SUMMARY
'coredumpctl' reveals crash after boot, before login.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.25.90
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
Graphics Platform: Wayland

Core was generated by `/usr/lib/xdg-desktop-portal-kde'.
Program terminated with signal SIGABRT, Aborted.
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
Downloading 0.00 MB source file /usr/src/debug/glibc/nptl/pthread_kill.c
44            return INTERNAL_SYSCALL_ERROR_P (ret) ? INTERNAL_SYSCALL_ERRNO (ret) : 0;               
[Current thread is 1 (Thread 0x7fdba01b4a80 (LWP 665))]
(gdb) thread apply al bt

Thread 2 (Thread 0x7fdb9fc9c6c0 (LWP 666)):
#0  0x00007fdba45140bf in __GI___poll (fds=0x7fdb980053e0, nfds=2, timeout=24588) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fdba316fe2f in g_main_context_poll (priority=<optimized out>, n_fds=2, fds=0x7fdb980053e0, timeout=<optimized out>, context=0x7fdb98001cf0) at ../glib/glib/gmain.c:4543
#2  g_main_context_iterate.constprop.0 (context=0x7fdb98001cf0, block=1, dispatch=1, self=<optimized out>) at ../glib/glib/gmain.c:4233
#3  0x00007fdba31180d2 in g_main_context_iteration (context=0x7fdb98001cf0, may_block=1) at ../glib/glib/gmain.c:4303
#4  0x00007fdba4cd750c in QEventDispatcherGlib::processEvents (this=0x7fdb98000b70, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007fdba4c8532c in QEventLoop::exec (this=0x7fdb9fc9bad0, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#6  0x00007fdba4ae749f in QThread::exec (this=this@entry=0x7fdba554e560 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007fdba54f2cba in QDBusConnectionManager::run (this=0x7fdba554e560 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at /usr/src/debug/qtbase/src/dbus/qdbusconnection.cpp:179
#8  0x00007fdba4ae42ba in QThreadPrivate::start (arg=0x7fdba554e560 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:330
#9  0x00007fdba449f8fd in start_thread (arg=<optimized out>) at pthread_create.c:442
#10 0x00007fdba4521a60 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 1 (Thread 0x7fdba01b4a80 (LWP 665)):
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
#1  0x00007fdba44a16b3 in __pthread_kill_internal (signo=6, threadid=<optimized out>) at pthread_kill.c:78
#2  0x00007fdba4451958 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#3  0x00007fdba443b53d in __GI_abort () at abort.c:79
#4  0x00007fdba4a9fede in qt_message_fatal (message=<synthetic pointer>..., context=...) at global/qlogging.cpp:1914
#5  QMessageLogger::fatal (this=this@entry=0x7ffe9851a720, msg=msg@entry=0x7fdba5ba0ac3 "%s") at global/qlogging.cpp:893
#6  0x00007fdba573caa5 in init_platform (argv=<optimized out>, argc=<optimized out>, platformThemeName=..., platformPluginPath=..., pluginNamesWithArguments=...) at kernel/qguiapplication.cpp:1254
#7  QGuiApplicationPrivate::createPlatformIntegration (this=0x55e67cd969f0) at kernel/qguiapplication.cpp:1484
#8  0x00007fdba573d109 in QGuiApplicationPrivate::createEventDispatcher (this=<optimized out>) at kernel/qguiapplication.cpp:1501
#9  0x00007fdba4c921ab in QCoreApplicationPrivate::init (this=this@entry=0x55e67cd969f0) at kernel/qcoreapplication.cpp:835
#10 0x00007fdba573d1b9 in QGuiApplicationPrivate::init (this=this@entry=0x55e67cd969f0) at kernel/qguiapplication.cpp:1530
#11 0x00007fdba6575e0e in QApplicationPrivate::init (this=0x55e67cd969f0) at kernel/qapplication.cpp:513
#12 0x00007fdba6575f34 in QApplication::QApplication (this=<optimized out>, argc=<optimized out>, argv=<optimized out>, _internal=<optimized out>, this=<optimized out>, argc=<optimized out>, argv=<optimized out>, _internal=<optimized out>) at kernel/qapplication.cpp:501
#13 0x000055e67c3ba0c6 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/xdg-desktop-portal-kde-5.25.90/src/xdg-desktop-portal-kde.cpp:25