This bug is created as a clone of upstream ticket:
https://fedorahosted.org/sssd/ticket/1251

Dear SSSD team,

we are experiencing an issue with SSSD, where `sssd_be` is consuming a lot of memory. The RAM consumption grows continuously in a certain setup where a SFTP/SSH login happens every 30 seconds.

During a time period of 17 hours the memory usage of SSSD increased by 20% respectively 200MB (1024MB system memory).
After restarting SSSD the memory consumption goes back to normal.
\\The attached `debug log file` shows the login sequence of the mentioned SFTP user.

Since we don't have a large LDAP directory (~60 Unix users / ~20 Unix groups) I suppose we might have a misconfiguration in our `sssd.conf` (see attachments).

\\

When I remove the `cache` file of SSSD and run an `id` on 50 LDAP users the memory consumption grows only about ~5MB. The memory usage stays the same even when I run the `id` command over and over again (executed at least 20 times).
The commands `getent passwd` and `getent group` also do not increase the memory usage of SSSD.

\\

Information about the environment/system:
 * LDAP is ID and AUTH provider
 * LDAP schema is rfc2307bis
 * RHEL 6.2 / CentOS 6.2
 * sssd-client-1.5.1-66.el6_2.3.i686
 * sssd-1.5.1-66.el6_2.3.i686

Attachments:
 * sssd.conf (sanitized)
 * sssd_EXAMPLE.log (sanitized)
 * sssd_mem_usage.png (graph)

\\

If you need any further debug information please let me know.\\Many thanks for looking into this issue.

Kind regards,
mayak