Application: plasmashell (5.8.7)

Qt Version: 5.6.2
Frameworks Version: 5.32.0
Operating System: Linux 4.4.92-31-default x86_64
Distribution: "openSUSE Leap 42.3"

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

I was using my computer for some time with multiple programs opened, using like 75% of RAM available (4.44GB / 5.76GB approximately this time).
Also, most of the time I only suspend the computer, but in this occasion I suspended it maybe three times, it has uptime for 1 day and 9 hours.
I am a big fan of the alt + tab shortcut, I think that this could be causing some trouble because previously plasma crashes just after using it.

Doing this makes the same problem at some point of using it, the maximum that I remember is 10 days without a reboot.
Sometimes it crashes but then recovers. But it also happens that plasma freezes. I can change to the console, but even killing all the programs and restarting plasma don't solve anything.
After a reboot in both cases, it works well.

- Unusual behavior I noticed:

Most of the programs turns a little slow at first, then the slowness increases.
It's pretty visible playing videos in youtube, scrolling in a webpage or in another programs.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fe9bb04b900 (LWP 2447))]

Thread 7 (Thread 0x7fe8f8254700 (LWP 2537)):
#0  0x00007fe9b453920d in poll () at /lib64/libc.so.6
#1  0x00007fe9b0bea314 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007fe9b0bea42c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3  0x00007fe9b4e461ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007fe9b4df3bfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007fe9b4c2ef5a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007fe8f967d8f7 in KCupsConnection::run() () at /usr/lib64/libkcupslib.so
#7  0x00007fe9b4c33a29 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007fe9b3d42744 in start_thread () at /lib64/libpthread.so.0
#9  0x00007fe9b4541aad in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7fe9029b0700 (LWP 2528)):
#0  0x00007ffc498e7b62 in clock_gettime ()
#1  0x00007fe9b454e576 in clock_gettime () at /lib64/libc.so.6
#2  0x00007fe9b4cdea46 in  () at /usr/lib64/libQt5Core.so.5
#3  0x00007fe9b4e44809 in QTimerInfoList::updateCurrentTime() () at /usr/lib64/libQt5Core.so.5
#4  0x00007fe9b4e44d85 in QTimerInfoList::timerWait(timespec&) () at /usr/lib64/libQt5Core.so.5
#5  0x00007fe9b4e45f7e in  () at /usr/lib64/libQt5Core.so.5
#6  0x00007fe9b0be995d in g_main_context_prepare () at /usr/lib64/libglib-2.0.so.0
#7  0x00007fe9b0bea230 in  () at /usr/lib64/libglib-2.0.so.0
#8  0x00007fe9b0bea42c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#9  0x00007fe9b4e461ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#10 0x00007fe9b4df3bfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#11 0x00007fe9b4c2ef5a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#12 0x00007fe9b8ac0822 in  () at /usr/lib64/libQt5Quick.so.5
#13 0x00007fe9b4c33a29 in  () at /usr/lib64/libQt5Core.so.5
#14 0x00007fe9b3d42744 in start_thread () at /lib64/libpthread.so.0
#15 0x00007fe9b4541aad in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7fe9955e5700 (LWP 2527)):
#0  0x00007fe9b3d470bf in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007fe9ba72593b in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007fe9ba725969 in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007fe9b3d42744 in start_thread () at /lib64/libpthread.so.0
#4  0x00007fe9b4541aad in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7fe9973be700 (LWP 2526)):
#0  0x00007fe9b4cdea4f in  () at /usr/lib64/libQt5Core.so.5
#1  0x00007fe9b4e44809 in QTimerInfoList::updateCurrentTime() () at /usr/lib64/libQt5Core.so.5
#2  0x00007fe9b4e44d85 in QTimerInfoList::timerWait(timespec&) () at /usr/lib64/libQt5Core.so.5
#3  0x00007fe9b4e45f7e in  () at /usr/lib64/libQt5Core.so.5
#4  0x00007fe9b0be995d in g_main_context_prepare () at /usr/lib64/libglib-2.0.so.0
#5  0x00007fe9b0bea230 in  () at /usr/lib64/libglib-2.0.so.0
#6  0x00007fe9b0bea42c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#7  0x00007fe9b4e461ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#8  0x00007fe9b4df3bfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#9  0x00007fe9b4c2ef5a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#10 0x00007fe9b7f3c3d8 in  () at /usr/lib64/libQt5Qml.so.5
#11 0x00007fe9b4c33a29 in  () at /usr/lib64/libQt5Core.so.5
#12 0x00007fe9b3d42744 in start_thread () at /lib64/libpthread.so.0
#13 0x00007fe9b4541aad in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7fe99cd86700 (LWP 2525)):
#0  0x00007fe9b453920d in poll () at /lib64/libc.so.6
#1  0x00007fe9b0bea314 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007fe9b0bea42c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3  0x00007fe9b4e461ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007fe9b4df3bfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007fe9b4c2ef5a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007fe9b7f3c3d8 in  () at /usr/lib64/libQt5Qml.so.5
#7  0x00007fe9b4c33a29 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007fe9b3d42744 in start_thread () at /lib64/libpthread.so.0
#9  0x00007fe9b4541aad in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7fe9a8191700 (LWP 2462)):
#0  0x00007fe9b453528d in read () at /lib64/libc.so.6
#1  0x00007fe9b0c2a750 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007fe9b0be9e49 in g_main_context_check () at /usr/lib64/libglib-2.0.so.0
#3  0x00007fe9b0bea2a8 in  () at /usr/lib64/libglib-2.0.so.0
#4  0x00007fe9b0bea42c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#5  0x00007fe9b4e461ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#6  0x00007fe9b4df3bfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#7  0x00007fe9b4c2ef5a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#8  0x00007fe9b525a295 in  () at /usr/lib64/libQt5DBus.so.5
#9  0x00007fe9b4c33a29 in  () at /usr/lib64/libQt5Core.so.5
#10 0x00007fe9b3d42744 in start_thread () at /lib64/libpthread.so.0
#11 0x00007fe9b4541aad in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7fe9bb04b900 (LWP 2447)):
[KCrash Handler]
#6  0x00007fe90bac3968 in  () at /usr/lib64/dri/i965_dri.so
#7  0x00007fe90baa98ac in  () at /usr/lib64/dri/i965_dri.so
#8  0x00007fe9b8af3838 in QSGBatchRenderer::Renderer::renderBatches() () at /usr/lib64/libQt5Quick.so.5
#9  0x00007fe9b8af9d94 in QSGBatchRenderer::Renderer::render() () at /usr/lib64/libQt5Quick.so.5
#10 0x00007fe9b8b055e2 in QSGRenderer::renderScene(QSGBindable const&) () at /usr/lib64/libQt5Quick.so.5
#11 0x00007fe9b8b05dfb in QSGRenderer::renderScene(unsigned int) () at /usr/lib64/libQt5Quick.so.5
#12 0x00007fe9b8b14b6e in QSGRenderContext::renderNextFrame(QSGRenderer*, unsigned int) () at /usr/lib64/libQt5Quick.so.5
#13 0x00007fe9b8b5b1f9 in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib64/libQt5Quick.so.5
#14 0x00007fe9b8b2afd1 in  () at /usr/lib64/libQt5Quick.so.5
#15 0x00007fe9b8b2c185 in  () at /usr/lib64/libQt5Quick.so.5
#16 0x00007fe9b5d7828c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#17 0x00007fe9b5d7c8ea in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#18 0x00007fe9b4df5be5 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#19 0x00007fe9b4e45afe in QTimerInfoList::activateTimers() () at /usr/lib64/libQt5Core.so.5
#20 0x00007fe9b4e45ec1 in  () at /usr/lib64/libQt5Core.so.5
#21 0x00007fe9b0bea134 in g_main_context_dispatch () at /usr/lib64/libglib-2.0.so.0
#22 0x00007fe9b0bea388 in  () at /usr/lib64/libglib-2.0.so.0
#23 0x00007fe9b0bea42c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#24 0x00007fe9b4e4618c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#25 0x00007fe9b4df3bfb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#26 0x00007fe9b4dfbae6 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#27 0x000000000041f0ff in  ()
#28 0x00007fe9b44786e5 in __libc_start_main () at /lib64/libc.so.6
#29 0x000000000041f369 in _start ()

Reported using DrKonqi