Application: plasmashell (5.12.7)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-43-generic x86_64
Distribution: Ubuntu 18.04.2 LTS

-- Information about the crash:
- What I was doing when the application crashed:
I was using four workspaces

- Unusual behavior I noticed:
when I'm using multiple workspaces, after I've changed the desktop some times, I can't change the workspace anymore

- Custom settings of the application:
Multiple Desktops (2 rows, 2 columns)

This crash happens frequently

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 0x7f73dc168800 (LWP 1668))]

Thread 10 (Thread 0x7f72f980e700 (LWP 1865)):
#0  0x00007f73d4fce9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5600e61203c4) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x5600e6120370, cond=0x5600e6120398) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x5600e6120398, mutex=0x5600e6120370) at pthread_cond_wait.c:655
#3  0x00007f73d5e485ab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f73d9bcd6a8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f73d9bcdb0a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f73d5e4717d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f73d4fc86db in start_thread (arg=0x7f72f980e700) at pthread_create.c:463
#8  0x00007f73d574288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f72fa50f700 (LWP 1844)):
#0  0x00007f73d4fce9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5600e54fa730) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x5600e54fa6e0, cond=0x5600e54fa708) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x5600e54fa708, mutex=0x5600e54fa6e0) at pthread_cond_wait.c:655
#3  0x00007f73d5e485ab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f73d9bcd6a8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f73d9bcdb0a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f73d5e4717d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f73d4fc86db in start_thread (arg=0x7f72fa50f700) at pthread_create.c:463
#8  0x00007f73d574288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f730271a700 (LWP 1828)):
#0  0x00007f73d5735bf9 in __GI___poll (fds=0x7f72fc003ce0, nfds=1, timeout=3384541) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f73d029e5c9 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f73d029e6dc in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f73d607e9bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f73d6023a1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f73d5e4223a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7302de3747 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f73d5e4717d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f73d4fc86db in start_thread (arg=0x7f730271a700) at pthread_create.c:463
#9  0x00007f73d574288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f731b815700 (LWP 1815)):
#0  0x00007f73d4fce9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5600e2462c30) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x5600e2462be0, cond=0x5600e2462c08) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x5600e2462c08, mutex=0x5600e2462be0) at pthread_cond_wait.c:655
#3  0x00007f73d5e485ab in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f73d9bcd6a8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f73d9bcdb0a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f73d5e4717d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f73d4fc86db in start_thread (arg=0x7f731b815700) at pthread_create.c:463
#8  0x00007f73d574288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f7321795700 (LWP 1812)):
#0  0x00007f73d5735bf9 in __GI___poll (fds=0x7f731c0051c0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f73d029e5c9 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f73d029e6dc in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f73d607e9bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f73d6023a1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f73d5e4223a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f73d9b4e2a6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f73d5e4717d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f73d4fc86db in start_thread (arg=0x7f7321795700) at pthread_create.c:463
#9  0x00007f73d574288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f73b5540700 (LWP 1806)):
#0  0x00007f73d4fce9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f73dbb23fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7f73dbb23f68, cond=0x7f73dbb23f90) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7f73dbb23f90, mutex=0x7f73dbb23f68) at pthread_cond_wait.c:655
#3  0x00007f73db82d5f4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f73db82d639 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f73d4fc86db in start_thread (arg=0x7f73b5540700) at pthread_create.c:463
#6  0x00007f73d574288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f73b7b25700 (LWP 1805)):
#0  0x00007f73d5735bf9 in __GI___poll (fds=0x7f73ac003ce0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f73d029e5c9 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f73d029e6dc in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f73d607e9bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f73d6023a1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f73d5e4223a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f73d8fb46f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f73d5e4717d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f73d4fc86db in start_thread (arg=0x7f73b7b25700) at pthread_create.c:463
#9  0x00007f73d574288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f73bdeda700 (LWP 1711)):
#0  0x00007f73d02e4649 in g_mutex_lock () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f73d029db33 in g_main_context_prepare () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f73d029e4fb in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f73d029e6dc in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f73d607e9bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f73d6023a1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f73d5e4223a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f73d8fb46f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f73d5e4717d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f73d4fc86db in start_thread (arg=0x7f73bdeda700) at pthread_create.c:463
#10 0x00007f73d574288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f73bf91f700 (LWP 1688)):
#0  __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:67
#1  0x00007f73d5735be6 in __GI___poll (fds=0x7f73b8004db0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#2  0x00007f73d029e5c9 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f73d029e6dc in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f73d607e9bb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f73d6023a1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f73d5e4223a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f73d64fbd45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007f73d5e4717d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f73d4fc86db in start_thread (arg=0x7f73bf91f700) at pthread_create.c:463
#10 0x00007f73d574288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f73dc168800 (LWP 1668)):
[KCrash Handler]
#6  0x00007f73d9b6c268 in QQuickAnimatorProxyJob::sceneGraphInitialized() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f73d60551d2 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f73d702d83c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007f73d7035104 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007f73d60259e8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f73d602815d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f73d607f373 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f73d029e417 in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007f73d029e650 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007f73d029e6dc in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f73d607e99f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007f73d6023a1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f73d602cac4 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00005600df389cfa in ?? ()
#20 0x00007f73d5642b97 in __libc_start_main (main=0x5600df389320, argc=1, argv=0x7ffffdb150b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffffdb150a8) at ../csu/libc-start.c:310
#21 0x00005600df38a09a in _start ()

Possible duplicates by query: bug 406919, bug 405965, bug 403223, bug 401319, bug 400845.

Reported using DrKonqi