Comment 1 for bug 1578401

I'll look into this a little deeper, but from the information provided it doesn't sound like there is an issue. The 'stats cachedump' command will often, and maybe even likely, show things that are expired. memcache won't actually delete the item from memory until you access it again and it decides that it's expired or if it's trying to make room for new entries. In the new entries case I'm not sure if you'd see if as an eviction because the data wasn't forced out.

You can tell if an item has no expiration pretty easily if it's expiration is equal to 'time - uptime' where time and uptime can be found in the stats output.