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[Bug 61891] New: infinitive loop of AH01323: Purge of LDAP cache failed


https://bz.apache.org/bugzilla/show_bug.cgi?id=61891

            Bug ID: 61891
           Summary: infinitive loop of AH01323: Purge of LDAP cache failed
           Product: Apache httpd-2
           Version: 2.4.27
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_ldap
          Assignee: bugs@xxxxxxxxxxxxxxxx
          Reporter: hendrik.harms@xxxxxxxxx
  Target Milestone: ---

Sometimes I see the error "AH01323: Purge of LDAP cache failed" repeated many
times. Only restarting the HTTPD could stop it.

After some investigation I think the marktime set when the cache is 3/4 full is
the problem: 
If we have a cache with a short TTL-time many entries are renewed before the
maxentries are reached. If the purge-run could only delete less than 1/4 of the
entries (cause more than 1/2 are renewed meanwhile) we don't pass the place
where the marktime is set again. After this we could not add any new item into
the cache. Any try to add an item will cause the error "AH01323: Purge of LDAP
cache failed".

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