Application: plasmashell (5.20.3)

Qt Version: 5.15.1
Frameworks Version: 5.75.0
Operating System: Linux 5.4.0-54-generic x86_64
Windowing system: X11
Distribution: KDE neon User Edition 5.20

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

After upgrading the other day my taskbar disappeared. I had to remove Event Calendar to get my taskbar back; before removing I had edited ~/.config/plasma-org.kde.plasma.desktop-appletsrc to find the applet that was causing the problem.

I've installed 2 security updates this morning and rebooted and it is still crashing on login. There are no other updates available at this time.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault

[New LWP 1709]
[New LWP 1716]
[New LWP 1987]
[New LWP 1988]
[New LWP 1989]
[New LWP 1990]
[New LWP 1991]
[New LWP 1992]
[New LWP 2024]
[New LWP 2027]
[New LWP 2047]
[New LWP 2048]
[New LWP 2050]
[New LWP 2063]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f31b628aaff in __GI___poll (fds=0x7ffcece92528, nfds=1, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29
[Current thread is 1 (Thread 0x7f31b2736d00 (LWP 1698))]

Thread 15 (Thread 0x7f3143fff700 (LWP 2063)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556bf9e21c34) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x556bf9e21be0, cond=0x556bf9e21c08) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x556bf9e21c08, mutex=0x556bf9e21be0) at pthread_cond_wait.c:638
#3  0x00007f31b661dceb in QWaitConditionPrivate::wait (deadline=..., this=0x556bf9e21be0) at thread/qwaitcondition_unix.cpp:146
#4  QWaitCondition::wait (this=<optimized out>, mutex=0x556bf9cf7260, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f31b83ae774 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f31b83aebe9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f31b6617b1c in QThreadPrivate::start (arg=0x556bf9cf71c0) at thread/qthread_unix.cpp:329
#8  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7f3179335700 (LWP 2050)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556bf8e26dd0) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x556bf8e26d80, cond=0x556bf8e26da8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x556bf8e26da8, mutex=0x556bf8e26d80) at pthread_cond_wait.c:638
#3  0x00007f31b661dceb in QWaitConditionPrivate::wait (deadline=..., this=0x556bf8e26d80) at thread/qwaitcondition_unix.cpp:146
#4  QWaitCondition::wait (this=<optimized out>, mutex=0x7f31ac00c5d0, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f31b83ae774 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f31b83aebe9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f31b6617b1c in QThreadPrivate::start (arg=0x7f31ac00c530) at thread/qthread_unix.cpp:329
#8  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f317b381700 (LWP 2048)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556bf7e87960) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x556bf7e87910, cond=0x556bf7e87938) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x556bf7e87938, mutex=0x556bf7e87910) at pthread_cond_wait.c:638
#3  0x00007f31b661dceb in QWaitConditionPrivate::wait (deadline=..., this=0x556bf7e87910) at thread/qwaitcondition_unix.cpp:146
#4  QWaitCondition::wait (this=<optimized out>, mutex=0x7f31ac00c0d0, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f31b83ae774 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f31b83aebe9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f31b6617b1c in QThreadPrivate::start (arg=0x7f31ac00c030) at thread/qthread_unix.cpp:329
#8  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f317bfff700 (LWP 2047)):
#0  0x00007f31b628aaff in __GI___poll (fds=0x7f3164000b60, nfds=1, timeout=3388461) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f31b4bc91ae in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f31b4bc92e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f31b685624b in QEventDispatcherGlib::processEvents (this=0x7f3164004f00, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f31b67fa43b in QEventLoop::exec (this=this@entry=0x7f317bffece0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#5  0x00007f31b6616982 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x00007f318095207c in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f31b6617b1c in QThreadPrivate::start (arg=0x556bf8871160) at thread/qthread_unix.cpp:329
#8  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f31787bd700 (LWP 2027)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556bf7d210b4) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x556bf7d21060, cond=0x556bf7d21088) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x556bf7d21088, mutex=0x556bf7d21060) at pthread_cond_wait.c:638
#3  0x00007f31b661dceb in QWaitConditionPrivate::wait (deadline=..., this=0x556bf7d21060) at thread/qwaitcondition_unix.cpp:146
#4  QWaitCondition::wait (this=<optimized out>, mutex=0x7f31ac006810, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f31b83ae774 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f31b83aebe9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f31b6617b1c in QThreadPrivate::start (arg=0x7f31ac006770) at thread/qthread_unix.cpp:329
#8  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f3183a10700 (LWP 2024)):
#0  0x00007f31b628aaff in __GI___poll (fds=0x7f317c005890, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f31b4bc91ae in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f31b4bc92e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f31b685624b in QEventDispatcherGlib::processEvents (this=0x7f317c00f1f0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f31b67fa43b in QEventLoop::exec (this=this@entry=0x7f3183a0fce0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#5  0x00007f31b6616982 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x00007f31b82e935a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f31b6617b1c in QThreadPrivate::start (arg=0x556bf738eb90) at thread/qthread_unix.cpp:329
#8  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f319a168700 (LWP 1992)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556bf77feb18) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x556bf77feac8, cond=0x556bf77feaf0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x556bf77feaf0, mutex=0x556bf77feac8) at pthread_cond_wait.c:638
#3  0x00007f31a90cf62b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007f31a90cf23b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f319a969700 (LWP 1991)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556bf77feb18) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x556bf77feac8, cond=0x556bf77feaf0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x556bf77feaf0, mutex=0x556bf77feac8) at pthread_cond_wait.c:638
#3  0x00007f31a90cf62b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007f31a90cf23b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f319b16a700 (LWP 1990)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556bf77feb18) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x556bf77feac8, cond=0x556bf77feaf0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x556bf77feaf0, mutex=0x556bf77feac8) at pthread_cond_wait.c:638
#3  0x00007f31a90cf62b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007f31a90cf23b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f319b96b700 (LWP 1989)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556bf77feb18) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x556bf77feac8, cond=0x556bf77feaf0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x556bf77feaf0, mutex=0x556bf77feac8) at pthread_cond_wait.c:638
#3  0x00007f31a90cf62b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007f31a90cf23b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f31a8b3a700 (LWP 1988)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x556bf77fdf38) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x556bf77fdee8, cond=0x556bf77fdf10) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x556bf77fdf10, mutex=0x556bf77fdee8) at pthread_cond_wait.c:638
#3  0x00007f31a90cf62b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007f31a90cf23b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f31ab5ef700 (LWP 1987)):
#0  __GI___libc_read (nbytes=16, buf=0x7f31ab5eeaf0, fd=10) at ../sysdeps/unix/sysv/linux/read.c:26
#1  __GI___libc_read (fd=10, buf=0x7f31ab5eeaf0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f31b4c1189f in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f31b4bc8cfe in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f31b4bc9152 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f31b4bc92e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f31b685624b in QEventDispatcherGlib::processEvents (this=0x7f31a0000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#7  0x00007f31b67fa43b in QEventLoop::exec (this=this@entry=0x7f31ab5eed00, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#8  0x00007f31b6616982 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#9  0x00007f31b7ee3d69 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f31b6617b1c in QThreadPrivate::start (arg=0x556bf757bd50) at thread/qthread_unix.cpp:329
#11 0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f31b0c99700 (LWP 1716)):
#0  __GI___libc_read (nbytes=16, buf=0x7f31b0c98ae0, fd=6) at ../sysdeps/unix/sysv/linux/read.c:26
#1  __GI___libc_read (fd=6, buf=0x7f31b0c98ae0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f31b4c1189f in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f31b4bc8cfe in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f31b4bc9152 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f31b4bc92e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f31b685624b in QEventDispatcherGlib::processEvents (this=0x7f31a4000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#7  0x00007f31b67fa43b in QEventLoop::exec (this=this@entry=0x7f31b0c98cf0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#8  0x00007f31b6616982 in QThread::exec (this=this@entry=0x7f31b71ffd80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#9  0x00007f31b717bf4b in QDBusConnectionManager::run (this=0x7f31b71ffd80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:179
#10 0x00007f31b6617b1c in QThreadPrivate::start (arg=0x7f31b71ffd80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:329
#11 0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f31b1ac8700 (LWP 1709)):
#0  0x00007f31b628aaff in __GI___poll (fds=0x7f31b1ac7c28, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f31b8869c1a in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f31b886b90a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f31b209cb08 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f31b6617b1c in QThreadPrivate::start (arg=0x556bf72802b0) at thread/qthread_unix.cpp:329
#5  0x00007f31b5689609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f31b6297293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f31b2736d00 (LWP 1698)):
[KCrash Handler]
#4  0x0000000000000030 in ?? ()
#5  0x00007f318169a007 in DaysModel::update (this=0x556bf932a920) at ./src/declarativeimports/calendar/daysmodel.cpp:90
#6  DaysModel::update (this=0x556bf932a920) at ./src/declarativeimports/calendar/daysmodel.cpp:77
#7  0x00007f31816949c5 in DaysModel::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=0x556bf8a66698, _c=<optimized out>) at ./obj-x86_64-linux-gnu/src/declarativeimports/calendar/calendarplugin_autogen/EWIEGA46WW/moc_daysmodel.cpp:113
#8  0x00007f31b68294c9 in QObject::event (this=0x556bf932a920, e=0x556bf8a66650) at kernel/qobject.cpp:1314
#9  0x00007f31b74efda3 in QApplicationPrivate::notify_helper (this=this@entry=0x556bf727d0a0, receiver=receiver@entry=0x556bf932a920, e=e@entry=0x556bf8a66650) at kernel/qapplication.cpp:3630
#10 0x00007f31b74f8b98 in QApplication::notify (this=0x7ffcece933e0, receiver=0x556bf932a920, e=0x556bf8a66650) at kernel/qapplication.cpp:3154
#11 0x00007f31b67fb92a in QCoreApplication::notifyInternal2 (receiver=0x556bf932a920, event=0x556bf8a66650) at ../../include/QtCore/5.15.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:325
#12 0x00007f31b67fe231 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x556bf72721a0) at kernel/qcoreapplication.cpp:1817
#13 0x00007f31b6856bd7 in postEventSourceDispatch (s=0x556bf73a1020) at kernel/qeventdispatcher_glib.cpp:277
#14 0x00007f31b4bc8fbd in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007f31b4bc9240 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f31b4bc92e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f31b6856232 in QEventDispatcherGlib::processEvents (this=0x556bf73b1910, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#18 0x00007f31b67fa43b in QEventLoop::exec (this=this@entry=0x7ffcece93290, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#19 0x00007f31b68025e4 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#20 0x0000556bf6429c62 in main (argc=<optimized out>, argv=<optimized out>) at ./shell/main.cpp:244
[Inferior 1 (process 1698) detached]

The reporter indicates this bug may be a duplicate of or related to bug 429240.

Possible duplicates by query: bug 429240, bug 429206, bug 428986, bug 428691, bug 428678.

Reported using DrKonqi