in KWin::TabBox::TabBoxHandler::show (this=0xc334d0) at ../tabbox/tabboxhandler.cpp:378
#32 0x00007f1c372a3076 in KWin::TabBox::TabBox::show (this=<optimized out>) at ../tabbox/tabbox.cpp:736
#33 0x00007f1c372d6295 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 0x00007f1c35c419c9 in QMetaObject::activate (sender=sender@entry=0xc3c008, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3716
#35 0x00007f1c35c42057 in QMetaObject::activate (sender=sender@entry=0xc3c008, m=m@entry=0x7f1c35e6b580 <QTimer::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3582
#36 0x00007f1c35cc1610 in QTimer::timeout (this=this@entry=0xc3c008) at .moc/moc_qtimer.cpp:192
#37 0x00007f1c35c4f918 in QTimer::timerEvent (this=0xc3c008, e=<optimized out>) at kernel/qtimer.cpp:247
#38 0x00007f1c35c426f3 in QObject::event (this=0xc3c008, e=<optimized out>) at kernel/qobject.cpp:1267
#39 0x00007f1c3651ab2c in QApplicationPrivate::notify_helper (this=0x9f7450, receiver=0xc3c008, e=0x7ffebc0e7b50) at kernel/qapplication.cpp:3720
#40 0x00007f1c36520000 in QApplication::notify (this=0x7ffebc0e7d90, receiver=0xc3c008, e=0x7ffebc0e7b50) at kernel/qapplication.cpp:3503
#41 0x00007f1c35c10c2b in QCoreApplication::notifyInternal (this=0x7ffebc0e7d90, receiver=0xc3c008, event=event@entry=0x7ffebc0e7b50) at kernel/qcoreapplication.cpp:935
#42 0x00007f1c35c68ae5 in sendEvent (event=0x7ffebc0e7b50, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#43 QTimerInfoList::activateTimers (this=0xa96108) at kernel/qtimerinfo_unix.cpp:635
#44 0x00007f1c35c666a0 in QEventDispatcherUNIX::activateTimers (this=this@entry=0xa94300) at kernel/qeventdispatcher_unix.cpp:549
#45 0x00007f1c35c67243 in QEventDispatcherUNIX::processEvents (this=0xa94300, flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:611
#46 0x00007f1c21a5296d in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:62
#47 0x00007f1c35c0e3e2 in QEventLoop::exec (this=this@entry=0x7ffebc0e7cb0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#48 0x00007f1c35c1602c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#49 0x00007f1c35f5531c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#50 0x00007f1c365167a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#51 0x00007f1c37949320 in kdemain (argc=1, argv=0x7ffebc0e7ef8) at ../main_x11.cpp:300
#52 0x00007f1c3759aa40 in __libc_start_main (main=0x4007a0 <main(int, char**)>, argc=1, argv=0x7ffebc0e7ef8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffebc0e7ee8) at libc-start.c:289
#53 0x00000000004007d9 in _start ()

Reported using DrKonqi