Application: plasmashell (5.9.4)

Qt Version: 5.8.0
Frameworks Version: 5.32.0
Operating System: Linux 4.9.20-1-MANJARO x86_64
Distribution: "Manjaro Linux"

-- Information about the crash:
- What I was doing when the application crashed:
nothing,just opened the computer,clicked the top-left button on kde plasma desktop(dont know its official name,sorry)and then screen went black.
if I restart it in the console by running "plasmashell",and did the same trick,i can see the informations after i click the button:

KCrash: Attempting to start /usr/bin/plasmashell from kdeinit
sock_file=/run/user/1000/kdeinit5__0
KCrash: Application 'plasmashell' crashing...
KCrash: Attempting to start /usr/lib/drkonqi from kdeinit
sock_file=/run/user/1000/kdeinit5__0
QSocketNotifier: Invalid socket 8 and type 'Read', disabling...
QSocketNotifier: Invalid socket 11 and type 'Read', disabling...
QSocketNotifier: Invalid socket 9 and type 'Read', disabling...
QSocketNotifier: Invalid socket 20 and type 'Read', disabling...

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f29cdc14800 (LWP 1382))]

Thread 8 (Thread 0x7f28ff43e700 (LWP 1389)):
#0  0x00007f29c20f9e49 in g_mutex_lock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f29c20b3c99 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#2  0x00007f29c20b46cb in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f29c20b48bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f29c7bf506b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f29c7b9e89a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f29c79c0a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f2901ddc0a7 in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#8  0x00007f29c79c56d8 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f29c687a2e7 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f29c72d854f in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f2912ff9700 (LWP 1388)):
#0  0x00007f29c72ce67d in poll () at /usr/lib/libc.so.6
#1  0x00007f29c20b47a6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f29c20b48bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f29c7bf506b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f29c7b9e89a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f29c79c0a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f29cb6abfd6 in  () at /usr/lib/libQt5Quick.so.5
#7  0x00007f29c79c56d8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f29c687a2e7 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f29c72d854f in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f29a3fff700 (LWP 1387)):
#0  0x00007f29c6880756 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f29cd39f234 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f29cd39f279 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f29c687a2e7 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f29c72d854f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f29ae398700 (LWP 1386)):
#0  0x00007f29c72ca37d in read () at /usr/lib/libc.so.6
#1  0x00007f29c20f8aa0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f29c20b426e in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f29c20b4744 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f29c20b48bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f29c7bf506b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f29c7b9e89a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f29c79c0a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f29caaf8025 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f29c79c56d8 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f29c687a2e7 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f29c72d854f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f29afdfa700 (LWP 1385)):
#0  0x00007f29c72e513f in __libc_enable_asynccancel () at /usr/lib/libc.so.6
#1  0x00007f29c72ce672 in poll () at /usr/lib/libc.so.6
#2  0x00007f29c20b47a6 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f29c20b48bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f29c7bf506b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f29c7b9e89a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f29c79c0a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f29caaf8025 in  () at /usr/lib/libQt5Qml.so.5
#8  0x00007f29c79c56d8 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f29c687a2e7 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f29c72d854f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f29b5e92700 (LWP 1384)):
#0  0x00007f29c72ce67d in poll () at /usr/lib/libc.so.6
#1  0x00007f29c20b47a6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f29c20b48bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f29c7bf506b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f29c7b9e89a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f29c79c0a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f29c8745125 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f29c79c56d8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f29c687a2e7 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f29c72d854f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f29b7c9a700 (LWP 1383)):
#0  0x00007f29c72ce67d in poll () at /usr/lib/libc.so.6
#1  0x00007f29cc2c58e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f29cc2c7679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f29ba20c239 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f29c79c56d8 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f29c687a2e7 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f29c72d854f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f29cdc14800 (LWP 1382)):
[KCrash Handler]
#6  0x00007f29cb756d16 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) () at /usr/lib/libQt5Quick.so.5
#7  0x00007f29cb756dea in QQuickItemPrivate::setEffectiveVisibleRecur(bool) () at /usr/lib/libQt5Quick.so.5
#8  0x00007f29cb756dea in QQuickItemPrivate::setEffectiveVisibleRecur(bool) () at /usr/lib/libQt5Quick.so.5
#9  0x00007f29cb756f44 in QQuickItem::setVisible(bool) () at /usr/lib/libQt5Quick.so.5
#10 0x00007f29cd6d283c in  () at /usr/lib/libKF5PlasmaQuick.so.5
#11 0x00007f29cd6d3f7e in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#12 0x00007f29c8b0e34c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#13 0x00007f29c8b15b61 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#14 0x00007f29c7ba0440 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#15 0x00007f29c80f778e in QWindow::setVisible(bool) () at /usr/lib/libQt5Gui.so.5
#16 0x00007f29cd6d0134 in PlasmaQuick::Dialog::setVisible(bool) () at /usr/lib/libKF5PlasmaQuick.so.5
#17 0x00007f29cd6d2fc8 in  () at /usr/lib/libKF5PlasmaQuick.so.5
#18 0x00007f29cd6d471b in PlasmaQuick::Dialog::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/libKF5PlasmaQuick.so.5
#19 0x00007f29caa6bac9 in  () at /usr/lib/libQt5Qml.so.5
#20 0x00007f29caa6a498 in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyData::WriteFlag>) () at /usr/lib/libQt5Qml.so.5
#21 0x00007f29caa34b7b in QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData*, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#22 0x00007f29caa35390 in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*, QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#23 0x00007f29caa354a6 in QV4::QObjectWrapper::put(QV4::Managed*, QV4::String*, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#24 0x00007f29caa45f56 in QV4::Runtime::method_setProperty(QV4::ExecutionEngine*, QV4::Value const&, int, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#25 0x00007f2913b79f42 in  ()
#26 0x0000000000000018 in  ()
#27 0x00007f2913b7a504 in  ()
#28 0x0000000000000000 in  ()

Reported using DrKonqi