I placed a repeating command block (facing up) with no command in
On top of that one, a chain command block (facing up) with a /clone ~ ~ ~ ~ ~ ~ ~ ~1 ~
Then i placed a lever on the bottom one, and activated it, it powered both the chain and the repeating command block, and the structure started copying itself upwards, but after a couple of seconds, i got kicked from the server (private server with 2 players), and after a while the server crashed

Client kick message:
https://gyazo.com/b6c828a00af739fe6a4b0e7398fb2f57
Server crash report:
http://pastebin.com/gRngDUDr