SUMMARY
did nothing, kdeinit5 crashed out of the blue.

Operating System: openSUSE Tumbleweed 20200411
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.68.0
Qt Version: 5.14.1
Kernel Version: 5.6.2-1-default
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-6300U CPU @ 2.40GHz
Memory: 15,5 GiB of RAM

backtrace:
Application: kdeinit5 (kdeinit5), signal: Aborted
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f34fd283580 (LWP 6804))]

Thread 3 (Thread 0x7f34f92f6700 (LWP 6808)):
#0  0x00007f34ffa84acf in poll () from /lib64/libc.so.6
#1  0x00007f34fd70733e in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f34fd70745f in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f34fee41c0b in QEventDispatcherGlib::processEvents (this=0x7f34f0000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f34fede9b9b in QEventLoop::exec (this=this@entry=0x7f34f92f5da0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#5  0x00007f34fec145ce in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#6  0x00007f34fec15698 in QThreadPrivate::start (arg=0x55eec0c27740) at thread/qthread_unix.cpp:342
#7  0x00007f34fe1fcefa in start_thread () from /lib64/libpthread.so.0
#8  0x00007f34ffa8f3bf in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f34f9af7700 (LWP 6806)):
#0  0x00007f34ffa84acf in poll () from /lib64/libc.so.6
#1  0x00007f34fd70733e in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f34fd70745f in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f34fee41c0b in QEventDispatcherGlib::processEvents (this=0x7f34ec000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f34fede9b9b in QEventLoop::exec (this=this@entry=0x7f34f9af6d70, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#5  0x00007f34fec145ce in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#6  0x00007f34fb266507 in ?? () from /usr/lib64/libQt5DBus.so.5
#7  0x00007f34fec15698 in QThreadPrivate::start (arg=0x7f34fb2e8da0) at thread/qthread_unix.cpp:342
#8  0x00007f34fe1fcefa in start_thread () from /lib64/libpthread.so.0
#9  0x00007f34ffa8f3bf in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f34fd283580 (LWP 6804)):
[KCrash Handler]
#6  0x00007f34ff9cbea1 in raise () from /lib64/libc.so.6
#7  0x00007f34ff9b553d in abort () from /lib64/libc.so.6
#8  0x00007f34febdcaef in qt_message_fatal (context=..., message=<synthetic pointer>...) at global/qlogging.cpp:1894
#9  QMessageLogger::fatal (this=this@entry=0x7ffce2accdd0, msg=msg@entry=0x7f34fb73c880 "Fatal Error: Got cmd %d, while waiting for an answer!") at global/qlogging.cpp:893
#10 0x00007f34fb669f1c in KIO::SlaveBase::waitForAnswer (this=0x7ffce2acd570, expected1=100, expected2=0, data=..., pCmd=0x0) at /usr/include/qt5/QtCore/qlogging.h:90
#11 0x00007f34fa4df96f in HTTPProtocol::sendBody (this=0x7ffce2acd560) at /usr/src/debug/kio-5.68.0-1.1.x86_64/src/ioslaves/http/http.cpp:3934
#12 0x00007f34fa4fc7a6 in HTTPProtocol::sendBody (this=0x7ffce2acd560) at /usr/src/debug/kio-5.68.0-1.1.x86_64/src/ioslaves/http/http.cpp:3885
#13 HTTPProtocol::sendQuery (this=<optimized out>) at /usr/src/debug/kio-5.68.0-1.1.x86_64/src/ioslaves/http/http.cpp:2672
#14 0x00007f34fa500dbd in HTTPProtocol::proceedUntilResponseHeader (this=this@entry=0x7ffce2acd560) at /usr/src/debug/kio-5.68.0-1.1.x86_64/src/ioslaves/http/http.cpp:655
#15 0x00007f34fa5010cf in HTTPProtocol::proceedUntilResponseContent (this=0x7ffce2acd560, dataInternal=false) at /usr/src/debug/kio-5.68.0-1.1.x86_64/src/ioslaves/http/http.cpp:624
#16 0x00007f34fa4f5996 in HTTPProtocol::davGeneric (size=<optimized out>, method=<optimized out>, url=..., this=<optimized out>) at /usr/src/debug/kio-5.68.0-1.1.x86_64/src/ioslaves/http/http.cpp:917
#17 HTTPProtocol::special (this=0x7ffce2acd560, data=...) at /usr/src/debug/kio-5.68.0-1.1.x86_64/src/ioslaves/http/http.cpp:4108
#18 0x00007f34fb6ea032 in KIO::SlaveBase::dispatch (this=0x7ffce2acd570, command=77, data=...) at /usr/src/debug/kio-5.68.0-1.1.x86_64/src/core/slavebase.cpp:1331
#19 0x00007f34fb6f1596 in KIO::SlaveBase::dispatchLoop (this=this@entry=0x7ffce2acd570) at /usr/src/debug/kio-5.68.0-1.1.x86_64/src/core/slavebase.cpp:338
#20 0x00007f34fa505aa6 in kdemain (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kio-5.68.0-1.1.x86_64/src/ioslaves/http/http.cpp:115
#21 0x000055eebf7c8bcb in ?? ()
#22 0x000055eebf7c9df8 in ?? ()
#23 0x000055eebf7ca7d4 in ?? ()
#24 0x000055eebf7c564d in ?? ()
#25 0x00007f34ff9b6ceb in __libc_start_main () from /lib64/libc.so.6
#26 0x000055eebf7c618a in ?? ()
[Inferior 1 (process 6804) detached]