SUMMARY

This may be a tricky one as I don't know exactly how to reproduce it. However, it has been happening for a good number of releases on my system and it is quite annoying as I loose all in-flight work when it happens.

Sometimes, when I launch an application (eg: kontact, KeePassXC, etc.), kwin_wayland crashes and my whole session and running programs are killed with it.

This is what I get in the logs:
```
nov 29 15:55:41 apinovo systemd[2488]: Started KeePassXC - Gestor de contraseñas.
nov 29 15:55:42 apinovo kded5[30347]: org.kde.plasma.appmenu: Got an error
nov 29 15:55:42 apinovo kded5[30347]: org.kde.plasma.appmenu: Got an error
nov 29 15:55:43 apinovo kded5[30347]: Registering ":1.22360/StatusNotifierItem" to system tray
nov 29 15:55:46 apinovo systemd-coredump[6958]: [🡕] Process 30073 (kwin_wayland) of user 1004 dumped core.
                                                
                                                Stack trace of thread 30655:
                                                #0  0x00007f12c4156874 _ZNK10QArrayData4dataEv (libQt5Core.so.5 + 0x356874)
                                                #1  0x00007f12c4156d47 _ZNK11QJsonObject9valueImplI11QStringViewEE10QJsonValueT_ (libQt5Core.so.5 + 0x356d47)
                                                #2  0x00007f12c4157187 _ZNK11QJsonObjectixE11QStringView (libQt5Core.so.5 + 0x357187)
                                                #3  0x00007f12c4b9105a _ZNK15KPluginMetaData10rootObjectEv (libKF5CoreAddons.so.5 + 0x6305a)
                                                #4  0x00007f12c4b914c6 _ZNK15KPluginMetaData8pluginIdEv (libKF5CoreAddons.so.5 + 0x634c6)
                                                #5  0x00007f12c4b8e95b _ZNK15KPluginMetaData7isValidEv (libKF5CoreAddons.so.5 + 0x6095b)
                                                #6  0x00007f12745d8047 _ZNK6Plasma14AbstractRunner4nameEv (libKF5Runner.so.5 + 0x16047)
                                                #7  0x00007f12745e36d7 n/a (libKF5Runner.so.5 + 0x216d7)
                                                #8  0x00007f1273fe8fdb n/a (libKF5ThreadWeaver.so.5 + 0x13fdb)
                                                #9  0x00007f1273fec16c _ZN12ThreadWeaver3Job10defaultEndERK14QSharedPointerINS_12JobInterfaceEEPNS_6ThreadE (libKF5ThreadWeaver.so.5 + 0x1716c)
                                                #10 0x00007f1273fec0df _ZN12ThreadWeaver3Job7executeERK14QSharedPointerINS_12JobInterfaceEEPNS_6ThreadE (libKF5ThreadWeaver.so.5 + 0x170df)
                                                #11 0x00007f1273fefa68 _ZN12ThreadWeaver6Thread3runEv (libKF5ThreadWeaver.so.5 + 0x1aa68)
                                                #12 0x00007f12c3ef5e3d _ZN14QThreadPrivate5startEPv (libQt5Core.so.5 + 0xf5e3d)
                                                #13 0x00007f12c309398d start_thread (libc.so.6 + 0x8e98d)
                                                #14 0x00007f12c311a380 __clone3 (libc.so.6 + 0x115380)
                                                
                                                Stack trace of thread 30123:
                                                #0  0x00007f12c3090006 __futex_abstimed_wait_common (libc.so.6 + 0x8b006)
                                                #1  0x00007f12c3092cd0 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x8dcd0)
                                                #2  0x00007f12b64baa5b n/a (iris_dri.so + 0xbaa5b)
                                                #3  0x00007f12b6503f27 n/a (iris_dri.so + 0x103f27)
                                                #4  0x00007f12c309398d start_thread (libc.so.6 + 0x8e98d)
                                                #5  0x00007f12c311a380 __clone3 (libc.so.6 + 0x115380)
                                                
                                                Stack trace of thread 30126:
                                                #0  0x00007f12c310bb7f __poll (libc.so.6 + 0x106b7f)
                                                #1  0x00007f12c1c6adbe n/a (libglib-2.0.so.0 + 0x58dbe)
                                                #2  0x00007f12c1c6aedc g_main_context_iteration (libglib-2.0.so.0 + 0x58edc)
                                                #3  0x00007f12c4133b56 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x333b56)
                                                #4  0x00007f12c40dab9b _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2dab9b)
                                                #5  0x00007f12c3ef4c47 _ZN7QThread4execEv (libQt5Core.so.5 + 0xf4c47)
                                                #6  0x00007f12c3ef5e3d _ZN14QThreadPrivate5startEPv (libQt5Core.so.5 + 0xf5e3d)
                                                #7  0x00007f12c309398d start_thread (libc.so.6 + 0x8e98d)
                                                #8  0x00007f12c311a380 __clone3 (libc.so.6 + 0x115380)
[...] (plus more threads in either __poll or some *wait... and then the apps complaining about the compositor dying)
nov 29 15:55:46 apinovo kmozillahelper[6377]: The Wayland connection broke. Did the Wayland compositor die?
nov 29 15:55:46 apinovo firefox[6269]: Error reading events from display: Conexión reinicializada por la máquina remota
nov 29 15:55:46 apinovo xdg-desktop-portal-kde[31800]: The Wayland connection broke. Did the Wayland compositor die?
nov 29 15:55:46 apinovo klauncher[31024]: The Wayland connection broke. Did the Wayland compositor die?
nov 29 15:55:46 apinovo baloorunner[30678]: The Wayland connection broke. Did the Wayland compositor die?
nov 29 15:55:46 apinovo kiod5[31071]: The Wayland connection broke. Did the Wayland compositor die?
nov 29 15:55:46 apinovo kwalletmanager5[31034]: The Wayland connection broke. Did the Wayland compositor die?
nov 29 15:55:46 apinovo kwalletd5[30866]: The Wayland connection broke. Did the Wayland compositor die?
nov 29 15:55:46 apinovo kwalletd5[30866]: The Wayland connection broke. Did the Wayland compositor die?
nov 29 15:55:46 apinovo keepassxc[6929]: The Wayland connection broke. Did the Wayland compositor die?
nov 29 15:55:46 apinovo keepassxc[6929]: The Wayland connection broke. Did the Wayland compositor die?
nov 29 15:55:46 apinovo akonadi_newmailnotifier_agent[30576]: The Wayland connection broke. Did the Wayland compositor die?
[...]
```


STEPS TO REPRODUCE
1. Launch an application (sometimes)
2. The crash happens right after

OBSERVED RESULT
- A core dump is triggered for kwin_wayland process
- Screen goes dark and all applications get killed
- Then session is automatically restarted

EXPECTED RESULT
- No crash
- If kwin crashes, I would expect my running apps to survive kwin restarts as they did before I moved to systemd based user session management.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: OpenSUSE Tumbleweed
(available in About System)
KDE Plasma Version:  5.26.3
KDE Frameworks Version: 5.26.3
Qt Version: 5.15.7

ADDITIONAL INFORMATION