Issue

Lookups performed for some AD users from IPA client is failing with the error : "ipa_get_*_acct request failed: [12]: Cannot allocate memory".
Other AD user lookups works.

Noticed the following errors in SSSD debug logs :

[sssd[be[ipa.example.com]]] [get_group_dn_list] (0x0040): find_domain_by_object_name failed.
[sssd[be[ipa.example.com]]] [ipa_s2n_get_user_done] (0x0040): get_group_dn_list failed.
[sssd[be[ipa.example.com]]] [sdap_id_op_done] (0x4000): releasing operation connection
[sssd[be[ipa.example.com]]] [ipa_subdomain_account_done] (0x0040): ipa_get_*_acct request failed: [12]: Cannot allocate memory.
[sssd[be[ipa.example.com]]] [sdap_id_op_destroy] (0x4000): releasing operation connection
[sssd[be[ipa.example.com]]] [acctinfo_callback] (0x0100): Request processed. Returned 3,12,Out of memory


-----snip ----
var/log/sssd/sssd_nss.log
[sssd[nss]] [sss_dp_get_reply] (0x1000): Got reply from Data Provider - DP error code: 3 errno: 12 error message: Out of memory