Bug 458197

Application: plasmashell (5.25.4)

Qt Version: 5.15.5
Frameworks Version: 5.96.0
Operating System: Linux 5.15.0-46-generic x86_64
Windowing System: X11
Distribution: KDE neon User - 5.25
DrKonqi: 5.25.4 [KCrashBackend]

-- Information about the crash:
Plasma crashes immediately after I login. I am presented with a black screen. Plasma crashes again everytime I restart it with "kstart plasmashell". The crash is reproduced every time I login and every time I restart plasmashell. The first crash happened when I tried to use the present windows effect; the desktop froze, I rebooted the laptop and plasma now crashes every time.

I can open applications with KRunner and desktop effects such as present windows still work. I have no panels and no wallpaper.

Plamsa style: Breeze Dark
Application style: Breeze

The crash can be reproduced every time.

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

[New LWP 4612]
[New LWP 4613]
[New LWP 4614]
[New LWP 4615]
[New LWP 4617]
[New LWP 4618]
[New LWP 4619]
[New LWP 4620]
[New LWP 4621]
[New LWP 4626]
[New LWP 4627]
[New LWP 4649]
[New LWP 4650]
[New LWP 4651]
[New LWP 4652]
[New LWP 4653]
[New LWP 4654]
[New LWP 4655]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f2ced92f99f in __GI___poll (fds=0x7ffdacaacf38, nfds=1, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29
__preamble__
[Current thread is 1 (Thread 0x7f2ce9a589c0 (LWP 4611))]

Thread 19 (Thread 0x7f2c4f7fe700 (LWP 4655)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bd04190310) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bd041902c0, cond=0x55bd041902e8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bd041902e8, mutex=0x55bd041902c0) at pthread_cond_wait.c:647
#3  0x00007f2cedcc55fb in QWaitConditionPrivate::wait (deadline=..., this=0x55bd041902c0) at thread/qwaitcondition_unix.cpp:146
#4  QWaitCondition::wait (this=<optimized out>, mutex=0x55bd041e5920, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f2cef95f2f4 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2cef95f769 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x55bd041e5880) at thread/qthread_unix.cpp:331
#8  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7f2c4ffff700 (LWP 4654)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bd041f9fe0) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bd041f9f90, cond=0x55bd041f9fb8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bd041f9fb8, mutex=0x55bd041f9f90) at pthread_cond_wait.c:647
#3  0x00007f2cda63a5eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2cda63a1eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7f2c5ddfe700 (LWP 4653)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bd03f0eac0) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bd03f0ea70, cond=0x55bd03f0ea98) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bd03f0ea98, mutex=0x55bd03f0ea70) at pthread_cond_wait.c:647
#3  0x00007f2cedcc55fb in QWaitConditionPrivate::wait (deadline=..., this=0x55bd03f0ea70) at thread/qwaitcondition_unix.cpp:146
#4  QWaitCondition::wait (this=<optimized out>, mutex=0x55bd03f1ecb0, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f2cef95f2f4 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2cef95f769 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x55bd03f1ec10) at thread/qthread_unix.cpp:331
#8  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7f2c5e5ff700 (LWP 4652)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bd0404a890) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bd0404a840, cond=0x55bd0404a868) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bd0404a868, mutex=0x55bd0404a840) at pthread_cond_wait.c:647
#3  0x00007f2cda63a5eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2cda63a1eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7f2c78845700 (LWP 4651)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bd0242b940) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bd0242b8f0, cond=0x55bd0242b918) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bd0242b918, mutex=0x55bd0242b8f0) at pthread_cond_wait.c:647
#3  0x00007f2cedcc55fb in QWaitConditionPrivate::wait (deadline=..., this=0x55bd0242b8f0) at thread/qwaitcondition_unix.cpp:146
#4  QWaitCondition::wait (this=<optimized out>, mutex=0x55bd010fbe60, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f2cef95f2f4 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2cef95f769 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x55bd010fbdc0) at thread/qthread_unix.cpp:331
#8  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7f2c7908f700 (LWP 4650)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bd03d02bb4) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bd03d02b60, cond=0x55bd03d02b88) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bd03d02b88, mutex=0x55bd03d02b60) at pthread_cond_wait.c:647
#3  0x00007f2cda63a5eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2cda63a1eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f2cab5e5700 (LWP 4649)):
#0  0x00007f2cec1bbb3f in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f2cec1bc2e8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2cec1bc4a3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2cedf005bb in QEventDispatcherGlib::processEvents (this=0x7f2c68000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f2cedea476b in QEventLoop::exec (this=this@entry=0x7f2cab5e4ba0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#5  0x00007f2cedcbe372 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x00007f2c901b207c in KCupsConnection::run() () from /lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x55bd01a3d7e0) at thread/qthread_unix.cpp:331
#8  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f2ca9f93700 (LWP 4627)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bcffb2bf24) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bcffb2bed0, cond=0x55bcffb2bef8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bcffb2bef8, mutex=0x55bcffb2bed0) at pthread_cond_wait.c:647
#3  0x00007f2cedcc55fb in QWaitConditionPrivate::wait (deadline=..., this=0x55bcffb2bed0) at thread/qwaitcondition_unix.cpp:146
#4  QWaitCondition::wait (this=<optimized out>, mutex=0x7f2cdc005940, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f2cef95f2f4 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2cef95f769 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x7f2cdc0058a0) at thread/qthread_unix.cpp:331
#8  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f2caa794700 (LWP 4626)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bd000cd3b0) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bd000cd360, cond=0x55bd000cd388) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bd000cd388, mutex=0x55bd000cd360) at pthread_cond_wait.c:647
#3  0x00007f2cda63a5eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2cda63a1eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f2cbcdff700 (LWP 4621)):
#0  0x00007f2ced92f99f in __GI___poll (fds=0x7f2cac01ab20, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f2cec1bc36e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2cec1bc4a3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2cedf005bb in QEventDispatcherGlib::processEvents (this=0x7f2cac000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f2cedea476b in QEventLoop::exec (this=this@entry=0x7f2cbcdfeba0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#5  0x00007f2cedcbe372 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x00007f2cef89963a in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x7f2cdc0244e0) at thread/qthread_unix.cpp:331
#8  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f2cccc50700 (LWP 4620)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bcffd68250) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bcffd68200, cond=0x55bcffd68228) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bcffd68228, mutex=0x55bcffd68200) at pthread_cond_wait.c:647
#3  0x00007f2cedcc55fb in QWaitConditionPrivate::wait (deadline=..., this=0x55bcffd68200) at thread/qwaitcondition_unix.cpp:146
#4  QWaitCondition::wait (this=<optimized out>, mutex=0x55bcfff4adf0, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f2cef95f2f4 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2cef95f769 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x55bcfff4ad50) at thread/qthread_unix.cpp:331
#8  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f2ccd472700 (LWP 4619)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bcfff786d0) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bcfff78680, cond=0x55bcfff786a8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bcfff786a8, mutex=0x55bcfff78680) at pthread_cond_wait.c:647
#3  0x00007f2cda63a5eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2cda63a1eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f2cce849700 (LWP 4618)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bcffbeb470) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bcffbeb420, cond=0x55bcffbeb448) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bcffbeb448, mutex=0x55bcffbeb420) at pthread_cond_wait.c:647
#3  0x00007f2cedcc55fb in QWaitConditionPrivate::wait (deadline=..., this=0x55bcffbeb420) at thread/qwaitcondition_unix.cpp:146
#4  QWaitCondition::wait (this=<optimized out>, mutex=0x55bcffbeb390, deadline=...) at thread/qwaitcondition_unix.cpp:225
#5  0x00007f2cef95f2f4 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f2cef95f769 in ?? () from /lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x55bcffbeb2f0) at thread/qthread_unix.cpp:331
#8  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f2ce0c95700 (LWP 4617)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bcffeaee00) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bcffeaedb0, cond=0x55bcffeaedd8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bcffeaedd8, mutex=0x55bcffeaedb0) at pthread_cond_wait.c:647
#3  0x00007f2cda63a5eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2cda63a1eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f2ce14c6700 (LWP 4615)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bcff30f6b8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bcff30f668, cond=0x55bcff30f690) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55bcff30f690, mutex=0x55bcff30f668) at pthread_cond_wait.c:647
#3  0x00007f2cda63a5eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2cda63a1eb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f2ce2dee700 (LWP 4614)):
#0  0x00007ffdacaeda75 in clock_gettime ()
#1  0x00007f2ced8fa0b5 in __GI___clock_gettime (clock_id=clock_id@entry=1, tp=tp@entry=0x7f2ce2ded930) at ../sysdeps/unix/sysv/linux/clock_gettime.c:38
#2  0x00007f2cedeffe85 in qt_clock_gettime (ts=0x7f2ce2ded930, clock=1) at kernel/qelapsedtimer_unix.cpp:175
#3  do_gettime (frac=<synthetic pointer>, sec=<synthetic pointer>) at kernel/qelapsedtimer_unix.cpp:166
#4  qt_gettime () at kernel/qelapsedtimer_unix.cpp:175
#5  0x00007f2cedefe71d in QTimerInfoList::updateCurrentTime (this=this@entry=0x7f2cd4004950) at kernel/qtimerinfo_unix.cpp:91
#6  0x00007f2cedefecf9 in QTimerInfoList::timerWait (this=0x7f2cd4004950, tm=...) at kernel/qtimerinfo_unix.cpp:388
#7  0x00007f2cedf00316 in timerSourcePrepareHelper (timeout=0x7f2ce2ded9f4, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:162
#8  timerSourcePrepare (source=<optimized out>, timeout=0x7f2ce2ded9f4) at kernel/qeventdispatcher_glib.cpp:166
#9  0x00007f2cec1bb8ef in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f2cec1bc29b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f2cec1bc4a3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007f2cedf005bb in QEventDispatcherGlib::processEvents (this=0x7f2cd4000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#13 0x00007f2cedea476b in QEventLoop::exec (this=this@entry=0x7f2ce2dedbc0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#14 0x00007f2cedcbe372 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#15 0x00007f2cef4fb1b9 in ?? () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#16 0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x55bcff12e370) at thread/qthread_unix.cpp:331
#17 0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#18 0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f2ce3fff700 (LWP 4613)):
#0  __GI___libc_read (nbytes=16, buf=0x7f2ce3ffe9a0, fd=7) at ../sysdeps/unix/sysv/linux/read.c:26
#1  __GI___libc_read (fd=7, buf=0x7f2ce3ffe9a0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f2cec204b2f in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2cec1bbebe in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f2cec1bc312 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f2cec1bc4a3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f2cedf005bb in QEventDispatcherGlib::processEvents (this=0x7f2cdc000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#7  0x00007f2cedea476b in QEventLoop::exec (this=this@entry=0x7f2ce3ffebb0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#8  0x00007f2cedcbe372 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#9  0x00007f2cee83ef4b in ?? () from /lib/x86_64-linux-gnu/libQt5DBus.so.5
#10 0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x7f2cee8c2d80) at thread/qthread_unix.cpp:331
#11 0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f2ce8f00700 (LWP 4612)):
#0  0x00007f2ced92f99f in __GI___poll (fds=0x7f2ce8effae8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f2cf0081c1a in ?? () from /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f2cf008390a in xcb_wait_for_event () from /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f2ce96263c8 in ?? () from /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f2cedcbf553 in QThreadPrivate::start (arg=0x55bcfed5c610) at thread/qthread_unix.cpp:331
#5  0x00007f2ced652609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f2ced93c133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f2ce9a589c0 (LWP 4611)):
[KCrash Handler]
#4  0x000055bd021f1990 in ?? ()
#5  0x00007f2ca841650f in DaysModel::update (this=0x55bd054e0480) at ./src/declarativeimports/calendar/daysmodel.cpp:131
#6  DaysModel::update (this=0x55bd054e0480) at ./src/declarativeimports/calendar/daysmodel.cpp:113
#7  0x00007f2ca8410be5 in DaysModel::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=0x55bd048cba48, _c=<optimized out>) at ./obj-x86_64-linux-gnu/src/declarativeimports/calendar/calendarplugin_autogen/EWIEGA46WW/moc_daysmodel.cpp:113
#8  0x00007f2ceded3849 in QObject::event (this=0x55bd054e0480, e=0x55bd048cba00) at kernel/qobject.cpp:1314
#9  0x00007f2ceebd7e83 in QApplicationPrivate::notify_helper (this=this@entry=0x55bcfed58770, receiver=receiver@entry=0x55bd054e0480, e=e@entry=0x55bd048cba00) at kernel/qapplication.cpp:3637
#10 0x00007f2ceebe0c98 in QApplication::notify (this=0x7ffdacaaea70, receiver=0x55bd054e0480, e=0x55bd048cba00) at kernel/qapplication.cpp:3161
#11 0x00007f2cedea5c6a in QCoreApplication::notifyInternal2 (receiver=0x55bd054e0480, event=0x55bd048cba00) at ../../include/QtCore/5.15.5/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:332
#12 0x00007f2cedea8571 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x55bcfed31ef0) at kernel/qcoreapplication.cpp:1821
#13 0x00007f2cedf00f47 in postEventSourceDispatch (s=0x55bcfeee3520) at kernel/qeventdispatcher_glib.cpp:277
#14 0x00007f2cec1bc17d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007f2cec1bc400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f2cec1bc4a3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f2cedf005a2 in QEventDispatcherGlib::processEvents (this=0x55bcfeee89c0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#18 0x00007f2cedea476b in QEventLoop::exec (this=this@entry=0x7ffdacaae950, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#19 0x00007f2cedeac914 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#20 0x000055bcfd66f577 in main (argc=<optimized out>, argv=<optimized out>) at ./shell/main.cpp:243
[Inferior 1 (process 4611) detached]

The reporter indicates this bug may be a duplicate of or related to bug 454666.

Reported using DrKonqi