Application: plasma-discover (5.14.0)
 (Compiled from sources)
Qt Version: 5.12.0
Frameworks Version: 5.50.0
Operating System: Linux 4.19.0-rc7-mainline x86_64
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed:
Opening the setting on discover.
- ArchLinux Latest(testing user)
- kde-unstable
- qt5-5.12beta

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f1de477ec80 (LWP 2558))]

Thread 11 (Thread 0x7f1db9563700 (LWP 2573)):
#0  0x00007f1de960b7a4 in read () at /usr/lib/libc.so.6
#1  0x00007f1de7de7781 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f1de7e37a50 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f1de7e38e86 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f1de7e38fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f1de9b443c4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f1de9aed3fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f1de9931589 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f1de993298c in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f1de88caa9d in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f1de961ab23 in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f1dbaffd700 (LWP 2567)):
#0  0x00007f1de7e37883 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#1  0x00007f1de7e38e86 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f1de7e38fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f1de9b443c4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f1de9aed3fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f1de9931589 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f1de993298c in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f1de88caa9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f1de961ab23 in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f1dbb7fe700 (LWP 2566)):
#0  0x00007f1de960b7a4 in read () at /usr/lib/libc.so.6
#1  0x00007f1de7de7781 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f1de7e37a50 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f1de7e38e86 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f1de7e38fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f1de9b443c4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f1de9aed3fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f1de9931589 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f1de993298c in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f1de88caa9d in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f1de961ab23 in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f1dbbfff700 (LWP 2565)):
#0  0x00007f1de960fc21 in poll () at /usr/lib/libc.so.6
#1  0x00007f1de7e38ee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f1de7e39f62 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#3  0x00007f1dca2ecc28 in  () at /usr/lib/libgio-2.0.so.0
#4  0x00007f1de7e023eb in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007f1de88caa9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f1de961ab23 in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f1dc8951700 (LWP 2564)):
#0  0x00007f1de960fc21 in poll () at /usr/lib/libc.so.6
#1  0x00007f1de7e38ee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f1de7e38fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f1de7e39022 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f1de7e023eb in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007f1de88caa9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f1de961ab23 in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f1dcad44700 (LWP 2563)):
#0  0x00007f1de7de778c in  () at /usr/lib/libglib-2.0.so.0
#1  0x00007f1de7e37a50 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#2  0x00007f1de7e38e86 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f1de7e38fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f1de9b443c4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f1de9aed3fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f1de9931589 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f1deb44670b in  () at /usr/lib/libQt5Quick.so.5
#8  0x00007f1de993298c in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f1de88caa9d in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f1de961ab23 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f1dcbf97700 (LWP 2562)):
#0  0x00007f1de88d0afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f1dcc3f017c in  () at /usr/lib/dri/i965_dri.so
#2  0x00007f1dcc3efeb8 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007f1de88caa9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f1de961ab23 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f1dda186700 (LWP 2561)):
#0  0x00007f1de960fc21 in poll () at /usr/lib/libc.so.6
#1  0x00007f1de7e38ee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f1de7e38fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f1de9b443c4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f1de9aed3fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f1de9931589 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f1dea140e19 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f1de993298c in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f1de88caa9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f1de961ab23 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f1de082d700 (LWP 2560)):
#0  0x00007f1de960fc21 in poll () at /usr/lib/libc.so.6
#1  0x00007f1de7e38ee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f1de7e38fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f1de9b443c4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f1de9aed3fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f1de9931589 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f1deaf07ba6 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f1de993298c in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f1de88caa9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f1de961ab23 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f1de2a6b700 (LWP 2559)):
#0  0x00007f1de960fc21 in poll () at /usr/lib/libc.so.6
#1  0x00007f1de7dae630 in  () at /usr/lib/libxcb.so.1
#2  0x00007f1de7db02db in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f1de3ff384a in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f1de993298c in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f1de88caa9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f1de961ab23 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f1de477ec80 (LWP 2558)):
[KCrash Handler]
#6  0x00007f1de9b1b673 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f1de9b1bb88 in QObject::disconnectImpl(QObject const*, void**, QObject const*, void**, QMetaObject const*) () at /usr/lib/libQt5Core.so.5
#8  0x00007f1de1affb3d in QQuickMenuPrivate::setParentMenu(QQuickMenu*) () at /usr/lib/libQt5QuickTemplates2.so.5
#9  0x00007f1de1b00f82 in QQuickMenuPrivate::removeItem(int, QQuickItem*) () at /usr/lib/libQt5QuickTemplates2.so.5
#10 0x00007f1deb50c1e7 in QQuickItemPrivate::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&) () at /usr/lib/libQt5Quick.so.5
#11 0x00007f1deb512486 in QQuickItem::setParentItem(QQuickItem*) () at /usr/lib/libQt5Quick.so.5
#12 0x00007f1deb512acd in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#13 0x00007f1deb534c47 in  () at /usr/lib/libQt5Quick.so.5
#14 0x00007f1de9b16ffb in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#15 0x00007f1de9b1ffb5 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#16 0x00007f1dd8628f4f in  () at /usr/lib/qt/qml/QtQuick/Templates.2/libqtquicktemplates2plugin.so
#17 0x00007f1de9b16ffb in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#18 0x00007f1de9b1ffb5 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#19 0x00007f1deb512b9c in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#20 0x00007f1deb534e97 in  () at /usr/lib/libQt5Quick.so.5
#21 0x00007f1de9b16ffb in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#22 0x00007f1de9b1ffb5 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#23 0x00007f1deb512b9c in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#24 0x00007f1deb534b37 in  () at /usr/lib/libQt5Quick.so.5
#25 0x00007f1de9b199b1 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#26 0x00007f1deb51104c in QQuickItem::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#27 0x00007f1dea9dee44 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#28 0x00007f1dea9e66a1 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#29 0x00007f1de9aee769 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#30 0x00007f1de9af1808 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#31 0x00007f1de9b44db4 in  () at /usr/lib/libQt5Core.so.5
#32 0x00007f1de7e373cf in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#33 0x00007f1de7e38f89 in  () at /usr/lib/libglib-2.0.so.0
#34 0x00007f1de7e38fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#35 0x00007f1de9b443a9 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#36 0x00007f1de408c7e2 in  () at /usr/lib/libQt5XcbQpa.so.5
#37 0x00007f1de9aed3fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#38 0x00007f1de9af5706 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#39 0x00005653099b6616 in  ()
#40 0x00007f1de9543223 in __libc_start_main () at /usr/lib/libc.so.6
#41 0x00005653099b6bde in _start ()
[Inferior 1 (process 2558) detached]

Reported using DrKonqi