Comment # 26 on bug 1131686 from Manfred Hupfer

This bug is now back with openSUSE 15.3 and a version mismatch between ldb2
2.4.2 and 2.4.1:

Mai 14 18:41:17 yagi sssd[6425]: ldb: module version mismatch in
../../source4/dsdb/samdb/ldb_modules/acl.c : ldb_version=2.4.2
module_version=2.4.1
Mai 14 18:41:17 yagi sssd[6425]: ldb: failed to initialise module
/usr/lib64/ldb2/modules/ldb/samba/acl.so : Unavailable
Mai 14 18:41:17 yagi sssd[6425]: ldb: failed to initialise module
/usr/lib64/ldb2/modules/ldb/samba : Unavailable
Mai 14 18:41:17 yagi sssd[6425]: SSSD couldn't load the configuration database
[5]: Input/output error.
Mai 14 18:41:17 yagi systemd[1]: sssd.service: Main process exited,
code=exited, status=4/NOPERMISSION

As mentioned in the forum, it goes away when uninstalling the package
"samba-dsdb-modules" which is a dependency for package "samba-ad-dc". 

Also the workaround of deleting the symlink "/usr/lib64/ldb/samba" mentioned by
user ameijeiras back in 2019 still works.