Creating BZ based on upstream pull request/tracker:
ObjectCacheInfo::time_added is only initialized on first insert. so once an entry reaches its rgw_cache_expiry_interval, it can't be refreshed until the lru removes its entry entirely
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.