It sounds like they are describing an open file descriptor limit being hit when the app is not set to use local UI for that add-on. It would just be a little b

It sounds like they are describing an open file descriptor limit being hit when the app is not set to use local UI for that add-on. It would just be a little burst of CPU and then things would hang. Both sysctl and pam limits could be increased to see if it buys more time to see the problem with lsof and other counters. Or perhaps the app could be run in a cgroup / namespace with artificially lower limits to break it faster without hanging the console or SSH so that one could see how many descriptors are open.