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Since these are socket file descriptors, it looks like rosout has a lot of open sockets. ROS creates a socket for each connection between a publisher and a subscriber, so there can be a lot of file descriptors involved, but even on robots with hundreds of nodes this isn't usually a problem.

You may be able to tell what these open sockets are connected to and what state they're in with netstat -lp. The -l option lists open sockets, and the -p option lists the process that owns that socket.