Application: plasmashell (5.8.2)

Qt Version: 5.7.0
Frameworks Version: 5.27.0
Operating System: Linux 4.8.2-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
Plasma crashes from time to time while I'm working. Not related to any app in particular, and not very often. It just 'refresh' the plasma objects in my screen, taking about 30s to put my objects back in place, fully operational.
I've 2 plasma panels, #1 is always visible at the ottom of my screen, it includes application launcher, digital clock, task manager, lock button, systry. #2 is not always visible, it's placed at the top of my screen, centered, and width=75%. It includes App Launcher and Icons for common apps.
I'm not using any extra plasma objects in my desktop.

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 0x7fd587ea3800 (LWP 751))]

Thread 6 (Thread 0x7fd4cc5a3700 (LWP 965)):
#0  0x00007fd5815b94ed in read () at /usr/lib/libc.so.6
#1  0x00007fd57c8c9a10 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fd57c885235 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007fd57c885724 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007fd57c88589c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007fd581edf72b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007fd581e8923a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007fd581cac0f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007fd4ceacf0a7 in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#9  0x00007fd581cb0d78 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007fd580dc0454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007fd5815c67df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7fd5620c6700 (LWP 852)):
#0  0x00007fd580dc610f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fd58763eac4 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007fd58763eb09 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007fd580dc0454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fd5815c67df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7fd563dc7700 (LWP 843)):
#0  0x00007fd5815b94ed in read () at /usr/lib/libc.so.6
#1  0x00007fd57c8c9a10 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fd57c885235 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007fd57c885724 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007fd57c88589c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007fd581edf72b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007fd581e8923a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007fd581cac0f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007fd58500f2d5 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007fd581cb0d78 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007fd580dc0454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007fd5815c67df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7fd569a43700 (LWP 839)):
#0  0x00007fd5815bd48d in poll () at /usr/lib/libc.so.6
#1  0x00007fd57c885786 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fd57c88589c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fd581edf72b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fd581e8923a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007fd581cac0f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007fd58500f2d5 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007fd581cb0d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007fd580dc0454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007fd5815c67df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7fd56b48b700 (LWP 782)):
#0  0x00007fd581edecb5 in  () at /usr/lib/libQt5Core.so.5
#1  0x00007fd57c884c89 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#2  0x00007fd57c8856ab in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007fd57c88589c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007fd581edf72b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007fd581e8923a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007fd581cac0f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007fd582a2ce55 in  () at /usr/lib/libQt5DBus.so.5
#8  0x00007fd581cb0d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007fd580dc0454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007fd5815c67df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7fd587ea3800 (LWP 751)):
[KCrash Handler]
#6  0x00007fd560d50567 in  () at /usr/lib/xorg/modules/dri/i965_dri.so
#7  0x00007fd560d22363 in  () at /usr/lib/xorg/modules/dri/i965_dri.so
#8  0x00007fd585bdda0a in QSGBatchRenderer::Renderer::renderBatches() () at /usr/lib/libQt5Quick.so.5
#9  0x00007fd585be32f5 in QSGBatchRenderer::Renderer::render() () at /usr/lib/libQt5Quick.so.5
#10 0x00007fd585beebff in QSGRenderer::renderScene(QSGBindable const&) () at /usr/lib/libQt5Quick.so.5
#11 0x00007fd585bef2cb in QSGRenderer::renderScene(unsigned int) () at /usr/lib/libQt5Quick.so.5
#12 0x00007fd585bfeebe in QSGRenderContext::renderNextFrame(QSGRenderer*, unsigned int) () at /usr/lib/libQt5Quick.so.5
#13 0x00007fd585c4817e in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/libQt5Quick.so.5
#14 0x00007fd585c157f5 in  () at /usr/lib/libQt5Quick.so.5
#15 0x00007fd585c52a25 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#16 0x00007fd587972bab in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#17 0x00007fd4d70700bd in  () at /usr/lib/qt/qml/org/kde/plasma/core/libcorebindingsplugin.so
#18 0x00007fd582df5e0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#19 0x00007fd582dfd581 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#20 0x00007fd581e8ade0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#21 0x00007fd5823e4bbe in QWindowPrivate::deliverUpdateRequest() () at /usr/lib/libQt5Gui.so.5
#22 0x00007fd5823e5109 in QWindow::event(QEvent*) () at /usr/lib/libQt5Gui.so.5
#23 0x00007fd585c52883 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#24 0x00007fd587972bab in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#25 0x00007fd4d70700bd in  () at /usr/lib/qt/qml/org/kde/plasma/core/libcorebindingsplugin.so
#26 0x00007fd582df5e0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#27 0x00007fd582dfd581 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#28 0x00007fd581e8ade0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#29 0x00007fd581ede6ae in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#30 0x00007fd581edebd1 in  () at /usr/lib/libQt5Core.so.5
#31 0x00007fd57c885587 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#32 0x00007fd57c8857f0 in  () at /usr/lib/libglib-2.0.so.0
#33 0x00007fd57c88589c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#34 0x00007fd581edf70f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#35 0x00007fd581e8923a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#36 0x00007fd581e9173c in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#37 0x000000000041c8b2 in  ()
#38 0x00007fd5814fe291 in __libc_start_main () at /usr/lib/libc.so.6
#39 0x000000000041cc3a in _start ()

Reported using DrKonqi