Application: plasmashell (5.12.5)

Qt Version: 5.10.1
Frameworks Version: 5.46.0
Operating System: Linux 4.17.0-0.rc5.git1.1.fc29.x86_64 x86_64
Distribution: "Fedora release 29 (Rawhide)"

-- Information about the crash:
- What I was doing when the application crashed:
I was using Firefox, then tried to swap to another open window but clicking on any of other windows didn't work (both already open windows and start menu)
- Unusual behavior I noticed:
I can xkill plasma workspace (dashboard), everything comes back to normal then reverts to frozen again after some time
- Custom settings of the application:

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
[KCrash Handler]
#6  0x0000000000000000 in  ()
#7  0x00007f9a47c8cff2 in Plasma::DataEngineManagerPrivate::~DataEngineManagerPrivate() (this=0x55840a214020, __in_chrg=<optimized out>) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasma/private/dataenginemanager.cpp:63
#8  0x00007f9a47c8cff2 in Plasma::DataEngineManager::~DataEngineManager() (this=0x7f9a47ee8110 <Plasma::(anonymous namespace)::Q_QGS_privateDataEngineManagerSelf::innerFunction()::holder>, __in_chrg=<optimized out>) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasma/private/dataenginemanager.cpp:103
#9  0x00007f9a47c8d15d in Plasma::DataEngineManagerSingleton::~DataEngineManagerSingleton() (this=<optimized out>, __in_chrg=<optimized out>) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasma/private/dataenginemanager.cpp:82
#10 0x00007f9a47c8d15d in Plasma::(anonymous namespace)::Q_QGS_privateDataEngineManagerSelf::Holder::~Holder() (this=<optimized out>, __in_chrg=<optimized out>) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasma/private/dataenginemanager.cpp:88
#11 0x00007f9a42b9d6ac in  () at /lib64/libc.so.6
#12 0x00007f9a42b9d7dc in  () at /lib64/libc.so.6
#13 0x00007f9a4857ad19 in _XDefaultIOError () at /lib64/libX11.so.6
#14 0x00007f9a29e6f4ab in  () at /lib64/libQt5XcbQpa.so.5
#15 0x00007f9a4857af52 in _XIOError () at /lib64/libX11.so.6
#16 0x00007f9a485781f8 in require_socket.part () at /lib64/libX11.so.6
#17 0x00007f9a485789dd in _XFlush () at /lib64/libX11.so.6
#18 0x00007f9a4857b5ad in _XGetRequest () at /lib64/libX11.so.6
#19 0x00007f9a485571b1 in XCreatePixmap () at /lib64/libX11.so.6
#20 0x0000558408049532 in  ()
#21 0x000055840804bee7 in  ()
#22 0x000055840804c168 in  ()
#23 0x000055840804c1cd in  ()
#24 0x00007f9a42b9d6ac in  () at /lib64/libc.so.6
#25 0x00007f9a42b9d7dc in  () at /lib64/libc.so.6
#26 0x00007f9a4857ad19 in _XDefaultIOError () at /lib64/libX11.so.6
#27 0x00007f9a29e6f4ab in  () at /lib64/libQt5XcbQpa.so.5
#28 0x00007f9a4857af52 in _XIOError () at /lib64/libX11.so.6
#29 0x00007f9a485781f8 in require_socket.part () at /lib64/libX11.so.6
#30 0x00007f9a485789dd in _XFlush () at /lib64/libX11.so.6
#31 0x00007f9a4857b5ad in _XGetRequest () at /lib64/libX11.so.6
#32 0x00007f9a485571b1 in XCreatePixmap () at /lib64/libX11.so.6
#33 0x00007f9a4993b502 in DialogShadows::Private::createPixmap(QPixmap const&) (this=0x55840aa1c6d0, source=...) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasmaquick/dialogshadows.cpp:233
#34 0x00007f9a4993deb7 in DialogShadows::Private::freeX11Pixmaps() (this=this@entry=0x55840aa1c6d0) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasmaquick/dialogshadows.cpp:466
#35 0x00007f9a4993e138 in DialogShadows::Private::freeX11Pixmaps() (this=0x55840aa1c6d0) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasmaquick/dialogshadows.cpp:106
#36 0x00007f9a4993e138 in DialogShadows::Private::~Private() (this=0x55840aa1c6d0, __in_chrg=<optimized out>) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasmaquick/dialogshadows.cpp:63
#37 0x00007f9a4993e138 in DialogShadows::~DialogShadows() (this=0x7f9a49b6d0a0 <(anonymous namespace)::Q_QGS_privateDialogShadowsSelf::innerFunction()::holder>, __in_chrg=<optimized out>) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasmaquick/dialogshadows.cpp:142
#38 0x00007f9a4993e19d in DialogShadowsSingleton::~DialogShadowsSingleton() (this=<optimized out>, __in_chrg=<optimized out>) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasmaquick/dialogshadows.cpp:120
#39 0x00007f9a4993e19d in (anonymous namespace)::Q_QGS_privateDialogShadowsSelf::Holder::~Holder() (this=<optimized out>, __in_chrg=<optimized out>) at /usr/src/debug/kf5-plasma-5.46.0-1.fc29.x86_64/src/plasmaquick/dialogshadows.cpp:130
#40 0x00007f9a42b9d6ac in  () at /lib64/libc.so.6
#41 0x00007f9a42b9d7dc in  () at /lib64/libc.so.6
#42 0x00007f9a29e75c23 in QXcbConnection::processXcbEvents() () at /lib64/libQt5XcbQpa.so.5
#43 0x00007f9a43ae3986 in QObject::event(QEvent*) () at /lib64/libQt5Core.so.5
#44 0x00007f9a4444eeb5 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#45 0x00007f9a4445685a in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#46 0x00007f9a43aba286 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#47 0x00007f9a43abcfab in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib64/libQt5Core.so.5
#48 0x00007f9a43b0ae57 in  () at /lib64/libQt5Core.so.5
#49 0x00007f9a3b50d7cd in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#50 0x00007f9a3b50db98 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#51 0x00007f9a3b50dc30 in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#52 0x00007f9a43b0aba3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#53 0x00007f9a29f01065 in  () at /lib64/libQt5XcbQpa.so.5
#54 0x00007f9a43ab902b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#55 0x00007f9a43ac14c6 in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#56 0x0000558408034ed8 in  ()
#57 0x00007f9a42b871bb in __libc_start_main () at /lib64/libc.so.6
#58 0x000055840803526a in _start ()

Reported using DrKonqi