The SSSD daemon (sssd_nss) uses an excessive amount of memory

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Issue

Today we had a system that was unresponsive after sssd had consumed 40% of the 2 GB of RAM
The only way to get the system back was to reboot it

Environment

Red Hat Enterprise Linux (RHEL) 6
System Security Services Daemon (SSSD) 1.9.2-82.10 (and earlier versions)

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