The update of libldb1 from 1.2.3-lp150.2.3.1 to 1.2.3-lp150.7.2 broke sssd.
Downgrade fixed it:

Apr 06 11:08:59 zoidberg sssd[1883]: ldb: module version mismatch in
../source4/dsdb/samdb/ldb_modules/acl.c : ldb_version=1.2.4
module_version=1.2.3
Apr 06 11:08:59 zoidberg sssd[1883]: ldb: failed to initialise module
/usr/lib64/ldb/samba/acl.so : Unavailable
Apr 06 11:08:59 zoidberg sssd[1883]: ldb: failed to initialise module
/usr/lib64/ldb/samba : Unavailable
Apr 06 11:08:59 zoidberg sssd[1883]: SSSD couldn't load the configuration
database [5]: Input/output error.

Bug ID	1131753
Summary	Update of libldb breaks sssd
Classification	openSUSE
Product	openSUSE Distribution
Version	Leap 15.0
Hardware	Other
OS	Other
Status	NEW
Severity	Normal
Priority	P5 - None
Component	Basesystem
Assignee	bnc-team-screening@forge.provo.novell.com
Reporter	gleixner@lrz.de
QA Contact	qa-bugs@suse.de
Found By	---
Blocker	---