I'm trying to hunt down the source of some sleeping processes in MySql. After doing some tracing, I'm seeing the following: Further down the trace

Hi everyone! I'm trying to hunt down the source of some sleeping processes in MySql. After doing some tracing, I'm seeing the following: Further down the trace, it looks like it's performing some nanosleep causing these processes to hang around. It's my understanding that when in maintenance mode, this file gets created but it is not there when the app is not in maintenance mode. Has anyone experienced this?
Sorry, this is what I'm seeing in the logs! :
access("/path/to/my/release/storage/framework/down", F_OK) = -1 ENOENT (No such file or directory)