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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/sssd/ticket/1730

a user in the #sssd channel reported a valgrind output that led me to find out a glaring memory leak in the new feature we introduced to clean up the mem cache on initgroups calls.

To reproduce, set up a large group. Start the sssd and note the sssd_nss memory consumption.

Then run:
for i in `getent group $largegroup | tr ',' ' '`; do id $i; done

And watch the memory consumption grow gradually.

Verified in version 1.9.2-74

Memory consumption on id lookup of every 1000 users in KB is:
After first 1000: 17124
Next 1000       : 23320
Next 1000       : 18860
Next 1000       : 17640
Next 1000       : 20996

Overall 3MB increase in memory consumption.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-0508.html