Application: plasmashell (5.10.5)

Qt Version: 5.9.1
Frameworks Version: 5.38.0
Operating System: Linux 4.13.0-32-generic x86_64
Distribution: Ubuntu 17.10

-- Information about the crash:
I was verifying time settings, and clicked OK to close the Time Settings dialog box. Then the screen went black, and Plasma restarted a moment later.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f2871d4cfc0 (LWP 2249))]

Thread 9 (Thread 0x7f2787fff700 (LWP 3478)):
#0  0x00007f286b37d951 in __GI___poll (fds=0x7f2780002de0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f2865fb0169 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2865fb027c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f286bcbd49b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f286bc62e3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f286ba823ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f286ba8729d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f286ac1d7fc in start_thread (arg=0x7f2787fff700) at pthread_create.c:465
#8  0x00007f286b389b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f27a366d700 (LWP 3042)):
#0  0x00007f2865ff55d4 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f2865fafb69 in g_main_context_check () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2865fb0110 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2865fb027c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f286bcbd49b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f286bc62e3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f286ba823ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f27a5c86717 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007f286ba8729d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f286ac1d7fc in start_thread (arg=0x7f27a366d700) at pthread_create.c:465
#10 0x00007f286b389b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f27b74cc700 (LWP 3031)):
#0  0x00007f286b3981af in __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:67
#1  0x00007f286b37d93e in __GI___poll (fds=0x7f27b00053e0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#2  0x00007f2865fb0169 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2865fb027c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f286bcbd49b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f286bc62e3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f286ba823ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f286f778846 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f286ba8729d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f286ac1d7fc in start_thread (arg=0x7f27b74cc700) at pthread_create.c:465
#10 0x00007f286b389b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f28475aa700 (LWP 2960)):
#0  0x00007f286ac24072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f287171bfb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f286ac24072 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f287171bf68, cond=0x7f287171bf90) at pthread_cond_wait.c:502
#2  0x00007f286ac24072 in __pthread_cond_wait (cond=0x7f287171bf90, mutex=0x7f287171bf68) at pthread_cond_wait.c:655
#3  0x00007f2871427bd4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f2871427c19 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f286ac1d7fc in start_thread (arg=0x7f28475aa700) at pthread_create.c:465
#6  0x00007f286b389b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f2851761700 (LWP 2950)):
#0  0x00007f286b37d951 in __GI___poll (fds=0x7f2840002de0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f2865fb0169 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2865fb027c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f286bcbd49b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f286bc62e3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f286ba823ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f286ebe2f45 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f286ba8729d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f286ac1d7fc in start_thread (arg=0x7f2851761700) at pthread_create.c:465
#9  0x00007f286b389b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f28539d4700 (LWP 2362)):
#0  0x00007f286b37d951 in __GI___poll (fds=0x7f28480029e0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f2865fb0169 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2865fb027c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f286bcbd49b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f286bc62e3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f286ba823ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f286ebe2f45 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f286ba8729d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f286ac1d7fc in start_thread (arg=0x7f28539d4700) at pthread_create.c:465
#9  0x00007f286b389b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f2859425700 (LWP 2272)):
#0  0x00007f286b3981af in __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:67
#1  0x00007f286b37905d in __GI___libc_read (fd=7, buf=0x7f2859424a60, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:26
#2  0x00007f2865ff4280 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2865fafc4b in g_main_context_check () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f2865fb0110 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f2865fb027c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f286bcbd49b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f286bc62e3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f286ba823ca in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f286c139e45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#10 0x00007f286ba8729d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f286ac1d7fc in start_thread (arg=0x7f2859425700) at pthread_create.c:465
#12 0x00007f286b389b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f285b066700 (LWP 2267)):
#0  0x00007f286b37d951 in __GI___poll (fds=0x7f285b065bb8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f287037e747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f287038053a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f285d1adf09 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f286ba8729d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f286ac1d7fc in start_thread (arg=0x7f285b066700) at pthread_create.c:465
#6  0x00007f286b389b5f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f2871d4cfc0 (LWP 2249)):
[KCrash Handler]
#6  0x00007f278cf5db31 in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#7  0x00007f278cf5f16c in Akonadi::Monitor::mimeTypesMonitored() const () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#8  0x00007f278d010485 in Akonadi::EntityTreeModelPrivate::fillModel() () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#9  0x00007f278d011010 in Akonadi::EntityTreeModelPrivate::endResetModel() () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#10 0x00007f278d0075b9 in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#11 0x00007f286bc938e5 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f278cf9515c in  () at /usr/lib/x86_64-linux-gnu/libKF5AkonadiCore.so.5
#13 0x00007f286bc94452 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f286cc6946c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007f286cc70d34 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007f286bc64de8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007f286bc6755d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f286bcbde53 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f2865faffb7 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f2865fb01f0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f2865fb027c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f286bcbd47f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007f286bc62e3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007f286bc6bda4 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x0000561fabc3dcc2 in  ()
#26 0x00007f286b2961c1 in __libc_start_main (main=0x561fabc3d160, argc=1, argv=0x7fffaa737988, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffaa737978) at ../csu/libc-start.c:308
#27 0x0000561fabc3e03a in _start ()

Reported using DrKonqi