Comment # 6 on bug 1200239 from Samuel Cabrero

The assert is triggered in liblber, provided by openldap, when trying to chase
a LDAP referral.

The bug? was introduced in 2.4.48 by commit:

> commit 11320a9156e1306c251b27443439dc2e1db0107b
> Refs: OPENLDAP_REL_ENG_2_4_47-2-g11320a915
> Author:     Howard Chu <hyc@openldap.org>
> AuthorDate: Tue Jan 17 11:35:54 2017 +0000
> Commit:     Quanah Gibson-Mount <quanah@openldap.org>
> CommitDate: Thu Dec 20 04:26:56 2018 +0000
> 
>     ITS#8727 plug ber leaks

As a workaround you can disable LDAP referrals in the domain section of
sssd.conf:

> ldap_referrals = false