This bug has been copied from bug #511238 and has been proposed
to be backported to 5.5 z-stream (EUS).
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.
When using pluggable authentication modules (PAM), selected modules can be loaded and unloaded upon each authentication attempt. However, unloading the pam_ldap module could cause the memory that is allocated by libraries on which it depends to be lost. Consequent to this, multiple authentication attempts may have led to a significant memory loss. To prevent this, the pam_ldap module is no longer unloaded.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.