Application: plasmashell (5.16.5)
 (Compiled from sources)
Qt Version: 5.12.4
Frameworks Version: 5.62.0
Operating System: Linux 5.3.0-62-generic x86_64
Distribution: Ubuntu 19.10

-- Information about the crash:
- Unusual behavior I noticed:
Plasmashell crash after turning on and login

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 0x7f8bb84af880 (LWP 20551))]

Thread 8 (Thread 0x7f8b8f7fe700 (LWP 20563)):
#0  0x00007f8bbbd58120 in QMutex::lock() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f8bbbf76542 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f8bba6f302f in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8bba6f39db in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f8bba6f3be3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f8bbbf76653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8bbbf1d5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f8bbbd56a45 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8bbbd57c92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f8bbb1da669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#10 0x00007f8bbb9dc2b3 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f8b8ffff700 (LWP 20562)):
#0  0x00007f8bbb9cfbbf in __GI___poll (fds=0x7f8b880025e0, nfds=1, timeout=2527478) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f8bba6f3aae in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8bba6f3be3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8bbbf76653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f8bbbf1d5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8bbbd56a45 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8b98f3001c in KCupsConnection::run() () from /lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f8bbbd57c92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8bbb1da669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f8bbb9dc2b3 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f8ba1c8b700 (LWP 20558)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55933acf0d60) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55933acf0d10, cond=0x55933acf0d38) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55933acf0d38, mutex=0x55933acf0d10) at pthread_cond_wait.c:638
#3  0x00007f8bbbd5ddbf in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f8bbbd5deb1 in QWaitCondition::wait(QMutex*, unsigned long) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8bbdb767b9 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f8bbdb76a1a in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f8bbbd57c92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8bbb1da669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f8bbb9dc2b3 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f8ba2df2700 (LWP 20555)):
#0  0x00007f8bba73fc3d in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f8bba6f3a71 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8bba6f3be3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8bbbf76653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f8bbbf1d5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8bbbd56a45 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8bbdaee8aa in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f8bbbd57c92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8bbb1da669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f8bbb9dc2b3 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f8bb55e2700 (LWP 20554)):
#0  0x00007f8bba73fc3d in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f8bba6f3a94 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8bba6f3be3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8bbbf76653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f8bbbf1d5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8bbbd56a45 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8bbd819319 in ?? () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f8bbbd57c92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8bbb1da669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f8bbb9dc2b3 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f8bb6826700 (LWP 20553)):
#0  0x00007f8bbbf76363 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f8bba6f302f in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8bba6f39db in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8bba6f3be3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f8bbbf76653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8bbbf1d5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8bbbd56a45 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f8bbc83befa in ?? () from /lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007f8bbbd57c92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f8bbb1da669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#10 0x00007f8bbb9dc2b3 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f8bb7649700 (LWP 20552)):
#0  0x00007f8bbb9cfbbf in __GI___poll (fds=0x7f8bb7648c28, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f8bbdf6d917 in ?? () from /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f8bbdf6f53a in xcb_wait_for_event () from /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f8bb7e01288 in ?? () from /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f8bbbd57c92 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8bbb1da669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f8bbb9dc2b3 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f8bb84af880 (LWP 20551)):
[KCrash Handler]
#6  0x00007f8b98f4f73a in JobModel::updateJob(int, KCupsJob const&) () from /lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f8b98f517e8 in JobModel::insertJob(int, KCupsJob const&) () from /lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007f8b98f51ca9 in JobModel::getJobFinished(KCupsRequest*) () from /lib/x86_64-linux-gnu/libkcupslib.so
#9  0x00007f8bbbf4ae4a in QObject::event(QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f8bbcabaa86 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007f8bbcac3e00 in QApplication::notify(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007f8bbbf1ea2a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f8bbbf216a8 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f8bbbf77037 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f8bba6f38bd in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f8bba6f3b40 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f8bba6f3be3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007f8bbbf76635 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f8bbbf1d5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f8bbbf25336 in QCoreApplication::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x000055933a1d5774 in ?? ()
#22 0x00007f8bbb8e11e3 in __libc_start_main (main=0x55933a1d4c20, argc=1, argv=0x7ffcec32b018, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffcec32b008) at ../csu/libc-start.c:308
#23 0x000055933a1d5bfe in _start ()
[Inferior 1 (process 20551) detached]

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

Reported using DrKonqi