Bug 353578

Summary: Plasma Crash When Monitor Power-cycled
Product: [Plasma] plasmashell Reporter: Garry Williams <gtwilliams>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED DUPLICATE    
Severity: crash CC: bhush94, e8hffff, kim.lindberger, notmart, plasma-bugs, reuben_p, tobias.klausmann
Priority: NOR Keywords: drkonqi
Version: 5.4.2   
Target Milestone: 1.0   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Garry Williams 2015-10-05 22:24:03 UTC 
Application: plasmashell (5.4.2)

Qt Version: 5.5.0
Operating System: Linux 4.2.2-300.fc23.x86_64 x86_64
Distribution: "Fedora release 23 (Twenty Three)"

-- Information about the crash:
- What I was doing when the application crashed:
Power-cycled the monitor at  start-up time for the desktop.  I did this because the display was not on.

-- Backtrace:
Application: Plasma (plasmashell), signal: Aborted
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fea4da09940 (LWP 1631))]

Thread 9 (Thread 0x7fea2d796700 (LWP 1667)):
#0  0x00007fea4548411d in poll () from /lib64/libc.so.6
#1  0x00007fea4b8c0182 in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007fea4b8c1c77 in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007fea2f71a999 in QXcbEventReader::run() () from /lib64/libQt5XcbQpa.so.5
#4  0x00007fea4608b54e in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007fea4413060a in start_thread () from /lib64/libpthread.so.0
#6  0x00007fea4548fbbd in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7fea26d43700 (LWP 1865)):
#0  0x00007fea40606764 in g_mutex_unlock () from /lib64/libglib-2.0.so.0
#1  0x00007fea405c1ba9 in g_main_context_check () from /lib64/libglib-2.0.so.0
#2  0x00007fea405c2110 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#3  0x00007fea405c227c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#4  0x00007fea462c2dab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fea46269daa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007fea460865a4 in QThread::exec() () from /lib64/libQt5Core.so.5
#7  0x00007fea4a355245 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#8  0x00007fea4608b54e in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007fea4413060a in start_thread () from /lib64/libpthread.so.0
#10 0x00007fea4548fbbd in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7fea1d00e700 (LWP 1879)):
#0  0x00007fea44135b10 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fea24962b9a in radeon_drm_cs_emit_ioctl () from /usr/lib64/dri/r600_dri.so
#2  0x00007fea249622d7 in impl_thrd_routine () from /usr/lib64/dri/r600_dri.so
#3  0x00007fea4413060a in start_thread () from /lib64/libpthread.so.0
#4  0x00007fea4548fbbd in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7fea18bcf700 (LWP 1887)):
#0  0x00007fea405bf1af in g_source_iter_next () from /lib64/libglib-2.0.so.0
#1  0x00007fea405c1ada in g_main_context_check () from /lib64/libglib-2.0.so.0
#2  0x00007fea405c2110 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#3  0x00007fea405c227c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#4  0x00007fea462c2dab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fea46269daa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007fea460865a4 in QThread::exec() () from /lib64/libQt5Core.so.5
#7  0x00007fea4a355245 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#8  0x00007fea4608b54e in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007fea4413060a in start_thread () from /lib64/libpthread.so.0
#10 0x00007fea4548fbbd in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7fea12fa4700 (LWP 1902)):
#0  0x00007fea40606764 in g_mutex_unlock () from /lib64/libglib-2.0.so.0
#1  0x00007fea405c2161 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fea405c227c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007fea462c2dab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007fea46269daa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fea460865a4 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007fea4a355245 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007fea4608b54e in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fea4413060a in start_thread () from /lib64/libpthread.so.0
#9  0x00007fea4548fbbd in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fea11633700 (LWP 1909)):
#0  0x00007fea44135b10 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fea4d190494 in QTWTF::TCMalloc_PageHeap::scavengerThread() () from /lib64/libQt5Script.so.5
#2  0x00007fea4d1904d9 in QTWTF::TCMalloc_PageHeap::runScavengerThread(void*) () from /lib64/libQt5Script.so.5
#3  0x00007fea4413060a in start_thread () from /lib64/libpthread.so.0
#4  0x00007fea4548fbbd in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fe98aa05700 (LWP 1916)):
#0  0x00007fea40606764 in g_mutex_unlock () from /lib64/libglib-2.0.so.0
#1  0x00007fea405c1b3a in g_main_context_check () from /lib64/libglib-2.0.so.0
#2  0x00007fea405c2110 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#3  0x00007fea405c227c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#4  0x00007fea462c2dab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fea46269daa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007fea460865a4 in QThread::exec() () from /lib64/libQt5Core.so.5
#7  0x00007fea4aef8616 in QQuickPixmapReader::run() () from /lib64/libQt5Quick.so.5
#8  0x00007fea4608b54e in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007fea4413060a in start_thread () from /lib64/libpthread.so.0
#10 0x00007fea4548fbbd in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fe979429700 (LWP 2064)):
#0  0x00007fea4548411d in poll () from /lib64/libc.so.6
#1  0x00007fea405c216c in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fea405c227c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007fea462c2dab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007fea46269daa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fea460865a4 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007fe97b05f3c7 in KCupsConnection::run() () from /lib64/libkcupslib.so
#7  0x00007fea4608b54e in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fea4413060a in start_thread () from /lib64/libpthread.so.0
#9  0x00007fea4548fbbd in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fea4da09940 (LWP 1631)):
[KCrash Handler]
#5  0x00007fea453c1a98 in raise () from /lib64/libc.so.6
#6  0x00007fea453c369a in abort () from /lib64/libc.so.6
#7  0x00007fea46079af1 in QMessageLogger::fatal(char const*, ...) const () from /lib64/libQt5Core.so.5
#8  0x00007fea467abe54 in QWindowPrivate::init() () from /lib64/libQt5Gui.so.5
#9  0x00007fea4af968dd in QQuickWindow::QQuickWindow(QWindow*) () from /lib64/libQt5Quick.so.5
#10 0x00007fea4d4c013c in PlasmaQuick::Dialog::Dialog(QQuickItem*) () from /lib64/libKF5PlasmaQuick.so.5
#11 0x00007fea256f8f10 in void QQmlPrivate::createInto<PlasmaQuick::Dialog>(void*) () from /usr/lib64/qt5/qml/org/kde/plasma/core/libcorebindingsplugin.so
#12 0x00007fea4a2ed9ab in QQmlType::create() const () from /lib64/libQt5Qml.so.5
#13 0x00007fea4a34eca4 in QQmlObjectCreator::createInstance(int, QObject*, bool) () from /lib64/libQt5Qml.so.5
#14 0x00007fea4a3510a3 in QQmlObjectCreator::setPropertyBinding(QQmlPropertyData const*, QV4::CompiledData::Binding const*) () from /lib64/libQt5Qml.so.5
#15 0x00007fea4a351386 in QQmlObjectCreator::setupBindings(QBitArray const&) () from /lib64/libQt5Qml.so.5
#16 0x00007fea4a34d8da in QQmlObjectCreator::populateInstance(int, QObject*, QObject*, QQmlPropertyData const*, QBitArray const&) () from /lib64/libQt5Qml.so.5
#17 0x00007fea4a34e23a in QQmlObjectCreator::createInstance(int, QObject*, bool) () from /lib64/libQt5Qml.so.5
#18 0x00007fea4a34f73f in QQmlObjectCreator::create(int, QObject*, QQmlInstantiationInterrupt*) () from /lib64/libQt5Qml.so.5
#19 0x00007fea4a2da217 in QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt&) () from /lib64/libQt5Qml.so.5
#20 0x00007fea4a2dab04 in QQmlIncubationController::incubateFor(int) () from /lib64/libQt5Qml.so.5
#21 0x00007fea4b3e82bc in KDeclarative::QmlObjectIncubationController::incubatingObjectCountChanged(int) () from /lib64/libKF5Declarative.so.5
#22 0x00007fea4a2da919 in QQmlEnginePrivate::incubate(QQmlIncubator&, QQmlContextData*) () from /lib64/libQt5Qml.so.5
#23 0x00007fea4a2d608c in QQmlComponent::create(QQmlIncubator&, QQmlContext*, QQmlContext*) () from /lib64/libQt5Qml.so.5
#24 0x00007fea4b3d793b in KDeclarative::QmlObject::createObjectFromComponent(QQmlComponent*, QQmlContext*, QHash<QString, QVariant> const&) () from /lib64/libKF5Declarative.so.5
#25 0x00007fea4d4b7ccc in PlasmaQuick::AppletQuickItemPrivate::createCompactRepresentationExpanderItem() [clone .part.47] [clone .constprop.59] () from /lib64/libKF5PlasmaQuick.so.5
#26 0x00007fea4d4bb96b in PlasmaQuick::AppletQuickItemPrivate::compactRepresentationCheck() () from /lib64/libKF5PlasmaQuick.so.5
#27 0x00007fea4d4bc459 in PlasmaQuick::AppletQuickItem::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libKF5PlasmaQuick.so.5
#28 0x00007fea4629b15a in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#29 0x00007fea462a7a38 in QTimer::timerEvent(QTimerEvent*) () from /lib64/libQt5Core.so.5
#30 0x00007fea4629bfd3 in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
#31 0x00007fea478224ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#32 0x00007fea47827976 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#33 0x00007fea4626c61b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#34 0x00007fea462c1bad in QTimerInfoList::activateTimers() () from /lib64/libQt5Core.so.5
#35 0x00007fea462c20b1 in timerSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5
#36 0x00007fea405c1e3a in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#37 0x00007fea405c21d0 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#38 0x00007fea405c227c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#39 0x00007fea462c2d8f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#40 0x00007fea46269daa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#41 0x00007fea46271e6c in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#42 0x0000558c51bc5363 in main ()

Reported using DrKonqi
Comment 1 Marco Martin 2015-10-14 15:13:48 UTC 
since is an assert, can you provide the terminal output as well when it crashes?
Comment 2 Garry Williams 2015-10-16 01:16:06 UTC 
From ~/.xsession-errors file, after a recent failure:

kontact(2757)/libakonadi Akonadi::EntityTreeModelPrivate::monitoredItemChanged: Got a stale notification for an item which was already removed. 997719 "" 
[6971:7005:1015/075627:ERROR:socket_stream.cc(208)] Closing stream with result -100
kontact(2757)/libakonadi Akonadi::EntityListCache<T, FetchJob, FetchScope_>::processResult: "Item query returned empty result set" 
QObject::connect: Cannot connect (null)::accessibilityChanged(bool,QString) to Baloo::StorageDevices::slotAccessibilityChanged(bool,QString)
QObject::connect: Cannot connect (null)::accessibilityChanged(bool,QString) to Baloo::StorageDevices::slotAccessibilityChanged(bool,QString)
QObject::connect: Cannot connect (null)::accessibilityChanged(bool,QString) to Baloo::StorageDevices::slotAccessibilityChanged(bool,QString)
QObject::connect: Cannot connect (null)::accessibilityChanged(bool,QString) to Baloo::StorageDevices::slotAccessibilityChanged(bool,QString)
QXcbConnection: XCB error: 3 (BadWindow), sequence: 2036, resource id: 0, major code: 21 (ListProperties), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 24615, resource id: 123732145, major code: 20 (GetProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 24631, resource id: 123732145, major code: 15 (QueryTree), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 24652, resource id: 8388733, major code: 18 (ChangeProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 24655, resource id: 8388733, major code: 12 (ConfigureWindow), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 24656, resource id: 8388733, major code: 25 (SendEvent), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 24706, resource id: 0, major code: 21 (ListProperties), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 24748, resource id: 8388733, major code: 15 (QueryTree), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 24790, resource id: 123732143, major code: 15 (QueryTree), minor code: 0
Failed to register device: "device id 'xrandr-Dell Inc.-DELL P2815Q-WJJGR449CK9M' already exists"
EDID ICC Profile already exists "/home/garry/.local/share/icc/edid-a7d3c88e50c034634b69cd8788a09ff7.icc"
EDID ICC Profile already exists "/home/garry/.local/share/icc/edid-a7d3c88e50c034634b69cd8788a09ff7.icc"
QXcbConnection: XCB error: 3 (BadWindow), sequence: 25015, resource id: 8388748, major code: 15 (QueryTree), minor code: 0
QObject::connect: invalid null parameter
QObject::connect: invalid null parameter
QObject::connect: invalid null parameter
QObject::connect: invalid null parameter
Failed to register device: "device id 'xrandr-Dell Inc.-DELL P2815Q-WJJGR449CK9M' already exists"
Failed to register device: "device id 'xrandr-Dell Inc.-DELL P2815Q-WJJGR449CK9M' already exists"
EDID ICC Profile already exists "/home/garry/.local/share/icc/edid-a7d3c88e50c034634b69cd8788a09ff7.icc"
EDID ICC Profile already exists "/home/garry/.local/share/icc/edid-a7d3c88e50c034634b69cd8788a09ff7.icc"
EDID ICC Profile already exists "/home/garry/.local/share/icc/edid-a7d3c88e50c034634b69cd8788a09ff7.icc"
kscreen.kded: Config does not have at least one screen enabled, WILL NOT save this config, this is not what user wants.
QPainter::begin: Paint device returned engine == 0, type: 2
QPainter::save: Painter not active
QPainter::translate: Painter not active
QPainter::scale: Painter not active
QPainter::worldTransform: Painter not active
QPainter::setPen: Painter not active
QPainter::setBrush: Painter not active

[snip many similar messages]

QPainter::setWorldTransform: Painter not active
QPainter::setOpacity: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::end: Painter not active, aborted
nativeResourceForScreen: null screen
nativeResourceForScreen: null screen
nativeResourceForScreen: null screen
nativeResourceForScreen: null screen
nativeResourceForScreen: null screen
nativeResourceForScreen: null screen
nativeResourceForScreen: null screen
Invalid pixmap specified.
No frame loaded
No frame loaded
No frame loaded
No frame loaded
No frame loaded
No frame loaded
QXcbConnection: XCB error: 3 (BadWindow), sequence: 27763, resource id: 123732232, major code: 15 (QueryTree), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 28205, resource id: 123731973, major code: 18 (ChangeProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 35599, resource id: 109051925, major code: 18 (ChangeProperty), minor code: 0
Comment 3 Garry Williams 2015-10-16 01:22:06 UTC 
System log at time of crash:

oct 15 20:57:04 vfr kernel: usb 2-6: USB disconnect, device number 15
oct 15 20:57:05 vfr kernel: usb 2-6.2: USB disconnect, device number 16
oct 15 20:57:04 vfr acpid[873]: input device has been disconnected, fd 13
oct 15 20:57:05 vfr kernel: usb 2-6: new high-speed USB device number 17 using ehci-pci
oct 15 20:57:06 vfr kernel: [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 163
oct 15 20:57:06 vfr kernel: [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 163
oct 15 20:57:06 vfr kernel: usb 2-6: New USB device found, idVendor=0451, idProduct=8044
oct 15 20:57:06 vfr kernel: usb 2-6: New USB device strings: Mfr=0, Product=0, SerialNumber=1
oct 15 20:57:06 vfr kernel: usb 2-6: SerialNumber: 31020849D31E
oct 15 20:57:06 vfr kernel: hub 2-6:1.0: USB hub found
oct 15 20:57:06 vfr kernel: hub 2-6:1.0: 4 ports detected
oct 15 20:57:06 vfr kernel: usb 2-6.2: new full-speed USB device number 18 using ehci-pci
oct 15 20:57:06 vfr kernel: usb 2-6.2: New USB device found, idVendor=413c, idProduct=a503
oct 15 20:57:06 vfr kernel: usb 2-6.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
oct 15 20:57:06 vfr kernel: usb 2-6.2: Product: Dell AC511 USB SoundBar
oct 15 20:57:06 vfr kernel: usb 2-6.2: Manufacturer: Dell
oct 15 20:57:06 vfr kernel: input: Dell Dell AC511 USB SoundBar as /devices/pci0000:00/0000:00:1d.7/usb2/2-6/2-6.2/2-6.2:1.3/0003:413C:A503.000E/input/input23
oct 15 20:57:06 vfr kernel: hid-generic 0003:413C:A503.000E: input,hidraw5: USB HID v1.00 Device [Dell Dell AC511 USB SoundBar] on usb-0000:00:1d.7-6.2/input3
oct 15 20:57:07 vfr kernel: [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 150
oct 15 20:57:07 vfr kernel: Raw EDID:
oct 15 20:57:07 vfr kernel:          00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 39 7f ff
oct 15 20:57:07 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
oct 15 20:57:07 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
oct 15 20:57:07 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
oct 15 20:57:07 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
oct 15 20:57:07 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
oct 15 20:57:07 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
oct 15 20:57:07 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
oct 15 20:57:07 vfr kernel: [drm:radeon_dvi_detect [radeon]] *ERROR* HDMI-A-1: probed a monitor but no|invalid EDID
oct 15 20:57:07 vfr mtp-probe[18663]: checking bus 2, device 18: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-6/2-6.2"
oct 15 20:57:07 vfr mtp-probe[18663]: bus: 2, device: 18 was not an MTP device
oct 15 20:57:34 vfr cupsd[2747]: REQUEST localhost - - "POST / HTTP/1.1" 200 415 Create-Printer-Subscriptions successful-ok
oct 15 20:57:35 vfr dbus[812]: [system] Activating via systemd: service name='org.bluez' unit='dbus-org.bluez.service'
oct 15 20:57:35 vfr dbus[812]: [system] Activation via systemd failed for unit 'dbus-org.bluez.service': Unit dbus-org.bluez.service failed to load: No such file or directory.
oct 15 20:57:35 vfr dbus[812]: [system] Activating via systemd: service name='org.bluez' unit='dbus-org.bluez.service'
oct 15 20:57:35 vfr dbus[812]: [system] Activation via systemd failed for unit 'dbus-org.bluez.service': Unit dbus-org.bluez.service failed to load: No such file or directory.
Comment 4 Garry Williams 2015-11-20 03:36:02 UTC 
OK, maybe this will help.

The crash happens almost all the time when the monitor is power-cycled.

I started plasma in a terminal that I also ran a journalctl -f command in, too.
So plasma's stdout is interspersed with the system log.

$ rpm -qa|grep plasma
plasma-milou-5.4.3-1.fc23.x86_64
plasma-workspace-5.4.3-2.fc23.x86_64
plasma-nm-openvpn-5.4.3-1.fc23.x86_64
plasma-breeze-common-5.4.3-2.fc23.noarch
plasma-workspace-libs-5.4.3-2.fc23.x86_64
plasma-workspace-common-5.4.3-2.fc23.x86_64
plasma-workspace-geolocation-libs-5.4.3-2.fc23.x86_64
kdeplasma-addons-5.4.3-1.fc23.x86_64
plasma-workspace-geolocation-5.4.3-2.fc23.x86_64
plasma-breeze-5.4.3-2.fc23.x86_64
plasma-desktop-5.4.3-1.fc23.x86_64
kf5-plasma-5.16.0-1.fc23.x86_64
plasma-nm-5.4.3-1.fc23.x86_64
plasma-pa-5.4.3-1.fc23.x86_64
plasma-nm-pptp-5.4.3-1.fc23.x86_64
plasma-workspace-drkonqi-5.4.3-2.fc23.x86_64
kde-settings-plasma-23-8.fc23.noarch
plasma-systemsettings-5.4.3-1.fc23.x86_64
plasma-nm-vpnc-5.4.3-1.fc23.x86_64
$

Here's a recent crash:

Nov 19 22:23:04 vfr kernel: usb 2-6: USB disconnect, device number 11
Nov 19 22:23:04 vfr kernel: usb 2-6.2: USB disconnect, device number 12
Nov 19 22:23:04 vfr acpid[806]: input device has been disconnected, fd 13
Nov 19 22:23:05 vfr kernel: usb 2-6: new high-speed USB device number 13 using ehci-pci
Nov 19 22:23:05 vfr kernel: usb 2-6: New USB device found, idVendor=0451, idProduct=8044
Nov 19 22:23:05 vfr kernel: usb 2-6: New USB device strings: Mfr=0, Product=0, SerialNumber=1
Nov 19 22:23:05 vfr kernel: usb 2-6: SerialNumber: 31020849D31E
Nov 19 22:23:05 vfr kernel: hub 2-6:1.0: USB hub found
Nov 19 22:23:05 vfr kernel: hub 2-6:1.0: 4 ports detected
Nov 19 22:23:05 vfr kernel: usb 2-6.2: new full-speed USB device number 14 using ehci-pci
Nov 19 22:23:05 vfr kernel: usb 2-6.2: New USB device found, idVendor=413c, idProduct=a503
Nov 19 22:23:05 vfr kernel: usb 2-6.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Nov 19 22:23:05 vfr kernel: usb 2-6.2: Product: Dell AC511 USB SoundBar
Nov 19 22:23:05 vfr kernel: usb 2-6.2: Manufacturer: Dell
Nov 19 22:23:05 vfr kernel: input: Dell Dell AC511 USB SoundBar as /devices/pci0000:00/0000:00:1d.7/usb2/2-6/2-6.2/2-6.2:1.3/0003:413C:A503.000C/input/input21
Nov 19 22:23:05 vfr kernel: hid-generic 0003:413C:A503.000C: input,hidraw4: USB HID v1.00 Device [Dell Dell AC511 USB SoundBar] on usb-0000:00:1d.7-6.2/input3
Nov 19 22:23:06 vfr mtp-probe[30946]: checking bus 2, device 14: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-6/2-6.2"
Nov 19 22:23:06 vfr mtp-probe[30946]: bus: 2, device: 14 was not an MTP device
Nov 19 22:23:06 vfr kernel: [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 28
Nov 19 22:23:06 vfr kernel: Raw EDID:
Nov 19 22:23:06 vfr kernel:          00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 3f ff ff
Nov 19 22:23:06 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Nov 19 22:23:06 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Nov 19 22:23:06 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Nov 19 22:23:06 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Nov 19 22:23:06 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Nov 19 22:23:06 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Nov 19 22:23:06 vfr kernel:          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Nov 19 22:23:06 vfr kernel: [drm:radeon_dvi_detect [radeon]] *ERROR* HDMI-A-1: probed a monitor but no|invalid EDID
requesting unexisting screen 0
requesting unexisting screen 0
requesting unexisting screen 0
requesting unexisting screen 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 44342, resource id: 0, major code: 21 (ListProperties), minor code: 0
Application::crashHandler() called with signal 11; recent crashes: 1
/usr/bin/plasmashell  --crashes 1 &
KCrash: Application 'plasmashell' crashing...
KCrash: Attempting to start /usr/libexec/drkonqi from kdeinit
sock_file=/run/user/1000/kdeinit5__0
[1]  + suspended (signal)  plasmashell
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
No metadata file in the package, expected it at: "/usr/share/backgrounds/f23/default/tv-wide//metadata.desktop"
No metadata file in the package, expected it at: "/usr/share/backgrounds/f23/default/tv-wide//metadata.desktop"
No metadata file in the package, expected it at: "/usr/share/backgrounds/f23/default/tv-wide//metadata.desktop"
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/BarMonitor.qml:49:20: Unable to assign [undefined] to QColor
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:68: TypeError: Cannot read property of null
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:153: TypeError: Cannot read property 'value' of undefined
Known plasmoid ids: QHash(("org.kde.plasma.volume", 23)("org.kde.plasma.clipboard", 10)("org.kde.plasma.notifications", 12)("org.kde.plasma.devicenotifier", 11)("org.kde.plasma.printmanager", 13)("org.kde.plasma.battery", 14)("org.kde.plasma.networkmanagement", 15))
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
file:///usr/lib64/qt5/qml/org/kde/plasma/extras/ScrollArea.qml:48: Error: Cannot assign to non-existent property "interactive"
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollBar.qml:91: TypeError: Cannot read property of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollBar.qml:91: TypeError: Cannot read property of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:114: TypeError: Cannot read property 'corner' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:63: TypeError: Cannot read property 'padding' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:64: TypeError: Cannot read property 'padding' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:65: TypeError: Cannot read property 'padding' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:66: TypeError: Cannot read property 'padding' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/ScrollView.qml:286: TypeError: Cannot read property '__wheelScrollLines' of null
file:///usr/share/plasma/plasmoids/org.kde.plasma.clipboard/contents/ui/clipboard.qml:32: TypeError: Cannot read property 'empty' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.clipboard/contents/ui/clipboard.qml:34: TypeError: Cannot read property 'empty' of undefined
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollBar.qml:91: TypeError: Cannot read property of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollBar.qml:91: TypeError: Cannot read property of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:114: TypeError: Cannot read property 'corner' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:63: TypeError: Cannot read property 'padding' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:64: TypeError: Cannot read property 'padding' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:65: TypeError: Cannot read property 'padding' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Private/ScrollViewHelper.qml:66: TypeError: Cannot read property 'padding' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/ScrollView.qml:286: TypeError: Cannot read property '__wheelScrollLines' of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:106:17: Unable to assign [undefined] to QObject*
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:85: TypeError: Cannot read property 'effectivePressed' of undefined
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:106:17: Unable to assign [undefined] to QObject*
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:85: TypeError: Cannot read property 'effectivePressed' of undefined
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:106:17: Unable to assign [undefined] to QObject*
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:85: TypeError: Cannot read property 'effectivePressed' of undefined
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:106:17: Unable to assign [undefined] to QObject*
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:96: TypeError: Cannot read property of null
file:///usr/lib64/qt5/qml/QtQuick/Controls/Button.qml:85: TypeError: Cannot read property 'effectivePressed' of undefined
Nov 19 22:23:31 vfr cupsd[1927]: REQUEST localhost - - "POST / HTTP/1.1" 200 415 Create-Printer-Subscriptions successful-ok
file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:444:5: QML Text: Cannot anchor to a null item.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/printmanager.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/DigitalClock.qml:444:5: QML Text: Binding loop detected for property "height"
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:179: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:179: TypeError: Cannot read property 'value' of undefined
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemloadviewer/contents/ui/SystemLoadViewer.qml:179: TypeError: Cannot read property 'value' of undefined
networkmanager-qt: void NetworkManager::NetworkManagerPrivate::propertiesChanged(const QVariantMap&) Unhandled property "Devices"
file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.networkmanagement/contents/ui/main.qml: QML Plasmoid: Cannot anchor to an item that isn't a parent or sibling.
file:///usr/share/plasma/plasmoids/org.kde.plasma.systemtray/contents/ui/StatusNotifierItem.qml:131:13: QML Image: Failed to get image from provider: image://icon/
[1]  + suspended (signal)  plasmashell
Comment 5 Kim Lindberger 2015-11-29 20:13:57 UTC 
This happens to me too - all that is needed is to disconnect the monitor and plasma crashes every time. If it would be helpful I could try compiling kde with debugging symbols and send a report.
Comment 6 Tobias Klausmann 2015-11-29 21:18:04 UTC 
This happens for me as well on every monitor Off/On Cycle with version 5.4.3, it looks like a regression. It worked with earlier versions, not sure when exactly this started to happen though.

Useful console output:
...
requesting unexisting screen 0
requesting unexisting screen 0
requesting unexisting screen 0
requesting unexisting screen 0
requesting unexisting screen 0
requesting unexisting screen 0
requesting unexisting screen 0
requesting unexisting screen 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 2286, resource id: 0, major code: 21 (ListProperties), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 2336, resource id: 0, major code: 21 (ListProperties), minor code: 0

_(crash)_

gdb backtrace:

Thread 9 (Thread 0x7f0d5ab8d700 (LWP 2284)):
#0  0x00007f0d6ab4f20d in poll () from /lib64/libc.so.6
#1  0x00007f0d6fa0c432 in _xcb_conn_wait () from /usr/lib64/libxcb.so.1
#2  0x00007f0d6fa0e007 in xcb_wait_for_event () from /usr/lib64/libxcb.so.1
#3  0x00007f0d5ccdce29 in ?? () from /usr/lib64/libQt5XcbQpa.so.5
#4  0x00007f0d6b24094f in ?? () from /usr/lib64/libQt5Core.so.5
#5  0x00007f0d6a3564a4 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f0d6ab57b9d in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7f0d53dfa700 (LWP 2285)):
#0  0x00007f0d6ab4f20d in poll () from /lib64/libc.so.6
#1  0x00007f0d67246264 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f0d6724636c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f0d6b46550f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#4  0x00007f0d6b40f63a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#5  0x00007f0d6b23bb1c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f0d6e4e79a5 in ?? () from /usr/lib64/libQt5Qml.so.5
#7  0x00007f0d6b24094f in ?? () from /usr/lib64/libQt5Core.so.5
#8  0x00007f0d6a3564a4 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f0d6ab57b9d in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7f0d46da6700 (LWP 2286)):
#0  0x00007f0d6ab4f20d in poll () from /lib64/libc.so.6
#1  0x00007f0d67246264 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f0d6724636c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f0d6b46550f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#4  0x00007f0d6b40f63a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#5  0x00007f0d6b23bb1c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f0d6e4e79a5 in ?? () from /usr/lib64/libQt5Qml.so.5
#7  0x00007f0d6b24094f in ?? () from /usr/lib64/libQt5Core.so.5
#8  0x00007f0d6a3564a4 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f0d6ab57b9d in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7f0d4530c700 (LWP 2289)):
#0  0x00007f0d6ab4f20d in poll () from /lib64/libc.so.6
#1  0x00007f0d67246264 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f0d6724636c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f0d6b46550f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#4  0x00007f0d6b40f63a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#5  0x00007f0d6b23bb1c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f0d6e4e79a5 in ?? () from /usr/lib64/libQt5Qml.so.5
#7  0x00007f0d6b24094f in ?? () from /usr/lib64/libQt5Core.so.5
#8  0x00007f0d6a3564a4 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f0d6ab57b9d in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7f0d3f99e700 (LWP 2290)):
#0  0x00007f0d6a35c07f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f0d70c7ba84 in ?? () from /usr/lib64/libQt5Script.so.5
#2  0x00007f0d70c7bac9 in ?? () from /usr/lib64/libQt5Script.so.5
#3  0x00007f0d6a3564a4 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f0d6ab57b9d in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f0cb7fff700 (LWP 2291)):
#0  0x00007f0d6ab4f20d in poll () from /lib64/libc.so.6
#1  0x00007f0d67246264 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f0d6724636c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f0d6b46552b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#4  0x00007f0d6b40f63a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#5  0x00007f0d6b23bb1c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f0d6f069e42 in ?? () from /usr/lib64/libQt5Quick.so.5
#7  0x00007f0d6b24094f in ?? () from /usr/lib64/libQt5Core.so.5
#8  0x00007f0d6a3564a4 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f0d6ab57b9d in clone () from /lib64/libc.so.6

---Type <return> to continue, or q <return> to quit---
Thread 3 (Thread 0x7f0caba19700 (LWP 2293)):
#0  0x00007f0d6ab4f20d in poll () from /lib64/libc.so.6
#1  0x00007f0d67246264 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f0d6724636c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f0d6b46550f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#4  0x00007f0d6b40f63a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#5  0x00007f0d6b23bb1c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f0cadf2ce47 in KCupsConnection::run() () from /usr/lib64/libkcupslib.so
#7  0x00007f0d6b24094f in ?? () from /usr/lib64/libQt5Core.so.5
#8  0x00007f0d6a3564a4 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f0d6ab57b9d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f0ca89de700 (LWP 2294)):
#0  0x00007f0d6a35c428 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f0d6b241a06 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQt5Core.so.5
#2  0x00007f0d6b23d6ab in ?? () from /usr/lib64/libQt5Core.so.5
#3  0x00007f0d6b24094f in ?? () from /usr/lib64/libQt5Core.so.5
#4  0x00007f0d6a3564a4 in start_thread () from /lib64/libpthread.so.0
#5  0x00007f0d6ab57b9d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f0d715a38c0 (LWP 2283)):
#0  0x00007f0d6b979320 in QScreen::handle() const () from /usr/lib64/libQt5Gui.so.5
#1  0x00007f0d5cce46e9 in QXcbIntegration::createPlatformWindow(QWindow*) const ()
   from /usr/lib64/libQt5XcbQpa.so.5
#2  0x00007f0d6b95c0d7 in QWindowPrivate::create(bool) () from /usr/lib64/libQt5Gui.so.5
#3  0x00007f0d6b95c368 in QWindow::winId() const () from /usr/lib64/libQt5Gui.so.5
#4  0x00007f0d70fa8d65 in ?? () from /usr/lib64/libKF5PlasmaQuick.so.5
#5  0x00007f0d70fab6d9 in ?? () from /usr/lib64/libKF5PlasmaQuick.so.5
#6  0x00007f0d6b43ef8a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5
#7  0x00007f0d6b43ee17 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5
#8  0x00007f0d6b43ef8a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5
#9  0x00007f0d6b44b0e8 in QTimer::timerEvent(QTimerEvent*) () from /usr/lib64/libQt5Core.so.5
#10 0x00007f0d6b43fd2b in QObject::event(QEvent*) () from /usr/lib64/libQt5Core.so.5
#11 0x00007f0d6c7878cc in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib64/libQt5Widgets.so.5
#12 0x00007f0d6c78c9d6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#13 0x00007f0d6b411cf3 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#14 0x00007f0d6b4643bd in QTimerInfoList::activateTimers() () from /usr/lib64/libQt5Core.so.5
#15 0x00007f0d6b4648d1 in ?? () from /usr/lib64/libQt5Core.so.5
#16 0x00007f0d67246097 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#17 0x00007f0d672462c8 in ?? () from /usr/lib64/libglib-2.0.so.0
#18 0x00007f0d6724636c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#19 0x00007f0d6b46550f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#20 0x00007f0d6b40f63a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib64/libQt5Core.so.5
#21 0x00007f0d6b4172fd in QCoreApplication::exec() () from /usr/lib64/libQt5Core.so.5
#22 0x0000000000434150 in main ()
Comment 7 Marco Martin 2015-12-03 16:10:30 UTC 
can you reproduce and get the console output as well when the assert gets hit?
Comment 8 Tobias Klausmann 2015-12-03 16:43:12 UTC 
(In reply to Marco Martin from comment #7)
> can you reproduce and get the console output as well when the assert gets
> hit?

It is reproducible and the output is (already stated above):

Useful console output: 
... 
requesting unexisting screen 0 
requesting unexisting screen 0 
requesting unexisting screen 0 
requesting unexisting screen 0 
requesting unexisting screen 0 
requesting unexisting screen 0 
requesting unexisting screen 0 
requesting unexisting screen 0 
QXcbConnection: XCB error: 3 (BadWindow), sequence: 2286, resource id: 0, major code: 21 (ListProperties), minor code: 0 
QXcbConnection: XCB error: 3 (BadWindow), sequence: 2336, resource id: 0, major code: 21 (ListProperties), minor code: 0


Maybe it is important to say: This is a notebook connected to an external monitor, where the internal monitor is disabled, thus when disabling the external monitor, the last output goes away. _Maybe_ the unexisting screen 0 is the internal notebook lcd...
Comment 9 e8hffff 2015-12-06 20:21:58 UTC 
Try : In >Startup and Shutdown>Background Serivces>  untick "KScreen2" and reboot.
Comment 10 Tobias Klausmann 2015-12-07 00:40:15 UTC 
(In reply to e8hffff from comment #9)
> Try : In >Startup and Shutdown>Background Serivces>  untick "KScreen2" and
> reboot.

I'm not sure what you have in mind with this, this lets my system just "forget" my monitor setup. Applying the above mentioned monitor setup after your suggestion (disable and reboot) results in the same crash as noted in Comment #6.
Comment 11 David Edmundson 2015-12-14 13:32:36 UTC 

*** This bug has been marked as a duplicate of bug 341497 ***