Hi,
There were few cases where SSSD seems to stop working and required restart when the server's load average gets high ~ 80 on 24threads(processors) platform.
Running 6.5 centos with 1.9.2-129 x86_64
On 6.5,
sssd_nss.log shows the following:
Thu Jul 31 20:28:38 2014) [sssd[nss]] [sss_dp_init] (0x0010): Failed to connect to monitor services.
(Thu Jul 31 20:28:38 2014) [sssd[nss]] [sss_process_init] (0x0010): fatal error setting up backend connector
(Thu Jul 31 20:30:19 2014) [sssd[nss]] [nss_dp_reconnect_init] (0x0010): Could not reconnect to LDAP provider.
(Thu Jul 31 20:44:16 2014) [sssd[nss]] [nss_dp_reconnect_init] (0x0010): Could not reconnect to LDAP provider.
(Thu Jul 31 20:44:46 2014) [sssd[nss]] [nss_dp_reconnect_init] (0x0010): Could not reconnect to LDAP provider.
(Thu Jul 31 20:45:16 2014) [sssd[nss]] [nss_dp_reconnect_init] (0x0010): Could not reconnect to LDAP provider.
(Thu Jul 31 20:45:46 2014) [sssd[nss]] [nss_dp_reconnect_init] (0x0010): Could not reconnect to LDAP provider.
Fri Aug 1 19:55:18 2014) [sssd[nss]] [nss_dp_reconnect_init] (0x0010): Could not reconnect to LDAP provider.
(Fri Aug 1 19:55:48 2014) [sssd[nss]] [nss_dp_reconnect_init] (0x0010): Could not reconnect to LDAP provider.
(Fri Aug 1 19:56:18 2014) [sssd[nss]] [nss_dp_reconnect_init] (0x0010): Could not reconnect to LDAP provider.