It may be something as boring as purging caches.
Howard Miller
Posts made by Howard Miller
How is that any different from $cache->delete($keys) ? (from memory)
'oom'. You've run out of memory and the 'oom-killer' is trying to save the server by killing the process that it thinks caused the problem. You don't have enough RAM. Or you've configured stuff to try to use way more than you've got.
Define "crashed". What doesn't happen? What errors? What's in the log? Anything that might give a clue...