constantly running machine. via remote ssh. did some maintenance. applied some
updates via zypper ref and zypper up

tried to restart display-manager.service

sudo journalctl  -xe

shows:


-- The start-up result is done.
Dec 11 23:27:00 systemd-coredump[6199]: Process 6194 (sddm) of user 0 dumped
core.

                                               Stack trace of thread 6194:
                                               #0  0x00007fc10e230160 raise
(libc.so.6)
                                               #1  0x00007fc10e231741 abort
(libc.so.6)
                                               #2  0x00007fc10ebf8907
_ZNK14QMessageLogger5fatalEPKcz (libQt5Core.so.5)
                                               #3  0x000055b6af075718
_ZN4SDDM7Display5startEv (sddm)
                                               #4  0x000055b6af08ef7a
_ZN4SDDM4Seat13createDisplayEi (sddm)
                                               #5  0x000055b6af08f1e0
_ZN4SDDM4SeatC2ERK7QStringP7QObject (sddm)
                                               #6  0x000055b6af09117f
_ZN4SDDM11SeatManager10createSeatERK7QString (sddm)
                                               #7  0x000055b6af091fd0 n/a
(sddm)
                                               #8  0x00007fc10ee1b64f
_ZN11QMetaObject8activateEP7QObjectiiPPv (libQt5Core.so.5)
                                               #9  0x000055b6af09016f
_ZN4SDDM10LogindSeat19canGraphicalChangedEb (sddm)
                                               #10 0x000055b6af0902ee n/a
(sddm)
                                               #11 0x00007fc10ee1b64f
_ZN11QMetaObject8activateEP7QObjectiiPPv (libQt5Core.so.5)
                                               #12 0x00007fc10ff44dff
_ZN23QDBusPendingCallWatcher8finishedEPS_ (libQt5DBus.so.5)
                                               #13 0x00007fc10ee1c0a2
_ZN7QObject5eventEP6QEvent (libQt5Core.so.5)
                                               #14 0x00007fc10edec8c1
_ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5)
                                               #15 0x00007fc10edef04d
_ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData
(libQt5Core.so.5)
                                               #16 0x00007fc10ee46323 n/a
(libQt5Core.so.5)
                                               #17 0x00007fc10b22fe87
g_main_context_dispatch (libglib-2.0.so.0)
                                               #18 0x00007fc10b230230 n/a
(libglib-2.0.so.0)
                                               #19 0x00007fc10b2302bc
g_main_context_iteration (libglib-2.0.so.0)
                                               #20 0x00007fc10ee4594f
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt5Core.so.5)
                                               #21 0x00007fc10edea90a
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
                                               #22 0x00007fc10edf39b4
_ZN16QCoreApplication4execEv (libQt5Core.so.5)
                                               #23 0x000055b6af0555c7 main
(sddm)
                                               #24 0x00007fc10e21af8a
__libc_start_main (libc.so.6)
                                               #25 0x000055b6af0558aa _start
(sddm)

                                               Stack trace of thread 6195:
                                               #0  0x00007fc10e2e819b __poll
(libc.so.6)
                                               #1  0x00007fc10b2301a9 n/a
(libglib-2.0.so.0)
                                               #2  0x00007fc10b2302bc
g_main_context_iteration (libglib-2.0.so.0)
                                               #3  0x00007fc10ee4594f
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt5Core.so.5)
                                               #4  0x00007fc10edea90a
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5)
                                               #5  0x00007fc10ec08daa
_ZN7QThread4execEv (libQt5Core.so.5)
                                               #6  0x00007fc10feed9e5 n/a
(libQt5DBus.so.5)
                                               #7  0x00007fc10ec0dced n/a
(libQt5Core.so.5)
                                               #8  0x00007fc10dfe3569
start_thread (libpthread.so.0)
                                               #9  0x00007fc10e2f29ef __clone
(libc.so.6)
-- Subject: Process (sddm) dumped core

-- Process (sddm) crashed and dumped core.