Raspberry PI 400, cannot start KDE login session after update, because plasmashell crashloops.
Summary
maj 03 21:37:26 amiga plasmashell[6257]: kf.plasma.quick: Applet preload policy set to 1
maj 03 21:37:28 amiga plasmashell[6257]: Checking screens: available: (QScreen(0xaaaad58e1980, name="HDMI-1")) redundant: QHash() fake: QSet() all: (QScreen(0xaaaad58e1980, name="HDMI-1"))
maj 03 21:37:28 amiga plasmashell[6257]: Trying to use rootObject before initialization is completed, whilst using setInitializationDelayed. Forcing completion
maj 03 21:37:30 amiga plasmashell[6257]: 25 -- exe=/usr/bin/plasmashell
maj 03 21:37:30 amiga plasmashell[6257]: 13 -- platform=xcb
maj 03 21:37:30 amiga plasmashell[6257]: 11 -- display=:0
maj 03 21:37:30 amiga plasmashell[6257]: 20 -- appname=plasmashell
maj 03 21:37:30 amiga plasmashell[6257]: 17 -- apppath=/usr/bin
maj 03 21:37:30 amiga plasmashell[6257]: 10 -- signal=11
maj 03 21:37:30 amiga plasmashell[6257]: 9 -- pid=6257
maj 03 21:37:30 amiga plasmashell[6257]: 18 -- appversion=5.27.4
maj 03 21:37:30 amiga plasmashell[6257]: 19 -- programname=Plasma
maj 03 21:37:30 amiga plasmashell[6257]: 31 -- bugaddress=submit@bugs.kde.org
maj 03 21:37:30 amiga plasmashell[6257]: KCrash: crashing... crashRecursionCounter = 2
maj 03 21:37:30 amiga plasmashell[6257]: KCrash: Application Name = plasmashell path = /usr/bin pid = 6257
maj 03 21:37:30 amiga plasmashell[6257]: KCrash: Arguments: /usr/bin/plasmashell --no-respawn
maj 03 21:37:30 amiga plasmashell[6257]: KCrash: Attempting to start /usr/lib/drkonqi
maj 03 21:37:32 amiga drkonqi[6280]: file:///usr/lib/qt/qml/org/kde/kirigami.2/ContextDrawer.qml:132:9: QML ListView: Binding loop detected for property "topMargin"
maj 03 21:37:32 amiga plasmashell[6257]: Unable to start Dr. Konqi
maj 03 21:37:32 amiga plasmashell[6257]: Re-raising signal for core dump handling.
maj 03 21:37:33 amiga systemd[1]: Started Process Core Dump (PID 6295/UID 0).
░░ Subject: A start job for unit systemd-coredump@17-6295-0.service has finished successfully
░░ Defined-By: systemd
░░ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
░░
░░ A start job for unit systemd-coredump@17-6295-0.service has finished successfully.
░░
░░ The job identifier is 3165.
maj 03 21:37:37 amiga systemd-coredump[6297]: [🡕] Process 6257 (plasmashell) of user 1000 dumped core.
Stack trace of thread 6275:
#0 0x0000ffff9e172790 n/a (libc.so.6 + 0x82790)
#1 0x0000ffff9e12b6fc raise (libc.so.6 + 0x3b6fc)
#2 0x0000ffffa0bd4dd0 _ZN6KCrash19defaultCrashHandlerEi (libKF5Crash.so.5 + 0x4dd0)
#3 0x0000ffffa12da7ac n/a (linux-vdso.so.1 + 0x7ac)
#4 0x0000ffffa12da7ac n/a (linux-vdso.so.1 + 0x7ac)
#5 0x0000ffff9e17277c n/a (libc.so.6 + 0x8277c)
Stack trace of thread 6276:
#0 0x0000ffff9e16d2d8 n/a (libc.so.6 + 0x7d2d8)
#1 0x0000ffff9e170184 pthread_cond_timedwait (libc.so.6 + 0x80184)
#2 0x0000ffff9e5e1708 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xd1708)
#3 0x0000ffff9e5dddbc n/a (libQt5Core.so.5 + 0xcddbc)
#4 0x0000ffff9e5d95d4 n/a (libQt5Core.so.5 + 0xc95d4)
#5 0x0000ffff9e170aec n/a (libc.so.6 + 0x80aec)
#6 0x0000ffff9e1da5dc n/a (libc.so.6 + 0xea5dc)
Stack trace of thread 6266:
#0 0x0000ffff9e16d2d8 n/a (libc.so.6 + 0x7d2d8)
#1 0x0000ffff9e170184 pthread_cond_timedwait (libc.so.6 + 0x80184)
#2 0x0000ffff9e5e1708 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt5Core.so.5 + 0xd1708)
#3 0x0000ffff9e5dddbc n/a (libQt5Core.so.5 + 0xcddbc)
#4 0x0000ffff9e5d95d4 n/a (libQt5Core.so.5 + 0xc95d4)
#5 0x0000ffff9e170aec n/a (libc.so.6 + 0x80aec)
#6 0x0000ffff9e1da5dc n/a (libc.so.6 + 0xea5dc)
Stack trace of thread 6257:
#0 0x0000ffff9e1d04d8 __poll (libc.so.6 + 0xe04d8)
#1 0x0000ffffa0bd416c n/a (libKF5Crash.so.5 + 0x416c)
#2 0x0000ffffa0bd4d2c _ZN6KCrash19defaultCrashHandlerEi (libKF5Crash.so.5 + 0x4d2c)
#3 0x0000ffffa12da7ac n/a (linux-vdso.so.1 + 0x7ac)
#4 0x0000ffffa12da7ac n/a (linux-vdso.so.1 + 0x7ac)
#5 0x0000ffff9ff20f04 _ZN3QV413MemoryManager12collectRootsEPNS_9MarkStackE (libQt5Qml.so.5 + 0xb0f04)
#6 0x0000fffff033aac8 n/a (n/a + 0x0)
#7 0x0000fffff033aac8 n/a (n/a + 0x0)
ELF object binary architecture: AARCH64
░░ Subject: Process 6257 (plasmashell) dumped core
Update: So this trouble had me check back if Wayland was available for RasPi yet, and apparently it is.
Plasmashell did not crashloop when I tried plasma-wayland-session instead of traditional X11.