Hey!
Got a strange log from outer space, on a middle relay... :s
[log] Jul 17 04:31:24.000 [warn] Received http status code 504 ("Gateway Time-out") from server '154.35.175.225:80' while fetching "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z". I'll try again soon. [/log]
Tor version 0.3.0.9 (git-100816d92ab5664d) on a Debian 8 Jessie.
I don't remember seeing this before !
If it can help...