Application: plasmashell (5.16.5)

Qt Version: 5.12.4
Frameworks Version: 5.62.0
Operating System: Linux 5.3.0-40-generic x86_64
Distribution: Ubuntu 19.10

-- Information about the crash:
- Unusual behavior I noticed:Screen goes Black after startup.  Recent Updates have been installed. Error:
Executable: Plasmashell PID:1,285 Signal:  segmentation fault(11)

The crash can be reproduced every time.

-- 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 0x7f24102d5880 (LWP 1285))]

Thread 13 (Thread 0x7f23d894e700 (LWP 1583)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56292f91c804) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x56292f91c7b0, cond=0x56292f91c7d8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x56292f91c7d8, mutex=0x56292f91c7b0) at pthread_cond_wait.c:638
#3  0x00007f240eb04dbf in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f240eb04eb1 in QWaitCondition::wait(QMutex*, unsigned long) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f24109587b9 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2410958a1a in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f23d9d87700 (LWP 1581)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56292e39a6e0) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x56292e39a690, cond=0x56292e39a6b8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x56292e39a6b8, mutex=0x56292e39a690) at pthread_cond_wait.c:638
#3  0x00007f240eb04dbf in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f240eb04eb1 in QWaitCondition::wait(QMutex*, unsigned long) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f24109587b9 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2410958a1a in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f23d914f700 (LWP 1561)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56292f186e34) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x56292f186de0, cond=0x56292f186e08) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x56292f186e08, mutex=0x56292f186de0) at pthread_cond_wait.c:638
#3  0x00007f240eb04dbf in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f240eb04eb1 in QWaitCondition::wait(QMutex*, unsigned long) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f24109587b9 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2410958a1a in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f23da8c7700 (LWP 1512)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56292ea57db0) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x56292ea57d60, cond=0x56292ea57d88) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x56292ea57d88, mutex=0x56292ea57d60) at pthread_cond_wait.c:638
#3  0x00007f240eb04dbf in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f240eb04eb1 in QWaitCondition::wait(QMutex*, unsigned long) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f24109587b9 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2410958a1a in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f23db7fe700 (LWP 1494)):
#0  0x00007f240d417b10 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f240d41938f in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f240d4199e2 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f240d419b73 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f240ed1d653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f240ecc45cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f240eafda45 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f23dbfff700 (LWP 1493)):
#0  0x00007f240e76dc2f in __GI___poll (fds=0x7f23d40029e0, nfds=1, timeout=3034474) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f240d419a3e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f240d419b73 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f240ed1d653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f240ecc45cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f240eafda45 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f23e0c8301c in KCupsConnection::run() () from /lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f23e3607700 (LWP 1489)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56292e508674) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x56292e508620, cond=0x56292e508648) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x56292e508648, mutex=0x56292e508620) at pthread_cond_wait.c:638
#3  0x00007f240eb04dbf in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f240eb04eb1 in QWaitCondition::wait(QMutex*, unsigned long) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f24109587b9 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2410958a1a in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f23ef4eb700 (LWP 1488)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x56292dee7904) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x56292dee78b0, cond=0x56292dee78d8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x56292dee78d8, mutex=0x56292dee78b0) at pthread_cond_wait.c:638
#3  0x00007f240eb04dbf in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f240eb04eb1 in QWaitCondition::wait(QMutex*, unsigned long) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f24109587b9 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2410958a1a in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f23f6787700 (LWP 1484)):
#0  0x00007f240e76dc2f in __GI___poll (fds=0x7f23f0005160, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f240d419a3e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f240d419b73 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f240ed1d653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f240ecc45cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f240eafda45 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f24108d08aa in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f2403fff700 (LWP 1441)):
#0  0x00007f240e76dc2f in __GI___poll (fds=0x7f23f80025e0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f240d419a3e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f240d419b73 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f240ed1d653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f240ecc45cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f240eafda45 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f24105fb319 in ?? () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f24093f7700 (LWP 1394)):
#0  0x00007f240e76dc2f in __GI___poll (fds=0x7f23fc013bb0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f240d419a3e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f240d419b73 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f240ed1d653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f240ecc45cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f240eafda45 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f240f5e7efa in ?? () from /lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f240a2cf700 (LWP 1304)):
#0  0x00007f240e76dc2f in __GI___poll (fds=0x7f240a2cec28, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f2410d63917 in ?? () from /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f2410d6553a in xcb_wait_for_event () from /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f240aac8288 in ?? () from /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f240eafec92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f240df39669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f240e77a323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f24102d5880 (LWP 1285)):
[KCrash Handler]
#6  0x00007f23e0ca273a in JobModel::updateJob(int, KCupsJob const&) () from /lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f23e0ca47e8 in JobModel::insertJob(int, KCupsJob const&) () from /lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007f23e0ca4ca9 in JobModel::getJobFinished(KCupsRequest*) () from /lib/x86_64-linux-gnu/libkcupslib.so
#9  0x00007f240ecf1e4a in QObject::event(QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f240f872a86 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007f240f87be00 in QApplication::notify(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007f240ecc5a2a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f240ecc86a8 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f240ed1e037 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f240d41984d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f240d419ad0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f240d419b73 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007f240ed1d635 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f240ecc45cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f240eccc336 in QCoreApplication::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x000056292b8a4774 in ?? ()
#22 0x00007f240e67f1e3 in __libc_start_main (main=0x56292b8a3c20, argc=1, argv=0x7ffe261b82c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe261b82b8) at ../csu/libc-start.c:308
#23 0x000056292b8a4bfe in _start ()
[Inferior 1 (process 1285) detached]

Possible duplicates by query: bug 417537, bug 416985, bug 416215, bug 416088, bug 414883.

Reported using DrKonqi