Saslauthd constantly increasing memory use, solved by enabling caching. Why?

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Hi - On RHEL 6, with the latest updates, I have SASLAUTHD configured to use PAM authentication. I'm also running SSSD. U sing this configuration, the SASLAUTHD processes would gradually increase memory usage. After running for several days, each process was using up about 680M. Are there any known memory leaks when using PAM? I've found posts on the web from people complaining about PAM memory leaks, but am not sure they still exists. In any event, I'm also experiencing that about once a week, SASLAUTHD starts recording time out errors when trying to contact SSSD, i.e. "pam_sss(imap:auth): Request to sssd failed. Timer expired." I decided to enable SASLAUTHD caching with the -c flag, and was surprised to discover that the SASLAUTHD processes no longer use up significant memory (i.e. they are now using < 10M)! Can anyone explain this behavior? Thanks. - Mark

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